diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 9a3e14c..7fedd29 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -25,7 +25,7 @@ permissions:
 
 jobs:
   lint:
-    name: Clippy & Rustfmt
+    name: Clippy, Rustfmt, Tests
     runs-on: ubuntu-24.04
     steps:
       - name: Checkout repository
@@ -54,9 +54,13 @@ jobs:
       - name: Run rustfmt
         run: cargo fmt --all -- --check
 
+      - name: Unit tests
+        run: cargo test
+
   build:
     name: Linux-x64 build
     needs: lint
+    # using an older Ubuntu release on purpose to link against an older libc version for greater compatibility
     runs-on: ubuntu-22.04
     steps:
       - name: Checkout repository
@@ -93,7 +97,7 @@ jobs:
 
       - name: Release build
         shell: bash
-        run: cargo build --release
+        run: cargo build --release --bins --all-features
 
       # Archive is required to preserve file permissions and re-used for release uploads
       - name: Create upload artifact
@@ -102,8 +106,9 @@ jobs:
           ls -la target/release
           mkdir -p ${GITHUB_WORKSPACE}/${{env.BIN_OUTPUT_PATH }}
           cp target/release/${{ env.APP_NAME }} ${GITHUB_WORKSPACE}/${{ env.BIN_OUTPUT_PATH }}
+          cp target/release/sysinfo ${GITHUB_WORKSPACE}/${{ env.BIN_OUTPUT_PATH }}
           cp linux/*.service ${GITHUB_WORKSPACE}/${{ env.BIN_OUTPUT_PATH }}
-          cp Monitor3.json ${GITHUB_WORKSPACE}/${{ env.BIN_OUTPUT_PATH }}
+          cp -r cfg ${GITHUB_WORKSPACE}/${{ env.BIN_OUTPUT_PATH }}
           echo "VERSION=${{ env.APP_VERSION }}" > ${GITHUB_WORKSPACE}/${{ env.BIN_OUTPUT_PATH }}/version.txt
           echo "TIMESTAMP=$(date +"%Y%m%d_%H%M%S")" >> ${GITHUB_WORKSPACE}/${{ env.BIN_OUTPUT_PATH }}/version.txt
           tar czvf ${{ env.ARTIFACT_NAME }}.tar.gz -C ${GITHUB_WORKSPACE}/${{ env.BIN_OUTPUT_PATH }} .
diff --git a/.idea/runConfigurations/Run_demo.xml b/.idea/runConfigurations/Run_demo.xml
index 1a7cfcd..6eeb8af 100644
--- a/.idea/runConfigurations/Run_demo.xml
+++ b/.idea/runConfigurations/Run_demo.xml
@@ -1,7 +1,7 @@
 <component name="ProjectRunConfigurationManager">
   <configuration default="false" name="Run demo" type="CargoCommandRunConfiguration" factoryName="Cargo Command">
     <option name="buildProfileId" value="dev" />
-    <option name="command" value="run --package AOOstar-rs --bin AOOstar-rs -- --demo -d /dev/cu.usbserial-AB0KOHLS -w -c Monitor3.json" />
+    <option name="command" value="run --package aoostar-rs --bin asterctl -- --demo -c monitor.json" />
     <option name="workingDirectory" value="file://$PROJECT_DIR$" />
     <envs />
     <option name="emulateTerminal" value="true" />
diff --git a/.idea/runConfigurations/Run_demo_DEV.xml b/.idea/runConfigurations/Run_demo_DEV.xml
new file mode 100644
index 0000000..a907063
--- /dev/null
+++ b/.idea/runConfigurations/Run_demo_DEV.xml
@@ -0,0 +1,20 @@
+<component name="ProjectRunConfigurationManager">
+  <configuration default="false" name="Run demo DEV" type="CargoCommandRunConfiguration" factoryName="Cargo Command">
+    <option name="buildProfileId" value="release" />
+    <option name="command" value="run --package aoostar-rs --bin asterctl -- --demo -c monitor.json --save --simulate" />
+    <option name="workingDirectory" value="file://$PROJECT_DIR$" />
+    <envs />
+    <option name="emulateTerminal" value="true" />
+    <option name="channel" value="DEFAULT" />
+    <option name="requiredFeatures" value="true" />
+    <option name="allFeatures" value="false" />
+    <option name="withSudo" value="false" />
+    <option name="buildTarget" value="REMOTE" />
+    <option name="backtrace" value="SHORT" />
+    <option name="isRedirectInput" value="false" />
+    <option name="redirectInputPath" value="" />
+    <method v="2">
+      <option name="CARGO.BUILD_TASK_PROVIDER" enabled="true" />
+    </method>
+  </configuration>
+</component>
\ No newline at end of file
diff --git a/.idea/runConfigurations/Run_release_demo.xml b/.idea/runConfigurations/Run_sensor_panel.xml
similarity index 74%
rename from .idea/runConfigurations/Run_release_demo.xml
rename to .idea/runConfigurations/Run_sensor_panel.xml
index baf8ca9..981ccf9 100644
--- a/.idea/runConfigurations/Run_release_demo.xml
+++ b/.idea/runConfigurations/Run_sensor_panel.xml
@@ -1,7 +1,7 @@
 <component name="ProjectRunConfigurationManager">
-  <configuration default="false" name="Run release demo" type="CargoCommandRunConfiguration" factoryName="Cargo Command">
-    <option name="buildProfileId" value="release" />
-    <option name="command" value="run --package AOOstar-rs --bin AOOstar-rs -- --demo -d /dev/cu.usbserial-AB0KOHLS -w -c Monitor3.json" />
+  <configuration default="false" name="Run sensor panel" type="CargoCommandRunConfiguration" factoryName="Cargo Command">
+    <option name="buildProfileId" value="dev" />
+    <option name="command" value="run --package aoostar-rs --bin asterctl -- -c monitor.json" />
     <option name="workingDirectory" value="file://$PROJECT_DIR$" />
     <envs />
     <option name="emulateTerminal" value="true" />
diff --git a/.idea/runConfigurations/Run_sensor_panel_DEV.xml b/.idea/runConfigurations/Run_sensor_panel_DEV.xml
new file mode 100644
index 0000000..18429cb
--- /dev/null
+++ b/.idea/runConfigurations/Run_sensor_panel_DEV.xml
@@ -0,0 +1,20 @@
+<component name="ProjectRunConfigurationManager">
+  <configuration default="false" name="Run sensor panel DEV" type="CargoCommandRunConfiguration" factoryName="Cargo Command">
+    <option name="buildProfileId" value="dev" />
+    <option name="command" value="run --package aoostar-rs --bin asterctl -- -c monitor.json --save --simulate" />
+    <option name="workingDirectory" value="file://$PROJECT_DIR$" />
+    <envs />
+    <option name="emulateTerminal" value="true" />
+    <option name="channel" value="DEFAULT" />
+    <option name="requiredFeatures" value="true" />
+    <option name="allFeatures" value="false" />
+    <option name="withSudo" value="false" />
+    <option name="buildTarget" value="REMOTE" />
+    <option name="backtrace" value="SHORT" />
+    <option name="isRedirectInput" value="false" />
+    <option name="redirectInputPath" value="" />
+    <method v="2">
+      <option name="CARGO.BUILD_TASK_PROVIDER" enabled="true" />
+    </method>
+  </configuration>
+</component>
\ No newline at end of file
diff --git a/.idea/runConfigurations/Run_sysinfo.xml b/.idea/runConfigurations/Run_sysinfo.xml
new file mode 100644
index 0000000..d9edb39
--- /dev/null
+++ b/.idea/runConfigurations/Run_sysinfo.xml
@@ -0,0 +1,20 @@
+<component name="ProjectRunConfigurationManager">
+  <configuration default="false" name="Run sysinfo" type="CargoCommandRunConfiguration" factoryName="Cargo Command">
+    <option name="buildProfileId" value="dev" />
+    <option name="command" value="run --package aoostar-rs --bin sysinfo -- --console --out ./cfg/sensors/sysinfo.txt" />
+    <option name="workingDirectory" value="file://$PROJECT_DIR$" />
+    <envs />
+    <option name="emulateTerminal" value="true" />
+    <option name="channel" value="DEFAULT" />
+    <option name="requiredFeatures" value="true" />
+    <option name="allFeatures" value="false" />
+    <option name="withSudo" value="false" />
+    <option name="buildTarget" value="REMOTE" />
+    <option name="backtrace" value="SHORT" />
+    <option name="isRedirectInput" value="false" />
+    <option name="redirectInputPath" value="" />
+    <method v="2">
+      <option name="CARGO.BUILD_TASK_PROVIDER" enabled="true" />
+    </method>
+  </configuration>
+</component>
\ No newline at end of file
diff --git a/.idea/runConfigurations/Run_sysinfo_repeat.xml b/.idea/runConfigurations/Run_sysinfo_repeat.xml
new file mode 100644
index 0000000..0c2c5f9
--- /dev/null
+++ b/.idea/runConfigurations/Run_sysinfo_repeat.xml
@@ -0,0 +1,20 @@
+<component name="ProjectRunConfigurationManager">
+  <configuration default="false" name="Run sysinfo repeat" type="CargoCommandRunConfiguration" factoryName="Cargo Command">
+    <option name="buildProfileId" value="dev" />
+    <option name="command" value="run --package aoostar-rs --bin sysinfo -- --console --out ./cfg/sensors/sysinfo.txt --refresh 3" />
+    <option name="workingDirectory" value="file://$PROJECT_DIR$" />
+    <envs />
+    <option name="emulateTerminal" value="true" />
+    <option name="channel" value="DEFAULT" />
+    <option name="requiredFeatures" value="true" />
+    <option name="allFeatures" value="false" />
+    <option name="withSudo" value="false" />
+    <option name="buildTarget" value="REMOTE" />
+    <option name="backtrace" value="SHORT" />
+    <option name="isRedirectInput" value="false" />
+    <option name="redirectInputPath" value="" />
+    <method v="2">
+      <option name="CARGO.BUILD_TASK_PROVIDER" enabled="true" />
+    </method>
+  </configuration>
+</component>
\ No newline at end of file
diff --git a/.idea/runConfigurations/clippy_sysinfo.xml b/.idea/runConfigurations/clippy_sysinfo.xml
new file mode 100644
index 0000000..7e17347
--- /dev/null
+++ b/.idea/runConfigurations/clippy_sysinfo.xml
@@ -0,0 +1,19 @@
+<component name="ProjectRunConfigurationManager">
+  <configuration default="false" name="clippy sysinfo" type="CargoCommandRunConfiguration" factoryName="Cargo Command">
+    <option name="command" value="clippy --bin sysinfo --features=sysinfo" />
+    <option name="workingDirectory" value="file://$PROJECT_DIR$" />
+    <envs />
+    <option name="emulateTerminal" value="true" />
+    <option name="channel" value="DEFAULT" />
+    <option name="requiredFeatures" value="true" />
+    <option name="allFeatures" value="false" />
+    <option name="withSudo" value="false" />
+    <option name="buildTarget" value="REMOTE" />
+    <option name="backtrace" value="SHORT" />
+    <option name="isRedirectInput" value="false" />
+    <option name="redirectInputPath" value="" />
+    <method v="2">
+      <option name="CARGO.BUILD_TASK_PROVIDER" enabled="true" />
+    </method>
+  </configuration>
+</component>
\ No newline at end of file
diff --git a/.idea/vcs.xml b/.idea/vcs.xml
index 94a25f7..029a1a8 100644
--- a/.idea/vcs.xml
+++ b/.idea/vcs.xml
@@ -1,5 +1,12 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
+  <component name="CommitMessageInspectionProfile">
+    <profile version="1.0">
+      <inspection_tool class="BodyLimit" enabled="true" level="WARNING" enabled_by_default="true" />
+      <inspection_tool class="SubjectBodySeparation" enabled="true" level="WARNING" enabled_by_default="true" />
+      <inspection_tool class="SubjectLimit" enabled="true" level="WARNING" enabled_by_default="true" />
+    </profile>
+  </component>
   <component name="VcsDirectoryMappings">
     <mapping directory="$PROJECT_DIR$" vcs="Git" />
   </component>
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 67a5824..a482e78 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 _Changes in the next release_
 
+### Added
+- Simple sensor panel with a file-based data source (#6) 
+
 ---
 
 ## v0.1.0 - 2025-08-02
diff --git a/Cargo.lock b/Cargo.lock
index 7b4b979..5774350 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -14,9 +14,9 @@ dependencies = [
 
 [[package]]
 name = "ab_glyph_rasterizer"
-version = "0.1.9"
+version = "0.1.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b2187590a23ab1e3df8681afdf0987c48504d80291f002fcdb651f0ef5e25169"
+checksum = "366ffbaa4442f4684d91e2cd7c5ea7c4ed8add41959a31447066e279e432b618"
 
 [[package]]
 name = "adler2"
@@ -44,9 +44,9 @@ dependencies = [
 
 [[package]]
 name = "anstream"
-version = "0.6.19"
+version = "0.6.20"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "301af1932e46185686725e0fad2f8f2aa7da69dd70bf6ecc44d6b703844a3933"
+checksum = "3ae563653d1938f79b1ab1b5e668c87c76a9930414574a6583a7b7e11a8e6192"
 dependencies = [
  "anstyle",
  "anstyle-parse",
@@ -74,29 +74,29 @@ dependencies = [
 
 [[package]]
 name = "anstyle-query"
-version = "1.1.3"
+version = "1.1.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6c8bdeb6047d8983be085bab0ba1472e6dc604e7041dbf6fcd5e71523014fae9"
+checksum = "9e231f6134f61b71076a3eab506c379d4f36122f2af15a9ff04415ea4c3339e2"
 dependencies = [
- "windows-sys",
+ "windows-sys 0.60.2",
 ]
 
 [[package]]
 name = "anstyle-wincon"
-version = "3.0.9"
+version = "3.0.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "403f75924867bb1033c59fbf0797484329750cfbe3c4325cd33127941fabc882"
+checksum = "3e0633414522a32ffaac8ac6cc8f748e090c5717661fddeea04219e2344f5f2a"
 dependencies = [
  "anstyle",
  "once_cell_polyfill",
- "windows-sys",
+ "windows-sys 0.60.2",
 ]
 
 [[package]]
 name = "anyhow"
-version = "1.0.98"
+version = "1.0.99"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e16d2d3311acee920a9eb8d33b8cbc1787ce4a264e85f964c2404b969bdcd487"
+checksum = "b0674a1ddeecb70197781e945de4b3b8ffb61fa939a5597bcf48503737663100"
 
 [[package]]
 name = "aoostar-rs"
@@ -109,12 +109,18 @@ dependencies = [
  "env_logger",
  "image",
  "imageproc",
+ "itertools 0.14.0",
  "log",
+ "notify",
  "once_cell",
+ "regex",
+ "rstest",
  "serde",
  "serde_json",
  "serde_repr",
  "serialport",
+ "sysinfo",
+ "tempfile",
 ]
 
 [[package]]
@@ -128,9 +134,9 @@ dependencies = [
 
 [[package]]
 name = "arbitrary"
-version = "1.4.1"
+version = "1.4.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dde20b3d026af13f561bdd0f15edf01fc734f0dafcedbaf42bba506a9517f223"
+checksum = "c3d036a3c4ab069c7b410a2ce876bd74808d2d0888a82667669f8e783a898bf1"
 
 [[package]]
 name = "arg_enum_proc_macro"
@@ -171,9 +177,9 @@ dependencies = [
 
 [[package]]
 name = "avif-serialize"
-version = "0.8.5"
+version = "0.8.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2ea8ef51aced2b9191c08197f55450d830876d9933f8f48a429b354f1d496b42"
+checksum = "47c8fbc0f831f4519fe8b810b6a7a91410ec83031b8233f730a0480029f6a23f"
 dependencies = [
  "arrayvec",
 ]
@@ -192,9 +198,9 @@ checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
 
 [[package]]
 name = "bitflags"
-version = "2.9.1"
+version = "2.9.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1b8e56985ec62d17e9c1001dc89c88ecd7dc08e47eba5ec7c29c7b5eeecde967"
+checksum = "6a65b545ab31d687cff52899d4890855fec459eb6afe0da6417b8a18da87aa29"
 
 [[package]]
 name = "bitstream-io"
@@ -216,9 +222,9 @@ checksum = "46c5e41b57b8bba42a04676d81cb89e9ee8e859a1a66f80a5a72e1cb76b34d43"
 
 [[package]]
 name = "bytemuck"
-version = "1.23.1"
+version = "1.23.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5c76a5792e44e4abe34d3abf15636779261d45a7450612059293d1d2cfc63422"
+checksum = "3995eaeebcdf32f91f980d360f78732ddc061097ab4e39991ae7a6ace9194677"
 
 [[package]]
 name = "byteorder-lite"
@@ -234,9 +240,9 @@ checksum = "d71b6127be86fdcfddb610f7182ac57211d4b18a3e9c82eb2d17662f2227ad6a"
 
 [[package]]
 name = "cc"
-version = "1.2.31"
+version = "1.2.33"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c3a42d84bb6b69d3a8b3eaacf0d88f179e1929695e1ad012b6cf64d9caaa5fd2"
+checksum = "3ee0f8803222ba5a7e2777dd72ca451868909b1ac410621b676adf07280e9b5f"
 dependencies = [
  "jobserver",
  "libc",
@@ -255,15 +261,15 @@ dependencies = [
 
 [[package]]
 name = "cfg-if"
-version = "1.0.1"
+version = "1.0.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9555578bc9e57714c812a1f84e4fc5b4d21fcb063490c624de019f7464c91268"
+checksum = "2fd1289c04a9ea8cb22300a459a72a385d7c73d3259e2ed7dcb2af674838cfa9"
 
 [[package]]
 name = "clap"
-version = "4.5.42"
+version = "4.5.45"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ed87a9d530bb41a67537289bafcac159cb3ee28460e0a4571123d2a778a6a882"
+checksum = "1fc0e74a703892159f5ae7d3aac52c8e6c392f5ae5f359c70b5881d60aaac318"
 dependencies = [
  "clap_builder",
  "clap_derive",
@@ -271,9 +277,9 @@ dependencies = [
 
 [[package]]
 name = "clap_builder"
-version = "4.5.42"
+version = "4.5.44"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "64f4f3f3c77c94aff3c7e9aac9a2ca1974a5adf392a8bb751e827d6d127ab966"
+checksum = "b3e7f4214277f3c7aa526a59dd3fbe306a370daee1f8b7b8c987069cd8e888a8"
 dependencies = [
  "anstream",
  "anstyle",
@@ -283,9 +289,9 @@ dependencies = [
 
 [[package]]
 name = "clap_derive"
-version = "4.5.41"
+version = "4.5.45"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ef4f52386a59ca4c860f7393bcf8abd8dfd91ecccc0f774635ff68e92eeef491"
+checksum = "14cb31bb0a7d536caef2639baa7fad459e15c3144efefa6dbd1c84562c4739f6"
 dependencies = [
  "heck",
  "proc-macro2",
@@ -422,6 +428,16 @@ version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "877a4ace8713b0bcf2a4e7eec82529c029f1d0619886d18145fea96c3ffe5c0f"
 
+[[package]]
+name = "errno"
+version = "0.3.13"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "778e2ac28f6c47af28e4907f13ffd1e1ddbd400980a9abd7c8df189bf578a5ad"
+dependencies = [
+ "libc",
+ "windows-sys 0.60.2",
+]
+
 [[package]]
 name = "exr"
 version = "1.73.0"
@@ -437,6 +453,12 @@ dependencies = [
  "zune-inflate",
 ]
 
+[[package]]
+name = "fastrand"
+version = "2.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "37909eebbb50d72f9059c3b6d82c0463f2ff062c9e95845c43a6c9c0355411be"
+
 [[package]]
 name = "fdeflate"
 version = "0.3.7"
@@ -456,6 +478,58 @@ dependencies = [
  "miniz_oxide",
 ]
 
+[[package]]
+name = "fsevent-sys"
+version = "4.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "76ee7a02da4d231650c7cea31349b889be2f45ddb3ef3032d2ec8185f6313fd2"
+dependencies = [
+ "libc",
+]
+
+[[package]]
+name = "futures-core"
+version = "0.3.31"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "05f29059c0c2090612e8d742178b0580d2dc940c837851ad723096f87af6663e"
+
+[[package]]
+name = "futures-macro"
+version = "0.3.31"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "162ee34ebcb7c64a8abebc059ce0fee27c2262618d7b60ed8faf72fef13c3650"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "futures-task"
+version = "0.3.31"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f90f7dce0722e95104fcb095585910c0977252f286e354b5e3bd38902cd99988"
+
+[[package]]
+name = "futures-timer"
+version = "3.0.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f288b0a4f20f9a56b5d1da57e2227c661b7b16168e2f72365f57b63326e29b24"
+
+[[package]]
+name = "futures-util"
+version = "0.3.31"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9fa08315bb612088cc391249efdc3bc77536f16c91f6cf495e6fbe85b20a4a81"
+dependencies = [
+ "futures-core",
+ "futures-macro",
+ "futures-task",
+ "pin-project-lite",
+ "pin-utils",
+ "slab",
+]
+
 [[package]]
 name = "getrandom"
 version = "0.2.16"
@@ -491,6 +565,12 @@ dependencies = [
  "weezl",
 ]
 
+[[package]]
+name = "glob"
+version = "0.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0cc23270f6e1808e30a928bdc84dea0b9b4136a8bc82338574f23baf47bbd280"
+
 [[package]]
 name = "half"
 version = "2.6.0"
@@ -503,9 +583,9 @@ dependencies = [
 
 [[package]]
 name = "hashbrown"
-version = "0.15.4"
+version = "0.15.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5971ac85611da7067dbfcabef3c70ebb5606018acd9e2a3903a0da507521e0d5"
+checksum = "9229cfe53dfd69f0609a49f65461bd93001ea1ef889cd5529dd176593f5338a1"
 
 [[package]]
 name = "heck"
@@ -556,7 +636,7 @@ dependencies = [
  "approx",
  "getrandom 0.2.16",
  "image",
- "itertools",
+ "itertools 0.12.1",
  "nalgebra",
  "num",
  "rand",
@@ -579,6 +659,26 @@ dependencies = [
  "hashbrown",
 ]
 
+[[package]]
+name = "inotify"
+version = "0.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f37dccff2791ab604f9babef0ba14fbe0be30bd368dc541e2b08d07c8aa908f3"
+dependencies = [
+ "bitflags 2.9.2",
+ "inotify-sys",
+ "libc",
+]
+
+[[package]]
+name = "inotify-sys"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e05c02b5e89bff3b946cedeca278abc628fe811e604f027c45a8aa3cf793d0eb"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "interpolate_name"
 version = "0.2.4"
@@ -615,6 +715,15 @@ dependencies = [
  "either",
 ]
 
+[[package]]
+name = "itertools"
+version = "0.14.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2b192c782037fadd9cfa75548310488aabdbf3d2da73885b31bd0abd03351285"
+dependencies = [
+ "either",
+]
+
 [[package]]
 name = "itoa"
 version = "1.0.15"
@@ -671,6 +780,26 @@ dependencies = [
  "wasm-bindgen",
 ]
 
+[[package]]
+name = "kqueue"
+version = "1.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "eac30106d7dce88daf4a3fcb4879ea939476d5074a9b7ddd0fb97fa4bed5596a"
+dependencies = [
+ "kqueue-sys",
+ "libc",
+]
+
+[[package]]
+name = "kqueue-sys"
+version = "1.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ed9625ffda8729b85e45cf04090035ac368927b8cebc34898e7c120f52e4838b"
+dependencies = [
+ "bitflags 1.3.2",
+ "libc",
+]
+
 [[package]]
 name = "lebe"
 version = "0.5.2"
@@ -679,9 +808,9 @@ checksum = "03087c2bad5e1034e8cace5926dec053fb3790248370865f5117a7d0213354c8"
 
 [[package]]
 name = "libc"
-version = "0.2.174"
+version = "0.2.175"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1171693293099992e19cddea4e8b849964e9846f4acee11b3948bcc337be8776"
+checksum = "6a82ae493e598baaea5209805c49bbf2ea7de956d50d7da0da1164f9c6d28543"
 
 [[package]]
 name = "libfuzzer-sys"
@@ -719,6 +848,12 @@ dependencies = [
  "pkg-config",
 ]
 
+[[package]]
+name = "linux-raw-sys"
+version = "0.9.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cd945864f07fe9f5371a27ad7b52a172b4b499999f1d97574c9fa68373937e12"
+
 [[package]]
 name = "log"
 version = "0.4.27"
@@ -785,6 +920,18 @@ dependencies = [
  "simd-adler32",
 ]
 
+[[package]]
+name = "mio"
+version = "1.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "78bed444cc8a2160f01cbcf811ef18cac863ad68ae8ca62092e8db51d51c761c"
+dependencies = [
+ "libc",
+ "log",
+ "wasi 0.11.1+wasi-snapshot-preview1",
+ "windows-sys 0.59.0",
+]
+
 [[package]]
 name = "nalgebra"
 version = "0.32.6"
@@ -833,6 +980,39 @@ version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0676bb32a98c1a483ce53e500a81ad9c3d5b3f7c920c28c24e9cb0980d0b5bc8"
 
+[[package]]
+name = "notify"
+version = "8.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4d3d07927151ff8575b7087f245456e549fea62edf0ec4e565a5ee50c8402bc3"
+dependencies = [
+ "bitflags 2.9.2",
+ "fsevent-sys",
+ "inotify",
+ "kqueue",
+ "libc",
+ "log",
+ "mio",
+ "notify-types",
+ "walkdir",
+ "windows-sys 0.60.2",
+]
+
+[[package]]
+name = "notify-types"
+version = "2.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5e0826a989adedc2a244799e823aece04662b66609d96af8dff7ac6df9a8925d"
+
+[[package]]
+name = "ntapi"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e8a3895c6391c39d7fe7ebc444a87eb2991b2a0bc718fdabd071eec617fc68e4"
+dependencies = [
+ "winapi",
+]
+
 [[package]]
 name = "num"
 version = "0.4.3"
@@ -918,6 +1098,25 @@ dependencies = [
  "libm",
 ]
 
+[[package]]
+name = "objc2-core-foundation"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1c10c2894a6fed806ade6027bcd50662746363a9589d3ec9d9bef30a4e4bc166"
+dependencies = [
+ "bitflags 2.9.2",
+]
+
+[[package]]
+name = "objc2-io-kit"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "71c1c64d6120e51cd86033f67176b1cb66780c2efe34dec55176f77befd93c0a"
+dependencies = [
+ "libc",
+ "objc2-core-foundation",
+]
+
 [[package]]
 name = "once_cell"
 version = "1.21.3"
@@ -945,6 +1144,18 @@ version = "1.0.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "57c0d7b74b563b49d38dae00a0c37d4d6de9b432382b2892f0574ddcae73fd0a"
 
+[[package]]
+name = "pin-project-lite"
+version = "0.2.16"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3b3cff922bd51709b605d9ead9aa71031d81447142d828eb4a6eba76fe619f9b"
+
+[[package]]
+name = "pin-utils"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8b870d8c151b6f2fb93e84a13146138f05d02ed11c7e7c54f8826aaaf7c9f184"
+
 [[package]]
 name = "pkg-config"
 version = "0.3.32"
@@ -989,10 +1200,19 @@ dependencies = [
 ]
 
 [[package]]
-name = "proc-macro2"
-version = "1.0.95"
+name = "proc-macro-crate"
+version = "3.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "02b3e5e68a3a1a02aad3ec490a98007cbc13c37cbe84a3cd7b8e406d76e7f778"
+checksum = "edce586971a4dfaa28950c6f18ed55e0406c1ab88bbce2c6f6293a7aaba73d35"
+dependencies = [
+ "toml_edit",
+]
+
+[[package]]
+name = "proc-macro2"
+version = "1.0.101"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "89ae43fd86e4158d6db51ad8e2b80f313af9cc74f5c0e03ccb87de09998732de"
 dependencies = [
  "unicode-ident",
 ]
@@ -1100,7 +1320,7 @@ dependencies = [
  "built",
  "cfg-if",
  "interpolate_name",
- "itertools",
+ "itertools 0.12.1",
  "libc",
  "libfuzzer-sys",
  "log",
@@ -1144,9 +1364,9 @@ checksum = "60a357793950651c4ed0f3f52338f53b2f809f32d83a07f72909fa13e4c6c1e3"
 
 [[package]]
 name = "rayon"
-version = "1.10.0"
+version = "1.11.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b418a60154510ca1a002a752ca9714984e21e4241e804d32555251faf8b78ffa"
+checksum = "368f01d005bf8fd9b1206fb6fa653e6c4a81ceb1466406b81792d87c5677a58f"
 dependencies = [
  "either",
  "rayon-core",
@@ -1154,9 +1374,9 @@ dependencies = [
 
 [[package]]
 name = "rayon-core"
-version = "1.12.1"
+version = "1.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1465873a3dfdaa8ae7cb14b4383657caab0b3e8a0aa9ae8e04b044854c8dfce2"
+checksum = "22e18b0f0062d30d4230b2e85ff77fdfe4326feb054b9783a3460d8435c8ab91"
 dependencies = [
  "crossbeam-deque",
  "crossbeam-utils",
@@ -1191,6 +1411,12 @@ version = "0.8.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2b15c43186be67a4fd63bee50d0303afffcef381492ebe2c5d87f324e1b8815c"
 
+[[package]]
+name = "relative-path"
+version = "1.9.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ba39f3699c378cd8970968dcbff9c43159ea4cfbd88d43c00b22f2ef10a435d2"
+
 [[package]]
 name = "rgb"
 version = "0.8.52"
@@ -1198,10 +1424,61 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0c6a884d2998352bb4daf0183589aec883f16a6da1f4dde84d8e2e9a5409a1ce"
 
 [[package]]
-name = "rustversion"
-version = "1.0.21"
+name = "rstest"
+version = "0.26.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8a0d197bd2c9dc6e53b84da9556a69ba4cdfab8619eb41a8bd1cc2027a0f6b1d"
+checksum = "f5a3193c063baaa2a95a33f03035c8a72b83d97a54916055ba22d35ed3839d49"
+dependencies = [
+ "futures-timer",
+ "futures-util",
+ "rstest_macros",
+]
+
+[[package]]
+name = "rstest_macros"
+version = "0.26.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9c845311f0ff7951c5506121a9ad75aec44d083c31583b2ea5a30bcb0b0abba0"
+dependencies = [
+ "cfg-if",
+ "glob",
+ "proc-macro-crate",
+ "proc-macro2",
+ "quote",
+ "regex",
+ "relative-path",
+ "rustc_version",
+ "syn",
+ "unicode-ident",
+]
+
+[[package]]
+name = "rustc_version"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cfcb3a22ef46e85b45de6ee7e79d063319ebb6594faafcf1c225ea92ab6e9b92"
+dependencies = [
+ "semver",
+]
+
+[[package]]
+name = "rustix"
+version = "1.0.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "11181fbabf243db407ef8df94a6ce0b2f9a733bd8be4ad02b4eda9602296cac8"
+dependencies = [
+ "bitflags 2.9.2",
+ "errno",
+ "libc",
+ "linux-raw-sys",
+ "windows-sys 0.60.2",
+]
+
+[[package]]
+name = "rustversion"
+version = "1.0.22"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b39cdef0fa800fc44525c84ccb54a029961a8215f9619753635a9c0d2538d46d"
 
 [[package]]
 name = "ryu"
@@ -1218,12 +1495,27 @@ dependencies = [
  "bytemuck",
 ]
 
+[[package]]
+name = "same-file"
+version = "1.0.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "93fc1dc3aaa9bfed95e02e6eadabb4baf7e3078b0bd1b4d7b6b0b68378900502"
+dependencies = [
+ "winapi-util",
+]
+
 [[package]]
 name = "scopeguard"
 version = "1.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "94143f37725109f92c262ed2cf5e59bce7498c01bcc1502d7b9afe439a4e9f49"
 
+[[package]]
+name = "semver"
+version = "1.0.26"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "56e6fa9c48d24d85fb3de5ad847117517440f6beceb7798af16b4a87d616b8d0"
+
 [[package]]
 name = "serde"
 version = "1.0.219"
@@ -1246,9 +1538,9 @@ dependencies = [
 
 [[package]]
 name = "serde_json"
-version = "1.0.142"
+version = "1.0.143"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "030fedb782600dcbd6f02d479bf0d817ac3bb40d644745b769d6a96bc3afc5a7"
+checksum = "d401abef1d108fbd9cbaebc3e46611f4b1021f714a0597a71f41ee463f5f4a5a"
 dependencies = [
  "itoa",
  "memchr",
@@ -1282,7 +1574,7 @@ version = "4.7.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cdb0bc984f6af6ef8bab54e6cf2071579ee75b9286aa9f2319a0d220c28b0a2b"
 dependencies = [
- "bitflags 2.9.1",
+ "bitflags 2.9.2",
  "cfg-if",
  "core-foundation",
  "core-foundation-sys",
@@ -1329,6 +1621,12 @@ dependencies = [
  "quote",
 ]
 
+[[package]]
+name = "slab"
+version = "0.4.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7a2ae44ef20feb57a68b23d846850f861394c2e02dc425a50098ae8c90267589"
+
 [[package]]
 name = "smallvec"
 version = "1.15.1"
@@ -1343,15 +1641,29 @@ checksum = "7da8b5736845d9f2fcb837ea5d9e2628564b3b043a70948a3f0b778838c5fb4f"
 
 [[package]]
 name = "syn"
-version = "2.0.104"
+version = "2.0.106"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "17b6f705963418cdb9927482fa304bc562ece2fdd4f616084c50b7023b435a40"
+checksum = "ede7c438028d4436d71104916910f5bb611972c5cfd7f89b8300a8186e6fada6"
 dependencies = [
  "proc-macro2",
  "quote",
  "unicode-ident",
 ]
 
+[[package]]
+name = "sysinfo"
+version = "0.37.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "07cec4dc2d2e357ca1e610cfb07de2fa7a10fc3e9fe89f72545f3d244ea87753"
+dependencies = [
+ "libc",
+ "memchr",
+ "ntapi",
+ "objc2-core-foundation",
+ "objc2-io-kit",
+ "windows",
+]
+
 [[package]]
 name = "system-deps"
 version = "6.2.2"
@@ -1371,6 +1683,19 @@ version = "0.12.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "61c41af27dd6d1e27b1b16b489db798443478cef1f06a660c96db617ba5de3b1"
 
+[[package]]
+name = "tempfile"
+version = "3.21.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "15b61f8f20e3a6f7e0649d825294eaf317edce30f82cf6026e7e4cb9222a7d1e"
+dependencies = [
+ "fastrand",
+ "getrandom 0.3.3",
+ "once_cell",
+ "rustix",
+ "windows-sys 0.60.2",
+]
+
 [[package]]
 name = "thiserror"
 version = "1.0.69"
@@ -1382,11 +1707,11 @@ dependencies = [
 
 [[package]]
 name = "thiserror"
-version = "2.0.12"
+version = "2.0.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "567b8a2dae586314f7be2a752ec7474332959c6460e02bde30d702a66d488708"
+checksum = "3467d614147380f2e4e374161426ff399c91084acd2363eaf549172b3d5e60c0"
 dependencies = [
- "thiserror-impl 2.0.12",
+ "thiserror-impl 2.0.16",
 ]
 
 [[package]]
@@ -1402,9 +1727,9 @@ dependencies = [
 
 [[package]]
 name = "thiserror-impl"
-version = "2.0.12"
+version = "2.0.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7f7cf42b4507d8ea322120659672cf1b9dbb93f8f2d4ecfd6e51350ff5b17a1d"
+checksum = "6c5e1be1c48b9172ee610da68fd9cd2770e7a4056cb3fc98710ee6906f0c7960"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -1474,7 +1799,7 @@ version = "0.1.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c01d12e3a56a4432a8b436f293c25f4808bdf9e9f9f98f9260bba1f1bc5a1f26"
 dependencies = [
- "thiserror 2.0.12",
+ "thiserror 2.0.16",
 ]
 
 [[package]]
@@ -1506,6 +1831,16 @@ version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "852e951cb7832cb45cb1169900d19760cfa39b82bc0ea9c0e5a14ae88411c98b"
 
+[[package]]
+name = "walkdir"
+version = "2.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "29790946404f91d9c5d06f9874efddea1dc06c5efe94541a7d6863108e3a5e4b"
+dependencies = [
+ "same-file",
+ "winapi-util",
+]
+
 [[package]]
 name = "wasi"
 version = "0.11.1+wasi-snapshot-preview1"
@@ -1611,19 +1946,139 @@ version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
 
+[[package]]
+name = "winapi-util"
+version = "0.1.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0978bf7171b3d90bac376700cb56d606feb40f251a475a5d6634613564460b22"
+dependencies = [
+ "windows-sys 0.60.2",
+]
+
 [[package]]
 name = "winapi-x86_64-pc-windows-gnu"
 version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
 
+[[package]]
+name = "windows"
+version = "0.61.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9babd3a767a4c1aef6900409f85f5d53ce2544ccdfaa86dad48c91782c6d6893"
+dependencies = [
+ "windows-collections",
+ "windows-core",
+ "windows-future",
+ "windows-link",
+ "windows-numerics",
+]
+
+[[package]]
+name = "windows-collections"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3beeceb5e5cfd9eb1d76b381630e82c4241ccd0d27f1a39ed41b2760b255c5e8"
+dependencies = [
+ "windows-core",
+]
+
+[[package]]
+name = "windows-core"
+version = "0.61.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c0fdd3ddb90610c7638aa2b3a3ab2904fb9e5cdbecc643ddb3647212781c4ae3"
+dependencies = [
+ "windows-implement",
+ "windows-interface",
+ "windows-link",
+ "windows-result",
+ "windows-strings",
+]
+
+[[package]]
+name = "windows-future"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fc6a41e98427b19fe4b73c550f060b59fa592d7d686537eebf9385621bfbad8e"
+dependencies = [
+ "windows-core",
+ "windows-link",
+ "windows-threading",
+]
+
+[[package]]
+name = "windows-implement"
+version = "0.60.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a47fddd13af08290e67f4acabf4b459f647552718f683a7b415d290ac744a836"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
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+dependencies = [
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+
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 checksum = "1e38bc4d79ed67fd075bcc251a1c39b32a1776bbe92e5bef1f0bf1f8c531853b"
 dependencies = [
- "windows-targets",
+ "windows-targets 0.52.6",
+]
+
+[[package]]
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+checksum = "f2f500e4d28234f72040990ec9d39e3a6b950f9f22d3dba18416c35882612bcb"
+dependencies = [
+ "windows-targets 0.53.3",
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@@ -1632,14 +2087,40 @@ version = "0.52.6"
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- "windows_i686_msvc",
- "windows_x86_64_gnu",
- "windows_x86_64_gnullvm",
- "windows_x86_64_msvc",
+ "windows_aarch64_gnullvm 0.52.6",
+ "windows_aarch64_msvc 0.52.6",
+ "windows_i686_gnu 0.52.6",
+ "windows_i686_gnullvm 0.52.6",
+ "windows_i686_msvc 0.52.6",
+ "windows_x86_64_gnu 0.52.6",
+ "windows_x86_64_gnullvm 0.52.6",
+ "windows_x86_64_msvc 0.52.6",
+]
+
+[[package]]
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+checksum = "d5fe6031c4041849d7c496a8ded650796e7b6ecc19df1a431c1a363342e5dc91"
+dependencies = [
+ "windows-link",
+ "windows_aarch64_gnullvm 0.53.0",
+ "windows_aarch64_msvc 0.53.0",
+ "windows_i686_gnu 0.53.0",
+ "windows_i686_gnullvm 0.53.0",
+ "windows_i686_msvc 0.53.0",
+ "windows_x86_64_gnu 0.53.0",
+ "windows_x86_64_gnullvm 0.53.0",
+ "windows_x86_64_msvc 0.53.0",
+]
+
+[[package]]
+name = "windows-threading"
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b66463ad2e0ea3bbf808b7f1d371311c80e115c0b71d60efc142cafbcfb057a6"
+dependencies = [
+ "windows-link",
 ]
 
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@@ -1648,48 +2129,96 @@ version = "0.52.6"
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+[[package]]
+name = "windows_aarch64_gnullvm"
+version = "0.53.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "86b8d5f90ddd19cb4a147a5fa63ca848db3df085e25fee3cc10b39b6eebae764"
+
 [[package]]
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+[[package]]
+name = "windows_aarch64_msvc"
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+checksum = "c7651a1f62a11b8cbd5e0d42526e55f2c99886c77e007179efff86c2b137e66c"
+
 [[package]]
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+[[package]]
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+checksum = "c1dc67659d35f387f5f6c479dc4e28f1d4bb90ddd1a5d3da2e5d97b42d6272c3"
+
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+[[package]]
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+checksum = "9ce6ccbdedbf6d6354471319e781c0dfef054c81fbc7cf83f338a4296c0cae11"
+
 [[package]]
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+[[package]]
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+version = "0.53.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "581fee95406bb13382d2f65cd4a908ca7b1e4c2f1917f143ba16efe98a589b5d"
+
 [[package]]
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+[[package]]
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+checksum = "2e55b5ac9ea33f2fc1716d1742db15574fd6fc8dadc51caab1c16a3d3b4190ba"
+
 [[package]]
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+[[package]]
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+checksum = "0a6e035dd0599267ce1ee132e51c27dd29437f63325753051e71dd9e42406c57"
+
 [[package]]
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+[[package]]
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+checksum = "271414315aff87387382ec3d271b52d7ae78726f5d44ac98b4f4030c91880486"
+
 [[package]]
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 checksum = "6f42320e61fe2cfd34354ecb597f86f413484a798ba44a8ca1165c58d42da6c1"
 dependencies = [
- "bitflags 2.9.1",
+ "bitflags 2.9.2",
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 [[package]]
diff --git a/Cargo.toml b/Cargo.toml
index de78294..1df2530 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -13,17 +13,33 @@ strip = true  # Automatically strip symbols from the binary.
 name = "asterctl"
 path = "src/main.rs"
 
+[[bin]]
+name = "sysinfo"
+path = "src/bin/sysinfo.rs"
+required-features = ["sysinfo"]
+
+[features]
+sysinfo = ["dep:sysinfo"]
+
 [dependencies]
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 bytes = "1.10.1"
-clap = { version = "4.5.41", features = ["derive"] }
+clap = { version = "4.5.42", features = ["derive"] }
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+sysinfo = {  version = "0.37.0", optional = true }
+itertools = "0.14"
+tempfile = "3"
+
+[dev-dependencies]
+rstest = "0.26"
diff --git a/Monitor3.json b/Monitor3.json
deleted file mode 100644
index d578961..0000000
--- a/Monitor3.json
+++ /dev/null
@@ -1,3767 +0,0 @@
-{
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-    "customPanel": false,
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-    "refresh": 1
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-          "y": 282,
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-        {
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-          "type": 2,
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-          "label": "storage_hdd[3]['temperature']",
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-          "y": 130,
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\ No newline at end of file
diff --git a/README.md b/README.md
index 7936c3b..2bdaab4 100644
--- a/README.md
+++ b/README.md
@@ -90,9 +90,11 @@ cd aoostar-rs
 A release build is highly recommended, as it significantly improves graphics performance:
 
 ```shell
-cargo build --release
+cargo build --release --bins --all-features
 ```
 
+The `--bins` option builds the main `asterctl` app and all other tools.
+
 ### Install
 
 See [Linux systemd Service](linux/) on how to automatically switch off the LCD at boot up.
@@ -105,7 +107,7 @@ text over the image.
 By default, the original LCD USB UART device `416:90A1` is used. See optional parameters to specify a different device.
 
 ```shell
-cargo run --release -- --demo --config Monitor3.json
+cargo run --release -- --demo --config monitor.json
 ```
 
 The `--config` parameter is optional. It loads the official configuration file and displays the defined sensors in the
@@ -118,14 +120,26 @@ first panel.
 - `--help` — Show all options.
 
 
+### Sensor Panel
+
+```shell
+asterctl --config monitor.json
+```
+
+See [sensor panels](doc/sensor_panels.md) for more information.
+
 ### Control Commands
 
+> Aster: Greek for star and similar to AOOSTAR.
+
 Besides demo mode, the following control commands have been implemented.
 
 The `asterctl` binary is built in `./target/release`.  
-Alternatively, use `cargo run --release --` to build and run automatically, for example: `cargo run --release -- --off`.
+Alternatively, use `cargo run --release --` to build and run automatically, for example: 
 
-> Aster: Greek for star and similar to AOOSTAR.
+```shell
+cargo run --release -- --off
+```
 
 **Switch display on:**
 
diff --git a/cfg/default_1_hdd.jpg b/cfg/default_1_hdd.jpg
new file mode 100644
index 0000000..e040bb5
Binary files /dev/null and b/cfg/default_1_hdd.jpg differ
diff --git a/cfg/default_1_index.jpg b/cfg/default_1_index.jpg
new file mode 100644
index 0000000..21f3052
Binary files /dev/null and b/cfg/default_1_index.jpg differ
diff --git a/cfg/monitor.json b/cfg/monitor.json
new file mode 100644
index 0000000..c1df70e
--- /dev/null
+++ b/cfg/monitor.json
@@ -0,0 +1,948 @@
+{
+  "setup": {
+    "switchTime": "30",
+    "refresh": 1
+  },
+  "mianban": [
+    1,
+    2
+  ],
+  "diy": [
+    {
+      "type": 5,
+      "img": "default_1_index.jpg",
+      "sensor": [
+        {
+          "mode": 1,
+          "type": 1,
+          "name": "CPU温度",
+          "label": "cpu_temperature",
+          "x": 195,
+          "y": 110,
+          "width": 0,
+          "height": 0,
+          "textDirection": 0,
+          "direction": 1,
+          "value": "98",
+          "fontFamily": "HarmonyOS_Sans_SC_Bold",
+          "fontSize": 120,
+          "fontColor": -1,
+          "fontWeight": "normal",
+          "textAlign": "center",
+          "integerDigits": -1,
+          "decimalDigits": 0,
+          "unit": "",
+          "minAngle": 0,
+          "maxAngle": 180,
+          "minValue": 0,
+          "maxValue": 100,
+          "pic": "",
+          "xz_x": 0,
+          "xz_y": 0
+        },
+        {
+          "mode": 1,
+          "type": 1,
+          "name": "CPU占用",
+          "label": "cpu_percent",
+          "x": 200,
+          "y": 285,
+          "width": 0,
+          "height": 0,
+          "textDirection": 0,
+          "direction": 1,
+          "value": "98",
+          "fontFamily": "HarmonyOS_Sans_SC_Bold",
+          "fontSize": 60,
+          "fontColor": -1,
+          "fontWeight": "normal",
+          "textAlign": "center",
+          "integerDigits": -1,
+          "decimalDigits": 0,
+          "unit": "%",
+          "minAngle": 0,
+          "maxAngle": 180,
+          "minValue": 0,
+          "maxValue": 100,
+          "pic": "",
+          "xz_x": 0,
+          "xz_y": 0
+        },
+        {
+          "mode": 1,
+          "type": 1,
+          "name": "RAM占用",
+          "label": "memory_usage",
+          "x": 560,
+          "y": 70,
+          "width": 0,
+          "height": 0,
+          "textDirection": 0,
+          "direction": 1,
+          "value": "98",
+          "fontFamily": "HarmonyOS_Sans_SC_Bold",
+          "fontSize": 24,
+          "fontColor": -1,
+          "fontWeight": "normal",
+          "textAlign": "center",
+          "integerDigits": -1,
+          "decimalDigits": 0,
+          "unit": " %",
+          "minAngle": 0,
+          "maxAngle": 180,
+          "minValue": 0,
+          "maxValue": 100,
+          "pic": "",
+          "xz_x": 0,
+          "xz_y": 0
+        },
+        {
+          "mode": 1,
+          "type": 1,
+          "name": "RAM温度",
+          "label": "memory_Temperature",
+          "x": 560,
+          "y": 131,
+          "width": 0,
+          "height": 0,
+          "textDirection": 0,
+          "direction": 1,
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+          "fontWeight": "normal",
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+          "decimalDigits": 0,
+          "unit": " ℃",
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+          "minValue": 0,
+          "maxValue": 100,
+          "pic": "",
+          "xz_x": 0,
+          "xz_y": 0
+        },
+        {
+          "mode": 1,
+          "type": 1,
+          "name": "tt hh:mm:ss",
+          "label": "DATE_m_d_h_m_2",
+          "x": 515,
+          "y": 246,
+          "width": 0,
+          "height": 0,
+          "textDirection": 0,
+          "direction": 1,
+          "value": "下午 06:08:08",
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+          "fontWeight": "normal",
+          "textAlign": "center",
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+          "pic": "",
+          "xz_x": 0,
+          "xz_y": 0
+        },
+        {
+          "mode": 1,
+          "type": 1,
+          "name": "External IP Address",
+          "label": "net_ip_address",
+          "x": 515,
+          "y": 307,
+          "width": 0,
+          "height": 0,
+          "textDirection": 0,
+          "direction": 1,
+          "value": "146.56.182.244",
+          "fontFamily": "HarmonyOS_Sans_SC_Bold",
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+          "fontWeight": "normal",
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+          "pic": "",
+          "xz_x": 0,
+          "xz_y": 0
+        },
+        {
+          "mode": 1,
+          "type": 1,
+          "name": "GPU占用",
+          "label": "gpu_core",
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+          "y": 70,
+          "width": 0,
+          "height": 0,
+          "textDirection": 0,
+          "direction": 1,
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+          "xz_y": 0
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+        {
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+          "y": 131,
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+          "xz_y": 0
+        },
+        {
+          "mode": 1,
+          "type": 1,
+          "name": "网络上传",
+          "label": "net_upload_speed",
+          "x": 852,
+          "y": 246,
+          "width": 0,
+          "height": 0,
+          "textDirection": 0,
+          "direction": 1,
+          "value": "100 K/S",
+          "fontFamily": "HarmonyOS_Sans_SC_Bold",
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+          "pic": "",
+          "xz_x": 0,
+          "xz_y": 0
+        },
+        {
+          "mode": 1,
+          "type": 1,
+          "name": "网络下载",
+          "label": "net_download_speed",
+          "x": 852,
+          "y": 307,
+          "width": 0,
+          "height": 0,
+          "textDirection": 0,
+          "direction": 1,
+          "value": "120 K/S",
+          "fontFamily": "HarmonyOS_Sans_SC_Bold",
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+          "fontWeight": "normal",
+          "textAlign": "center",
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+          "minValue": 0,
+          "maxValue": 100,
+          "pic": "",
+          "xz_x": 0,
+          "xz_y": 0
+        }
+      ]
+    },
+    {
+      "type": 5,
+      "img": "default_1_hdd.jpg",
+      "sensor": [
+        {
+          "mode": 1,
+          "type": 1,
+          "name": "主板温度",
+          "label": "motherboard_temperature",
+          "x": 315,
+          "y": 105,
+          "width": 0,
+          "height": 0,
+          "textDirection": 0,
+          "direction": 1,
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+          "xz_y": 0
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+          "fontSize": 24,
+          "fontColor": -1,
+          "fontWeight": "normal",
+          "textAlign": "center",
+          "integerDigits": -1,
+          "decimalDigits": 0,
+          "unit": " ℃",
+          "minAngle": 0,
+          "maxAngle": 180,
+          "minValue": 0,
+          "maxValue": 100,
+          "pic": "",
+          "xz_x": 0,
+          "xz_y": 0
+        },
+        {
+          "mode": 3,
+          "type": 2,
+          "name": "固态3-进度条",
+          "label": "storage_ssd[2]['used']",
+          "x": 50,
+          "y": 282,
+          "width": 0,
+          "height": 0,
+          "textDirection": 0,
+          "direction": 1,
+          "value": "7",
+          "fontFamily": "HarmonyOS_Sans_SC_Bold",
+          "fontSize": 24,
+          "fontColor": -1,
+          "fontWeight": "normal",
+          "textAlign": "center",
+          "integerDigits": -1,
+          "decimalDigits": 0,
+          "unit": "",
+          "minAngle": 0,
+          "maxAngle": 180,
+          "minValue": 0,
+          "maxValue": 100,
+          "pic": "progress1.png",
+          "xz_x": 0,
+          "xz_y": 0
+        },
+        {
+          "mode": 1,
+          "type": 2,
+          "name": "固态4",
+          "label": "storage_ssd[3]['temperature']",
+          "x": 580,
+          "y": 70,
+          "width": 0,
+          "height": 0,
+          "textDirection": 0,
+          "direction": 1,
+          "value": "7",
+          "fontFamily": "HarmonyOS_Sans_SC_Bold",
+          "fontSize": 24,
+          "fontColor": -1,
+          "fontWeight": "normal",
+          "textAlign": "center",
+          "integerDigits": -1,
+          "decimalDigits": 0,
+          "unit": " ℃",
+          "minAngle": 0,
+          "maxAngle": 180,
+          "minValue": 0,
+          "maxValue": 100,
+          "pic": "",
+          "xz_x": 0,
+          "xz_y": 0
+        },
+        {
+          "mode": 3,
+          "type": 2,
+          "name": "固态4-进度条",
+          "label": "storage_ssd[3]['used']",
+          "x": 400,
+          "y": 45,
+          "width": 0,
+          "height": 0,
+          "textDirection": 0,
+          "direction": 1,
+          "value": "7",
+          "fontFamily": "HarmonyOS_Sans_SC_Bold",
+          "fontSize": 24,
+          "fontColor": -1,
+          "fontWeight": "normal",
+          "textAlign": "center",
+          "integerDigits": -1,
+          "decimalDigits": 0,
+          "unit": "",
+          "minAngle": 0,
+          "maxAngle": 180,
+          "minValue": 0,
+          "maxValue": 100,
+          "pic": "progress2.png",
+          "xz_x": 0,
+          "xz_y": 0
+        },
+        {
+          "mode": 1,
+          "type": 2,
+          "name": "固态5",
+          "label": "storage_ssd[4]['temperature']",
+          "x": 580,
+          "y": 130,
+          "width": 0,
+          "height": 0,
+          "textDirection": 0,
+          "direction": 1,
+          "value": "7",
+          "fontFamily": "HarmonyOS_Sans_SC_Bold",
+          "fontSize": 24,
+          "fontColor": -1,
+          "fontWeight": "normal",
+          "textAlign": "center",
+          "integerDigits": -1,
+          "decimalDigits": 0,
+          "unit": " ℃",
+          "minAngle": 0,
+          "maxAngle": 180,
+          "minValue": 0,
+          "maxValue": 100,
+          "pic": "",
+          "xz_x": 0,
+          "xz_y": 0
+        },
+        {
+          "mode": 3,
+          "type": 2,
+          "name": "固态5-进度条",
+          "label": "storage_ssd[4]['used']",
+          "x": 400,
+          "y": 106,
+          "width": 0,
+          "height": 0,
+          "textDirection": 0,
+          "direction": 1,
+          "value": "7",
+          "fontFamily": "HarmonyOS_Sans_SC_Bold",
+          "fontSize": 24,
+          "fontColor": -1,
+          "fontWeight": "normal",
+          "textAlign": "center",
+          "integerDigits": -1,
+          "decimalDigits": 0,
+          "unit": "",
+          "minAngle": 0,
+          "maxAngle": 180,
+          "minValue": 0,
+          "maxValue": 100,
+          "pic": "progress2.png",
+          "xz_x": 0,
+          "xz_y": 0
+        },
+        {
+          "mode": 1,
+          "type": 2,
+          "name": "硬盘1",
+          "label": "storage_hdd[0]['temperature']",
+          "x": 580,
+          "y": 247,
+          "width": 0,
+          "height": 0,
+          "textDirection": 0,
+          "direction": 1,
+          "value": "7",
+          "fontFamily": "HarmonyOS_Sans_SC_Bold",
+          "fontSize": 24,
+          "fontColor": -1,
+          "fontWeight": "normal",
+          "textAlign": "center",
+          "integerDigits": -1,
+          "decimalDigits": 0,
+          "unit": " ℃",
+          "minAngle": 0,
+          "maxAngle": 180,
+          "minValue": 0,
+          "maxValue": 100,
+          "pic": "",
+          "xz_x": 0,
+          "xz_y": 0
+        },
+        {
+          "mode": 3,
+          "type": 2,
+          "name": "硬盘1-进度条",
+          "label": "storage_hdd[0]['used']",
+          "x": 400,
+          "y": 221,
+          "width": 0,
+          "height": 0,
+          "textDirection": 0,
+          "direction": 1,
+          "value": "7",
+          "fontFamily": "HarmonyOS_Sans_SC_Bold",
+          "fontSize": 24,
+          "fontColor": -1,
+          "fontWeight": "normal",
+          "textAlign": "center",
+          "integerDigits": -1,
+          "decimalDigits": 0,
+          "unit": "",
+          "minAngle": 0,
+          "maxAngle": 180,
+          "minValue": 0,
+          "maxValue": 100,
+          "pic": "progress2.png",
+          "xz_x": 0,
+          "xz_y": 0
+        },
+        {
+          "mode": 1,
+          "type": 2,
+          "name": "硬盘2",
+          "label": "storage_hdd[1]['temperature']",
+          "x": 580,
+          "y": 307,
+          "width": 0,
+          "height": 0,
+          "textDirection": 0,
+          "direction": 1,
+          "value": "7",
+          "fontFamily": "HarmonyOS_Sans_SC_Bold",
+          "fontSize": 24,
+          "fontColor": -1,
+          "fontWeight": "normal",
+          "textAlign": "center",
+          "integerDigits": -1,
+          "decimalDigits": 0,
+          "unit": " ℃",
+          "minAngle": 0,
+          "maxAngle": 180,
+          "minValue": 0,
+          "maxValue": 100,
+          "pic": "",
+          "xz_x": 0,
+          "xz_y": 0
+        },
+        {
+          "mode": 3,
+          "type": 2,
+          "name": "硬盘2-进度条",
+          "label": "storage_hdd[1]['used']",
+          "x": 400,
+          "y": 282,
+          "width": 0,
+          "height": 0,
+          "textDirection": 0,
+          "direction": 1,
+          "value": "7",
+          "fontFamily": "HarmonyOS_Sans_SC_Bold",
+          "fontSize": 24,
+          "fontColor": -1,
+          "fontWeight": "normal",
+          "textAlign": "center",
+          "integerDigits": -1,
+          "decimalDigits": 0,
+          "unit": "",
+          "minAngle": 0,
+          "maxAngle": 180,
+          "minValue": 0,
+          "maxValue": 100,
+          "pic": "progress2.png",
+          "xz_x": 0,
+          "xz_y": 0
+        },
+        {
+          "mode": 1,
+          "type": 2,
+          "name": "硬盘3",
+          "label": "storage_hdd[2]['temperature']",
+          "x": 870,
+          "y": 70,
+          "width": 0,
+          "height": 0,
+          "textDirection": 0,
+          "direction": 1,
+          "value": "7",
+          "fontFamily": "HarmonyOS_Sans_SC_Bold",
+          "fontSize": 24,
+          "fontColor": -1,
+          "fontWeight": "normal",
+          "textAlign": "center",
+          "integerDigits": -1,
+          "decimalDigits": 0,
+          "unit": " ℃",
+          "minAngle": 0,
+          "maxAngle": 180,
+          "minValue": 0,
+          "maxValue": 100,
+          "pic": "",
+          "xz_x": 0,
+          "xz_y": 0
+        },
+        {
+          "mode": 3,
+          "type": 2,
+          "name": "硬盘3-进度条",
+          "label": "storage_hdd[2]['used']",
+          "x": 691,
+          "y": 45,
+          "width": 0,
+          "height": 0,
+          "textDirection": 0,
+          "direction": 1,
+          "value": "7",
+          "fontFamily": "HarmonyOS_Sans_SC_Bold",
+          "fontSize": 24,
+          "fontColor": -1,
+          "fontWeight": "normal",
+          "textAlign": "center",
+          "integerDigits": -1,
+          "decimalDigits": 0,
+          "unit": "",
+          "minAngle": 0,
+          "maxAngle": 180,
+          "minValue": 0,
+          "maxValue": 100,
+          "pic": "progress2.png",
+          "xz_x": 0,
+          "xz_y": 0
+        },
+        {
+          "mode": 1,
+          "type": 2,
+          "name": "硬盘4",
+          "label": "storage_hdd[3]['temperature']",
+          "x": 870,
+          "y": 130,
+          "width": 0,
+          "height": 0,
+          "textDirection": 0,
+          "direction": 1,
+          "value": "7",
+          "fontFamily": "HarmonyOS_Sans_SC_Bold",
+          "fontSize": 24,
+          "fontColor": -1,
+          "fontWeight": "normal",
+          "textAlign": "center",
+          "integerDigits": -1,
+          "decimalDigits": 0,
+          "unit": " ℃",
+          "minAngle": 0,
+          "maxAngle": 180,
+          "minValue": 0,
+          "maxValue": 100,
+          "pic": "",
+          "xz_x": 0,
+          "xz_y": 0
+        },
+        {
+          "mode": 3,
+          "type": 2,
+          "name": "硬盘4-进度条",
+          "label": "storage_hdd[3]['used']",
+          "x": 691,
+          "y": 106,
+          "width": 0,
+          "height": 0,
+          "textDirection": 0,
+          "direction": 1,
+          "value": "7",
+          "fontFamily": "HarmonyOS_Sans_SC_Bold",
+          "fontSize": 24,
+          "fontColor": -1,
+          "fontWeight": "normal",
+          "textAlign": "center",
+          "integerDigits": -1,
+          "decimalDigits": 0,
+          "unit": "",
+          "minAngle": 0,
+          "maxAngle": 180,
+          "minValue": 0,
+          "maxValue": 100,
+          "pic": "progress2.png",
+          "xz_x": 0,
+          "xz_y": 0
+        },
+        {
+          "mode": 1,
+          "type": 2,
+          "name": "硬盘5",
+          "label": "storage_hdd[4]['temperature']",
+          "x": 870,
+          "y": 246,
+          "width": 0,
+          "height": 0,
+          "textDirection": 0,
+          "direction": 1,
+          "value": "7",
+          "fontFamily": "HarmonyOS_Sans_SC_Bold",
+          "fontSize": 24,
+          "fontColor": -1,
+          "fontWeight": "normal",
+          "textAlign": "center",
+          "integerDigits": -1,
+          "decimalDigits": 0,
+          "unit": " ℃",
+          "minAngle": 0,
+          "maxAngle": 180,
+          "minValue": 0,
+          "maxValue": 100,
+          "pic": "",
+          "xz_x": 0,
+          "xz_y": 0
+        },
+        {
+          "mode": 3,
+          "type": 2,
+          "name": "硬盘5-进度条",
+          "label": "storage_hdd[4]['used']",
+          "x": 691,
+          "y": 221,
+          "width": 0,
+          "height": 0,
+          "textDirection": 0,
+          "direction": 1,
+          "value": "7",
+          "fontFamily": "HarmonyOS_Sans_SC_Bold",
+          "fontSize": 24,
+          "fontColor": -1,
+          "fontWeight": "normal",
+          "textAlign": "center",
+          "integerDigits": -1,
+          "decimalDigits": 0,
+          "unit": "",
+          "minAngle": 0,
+          "maxAngle": 180,
+          "minValue": 0,
+          "maxValue": 100,
+          "pic": "progress2.png",
+          "xz_x": 0,
+          "xz_y": 0
+        },
+        {
+          "mode": 1,
+          "type": 2,
+          "name": "硬盘6",
+          "label": "storage_hdd[5]['temperature']",
+          "x": 870,
+          "y": 307,
+          "width": 0,
+          "height": 0,
+          "textDirection": 0,
+          "direction": 1,
+          "value": "7",
+          "fontFamily": "HarmonyOS_Sans_SC_Bold",
+          "fontSize": 24,
+          "fontColor": -1,
+          "fontWeight": "normal",
+          "textAlign": "center",
+          "integerDigits": -1,
+          "decimalDigits": 0,
+          "unit": " ℃",
+          "minAngle": 0,
+          "maxAngle": 180,
+          "minValue": 0,
+          "maxValue": 100,
+          "pic": "",
+          "xz_x": 0,
+          "xz_y": 0
+        },
+        {
+          "mode": 3,
+          "type": 2,
+          "name": "硬盘6-进度条",
+          "label": "storage_hdd[5]['used']",
+          "x": 691,
+          "y": 282,
+          "width": 0,
+          "height": 0,
+          "textDirection": 0,
+          "direction": 1,
+          "value": "7",
+          "fontFamily": "HarmonyOS_Sans_SC_Bold",
+          "fontSize": 24,
+          "fontColor": -1,
+          "fontWeight": "normal",
+          "textAlign": "center",
+          "integerDigits": -1,
+          "decimalDigits": 0,
+          "unit": "",
+          "minAngle": 0,
+          "maxAngle": 180,
+          "minValue": 0,
+          "maxValue": 100,
+          "pic": "progress2.png",
+          "xz_x": 0,
+          "xz_y": 0
+        }
+      ]
+    }
+  ]
+}
\ No newline at end of file
diff --git a/cfg/sensors/values.txt b/cfg/sensors/values.txt
new file mode 100644
index 0000000..beab7fc
--- /dev/null
+++ b/cfg/sensors/values.txt
@@ -0,0 +1,34 @@
+cpu_temperature: 65
+cpu_percent: 98
+memory_usage: 77
+memory_Temperature: 48
+net_ip_address: 146.56.182.244
+gpu_core: 98
+gpu_temperature: 78
+net_upload_speed: 100
+net_upload_speed#unit: K/S
+net_download_speed: 120
+net_download_speed#unit: M/S
+motherboard_temperature: 38
+storage_ssd[0]['temperature']: 31
+storage_ssd[0]['used']: 17
+storage_ssd[1]['temperature']: 32
+storage_ssd[1]['used']: 18
+storage_ssd[2]['temperature']: 33
+storage_ssd[2]['used']: 19
+storage_ssd[3]['temperature']: 34
+storage_ssd[3]['used']: 20
+storage_ssd[4]['temperature']: 35
+storage_ssd[4]['used']: 21
+storage_hdd[0]['temperature']: 36
+storage_hdd[0]['used']: 22
+storage_hdd[1]['temperature']: 37
+storage_hdd[1]['used']: 23
+storage_hdd[2]['temperature']: 38
+storage_hdd[2]['used']: 24
+storage_hdd[3]['temperature']: 39
+storage_hdd[3]['used']: 25
+storage_hdd[4]['temperature']: 40
+storage_hdd[4]['used']: 26
+storage_hdd[5]['temperature']: 41
+storage_hdd[5]['used']: 27
diff --git a/doc/img/sensor_panel-01.png b/doc/img/sensor_panel-01.png
new file mode 100644
index 0000000..90cbc7e
Binary files /dev/null and b/doc/img/sensor_panel-01.png differ
diff --git a/doc/img/sensor_panel-02.png b/doc/img/sensor_panel-02.png
new file mode 100644
index 0000000..9aa0c06
Binary files /dev/null and b/doc/img/sensor_panel-02.png differ
diff --git a/doc/sensor_panels.md b/doc/sensor_panels.md
new file mode 100644
index 0000000..fc602fe
--- /dev/null
+++ b/doc/sensor_panels.md
@@ -0,0 +1,206 @@
+# Sensor Panels
+
+The `asterctl` tool is started in sensor panel mode if the `--config` command line option is specified.
+
+Sensor panels are dynamic screens showing various sensor values. Multiple rotating panels are supported. 
+The sensor values must be provided in simple key-value text files from external scripts or tools. The `asterctl` tool
+is only responsible for rendering the panels on the embedded screen.
+
+Example panels from the AOOSTAR-X software, rendered with `asterctl` using dummy sensor values:
+
+<img src="img/sensor_panel-01.png" alt="Sensor panel 1">
+
+<img src="img/sensor_panel-02.png" alt="Sensor panel 1">
+
+## Supported Features
+
+- One or multiple panels rotating in configurable interval (configuration value `setup.switchTime`).
+- Each panel can be configured with multiple sensor fields.
+  - Only text sensor value fields are supported (`sensor.mode: 1`).
+  - Fan (2), progress (3) and pointer (4) sensors are not supported.
+- Each sensor field can be customized with an individual font, size, color and text alignment.
+- Panels are redrawn at a configurable interval (configuration value `setup.refresh`).
+  - Only the updated areas of the image are sent to the display for faster updates.
+
+## Panel Configuration File
+
+Specify configuration file to use:
+```shell
+asterctl --config monitor.json
+```
+
+- The configuration file is loaded from the configuration directory if not an absolute path is specified.
+- The default configuration directory is `./cfg` and can be changed with the `--config-dir` command line option.
+
+The original AOOSTAR-X json configuration file format is used, but only use a subset of the configuration is supported:
+
+- Setup object fields:
+  - `switchTime`: Optional switch time between panels in seconds, string value interpreted as float and converted to milliseconds. Default: 5
+  - `refresh`: Panel redraw interval in seconds specified as a float number. Default: 1
+- Panel object fields in `diy[]`:
+  - `img`: Background image filename. Loaded from the specified configuration directory if not an absolute path is specified.
+  - `sensor`: Array of sensor objects.
+- Sensor object fields:
+  - `label`: label identifier, also used as sensor value data source identifier
+  - `integerDigits`: sensor value format option: number of integer places. Value is 0-prefixed to number of places and set to `99` if overflown.
+  - `decimalDigits`: sensor value format option: number of decimal places.
+  - `unit`: optional unit label, appended after the sensor value
+  - `x`: x-position
+  - `y`: y-position
+  - `fontFamily`: Font name matching font filename without file extension. Fonts are loaded from the configured font directory.
+  - `fontSize`: Font size
+  - `fontColor`: Font color in `#RRGGBB` notation, or `-1` if not set. Examples: `#ffffff` = white, `#ff0000` = red. Default: `#ffffff` 
+  - `textAlign`: Text alignment: `left`, `right`, `center`
+
+Example configuration file: [cfg/monitor.json](../cfg/monitor.json).
+
+Sensor values are not read from the configuration file (the `sensor.value` field is ignored). See data sources below.
+
+More options might be supported later.
+
+## Sensor Data Sources
+
+Sensor values are provided in separate text files and are automatically read when the file changes.
+Only the file data source is supported at the moment, other sources like pipes, sockets etc. might be supported later.
+
+### Text File Data Source
+
+- Text file with ending: `.txt`
+- Simple key / value pairs, separated by a colon `:`. Example: `foo: bar`
+- Line based: one key / value per line.
+- Key and value are trimmed. Any whitespace will be removed.
+- Empty lines and comments are ignored.
+- Comments start with `#` at the beginning of the line.
+- Support for special keys: if key ends with `#unit` then the value is the unit for the corresponding key before the suffix
+    - Example: `net_download_speed#unit: M/S` is the unit value for `net_download_speed`.
+    - This can be used for dynamic unit values if they sensor value provider cannot add the unit to the corresponding value.
+- File contents will automatically be read when updated.
+    - This requires the sensor value provider to use atomic file updates!
+    - Best practice is to use a temporary file on the same filesystem and use a move or rename operation after all values have been written.
+- One or multiple sensor text files are supported.
+    - Either a single file can be specified, or a directory path.
+    - If a directory is specified, all children matching the sensor file naming pattern will be read and monitored.
+    - Any subdirectories are ignored (no recursive support).
+
+Example text file for the [cfg/monitor.json](../cfg/monitor.json) panel configuration:
+
+<details>
+
+```
+cpu_temperature: 65
+cpu_percent: 98
+memory_usage: 77
+memory_Temperature: 48
+net_ip_address: 146.56.182.244
+gpu_core: 98
+gpu_temperature: 78
+net_upload_speed: 100
+net_upload_speed#unit: K/S
+net_download_speed: 120
+net_download_speed#unit: M/S
+motherboard_temperature: 38
+storage_ssd[0]['temperature']: 31
+storage_ssd[0]['used']: 17
+storage_ssd[1]['temperature']: 32
+storage_ssd[1]['used']: 27
+storage_ssd[2]['temperature']: 33
+storage_ssd[2]['used']: 37
+storage_ssd[3]['temperature']: 34
+storage_ssd[3]['used']: 47
+storage_ssd[4]['temperature']: 35
+storage_ssd[4]['used']: 57
+storage_hdd[0]['temperature']: 36
+storage_hdd[0]['used']: 17
+storage_hdd[1]['temperature']: 37
+storage_hdd[1]['used']: 27
+storage_hdd[2]['temperature']: 38
+storage_hdd[2]['used']: 37
+storage_hdd[3]['temperature']: 39
+storage_hdd[3]['used']: 47
+storage_hdd[4]['temperature']: 40
+storage_hdd[4]['used']: 57
+storage_hdd[5]['temperature']: 10
+storage_hdd[5]['used']: 67
+```
+
+</details>
+
+### Shell Scripts
+
+The [/linux/scripts](../linux/scripts) directory contains some proof-of-concept Linux shell scripts.
+
+CPU and memory usage are written into a sensor data source text file that can be used by `asterctl`.
+
+```
+./cpu_usage.sh -h
+Simple PoC script to periodically write the CPU usage into a sensor text file.
+
+Usage:
+./cpu_usage.sh [-r REFRESH] [-s SENSOR_FILE] [-t TEMP_DIR]
+
+  -r REFRESH     refresh in seconds.  Default: 1
+  -s SENSOR_FILE output sensor file.  Default: /tmp/sensors/cpu.txt
+  -t TEMP_DIR    temporary directory. Default: /tmp
+```
+
+```
+./mem_usage.sh -h
+Simple PoC script to periodically write the memory usage into a sensor text file.
+
+Usage:
+./mem_usage.sh [-r REFRESH] [-s SENSOR_FILE] [-t TEMP_DIR]
+
+  -r REFRESH     refresh in seconds.  Default: 5
+  -s SENSOR_FILE output sensor file.  Default: /tmp/sensors/mem.txt
+  -t TEMP_DIR    temporary directory. Default: /tmp
+```
+
+### sysinfo Tool
+
+The Rust based [/src/bin/sysinfo.rs](../src/bin/sysinfo.rs) tool gathers many more system sensor values with the help of
+the [sysinfo](https://github.com/GuillaumeGomez/sysinfo) crate.
+
+It supports FreeBSD, Linux, macOS, Windows and other OSes, but it has only been tested on Linux so far.
+
+```
+Proof of concept sensor value collection for the asterctl screen control tool
+
+Usage: sysinfo [OPTIONS]
+
+Options:
+  -o, --out <OUT>
+          Output sensor file
+
+  -t, --temp-dir <TEMP_DIR>
+          Temporary directory for preparing the output sensor file.
+          
+          The system temp directory is used if not specified.
+          The temp directory must be on the same file system for atomic rename operation!
+
+      --console
+          Print values in console
+
+  -r, --refresh <REFRESH>
+          System sensor refresh interval in seconds
+
+      --disk-refresh <DISK_REFRESH>
+          Enable individual disk refresh logic as used in AOOSTAR-X. Refresh interval in seconds
+
+      --smartctl
+          Retrieve drive temperature if `disk-update` option is enabled.
+          
+          Requires smartctl and password-less sudo!
+```
+
+Single test run with printing all sensors on the console:
+```shell
+sysinfo --console
+```
+
+Normal mode providing sensor values for `asterctl` in `/tmp/sensors/sysinfo.txt`:
+
+```shell
+sysinfo --refresh 3 --out /tmp/sensor/sysinfo.txt
+```
+
+Note: the lower the refresh rate, the more resources are used!
diff --git a/fonts/HarmonyOS_Sans_SC.LICENSE b/fonts/HarmonyOS_Sans_SC.LICENSE
new file mode 100644
index 0000000..192936a
--- /dev/null
+++ b/fonts/HarmonyOS_Sans_SC.LICENSE
@@ -0,0 +1,26 @@
+https://consumer.huawei.com/za/community/details/topicId-145064/
+
+Huawei has officially launched its self-developed operating system – HarmonyOS 2 and also released a brand new custom
+font HarmonyOS Sans, which is free for commercial use. The main feature is optimized font grayscale and unified
+multilingual glyphs style, etc., the official download is now available.
+
+Download HarmonyOS Sans
+
+Huawei stated that by studying users’ reading feedback on multi-terminal devices in different scenarios, it
+comprehensively considers factors such as the size and usage scenarios of different devices, and comprehensively
+considers the font size and characters caused by differences in viewing distance and viewing angle when users use
+devices. This font was designed with heavy and different demands.
+
+It is worth mentioning that in addition to Huawei, Google, Ali, OPPO and other vendors have released their own free
+commercial fonts, while vendors such as Microsoft and Xiaomi have their own fonts, but they are not commercially
+available.
+
+HarmonyOS Sans was produced by the font design team of Hanyi font library, focusing on the functionality and
+universality of the Internet of Everything. It is a multi-language, stepless, variable font that makes the reading
+experience in multiple languages more consistent.
+
+It is reported that the font supports five writing systems including simplified and traditional Chinese, Latin,
+Cyrillic, Greek, and Arabic, and supports 105 languages for global coverage, helping to build a smart world with all
+things connected.
+
+Download from: https://developer.huawei.com/consumer/en/design/resource/
diff --git a/fonts/HarmonyOS_Sans_SC_Bold.ttf b/fonts/HarmonyOS_Sans_SC_Bold.ttf
new file mode 100644
index 0000000..5c925d1
Binary files /dev/null and b/fonts/HarmonyOS_Sans_SC_Bold.ttf differ
diff --git a/linux/scripts/cpu_usage.sh b/linux/scripts/cpu_usage.sh
new file mode 100755
index 0000000..81efd73
--- /dev/null
+++ b/linux/scripts/cpu_usage.sh
@@ -0,0 +1,73 @@
+#!/bin/bash
+# Simple proof-of-concept Linux shell script to periodically write the CPU usage into a sensor text file.
+#
+# A single sensor `cpu_percent` is written to the sensor file containing the overall cpu usage in percent.
+# CPU usage is calculated every second.
+#
+# CPU usage logic from:
+# https://stackoverflow.com/questions/9229333/how-to-get-overall-cpu-usage-e-g-57-on-linux
+#
+set -e
+set -o pipefail
+
+REFRESH=1
+TEMP_DIR="${TMPDIR:-/tmp}"
+TMP_SENSOR_FILE="${TEMP_DIR}/cpu.txt.tmp"
+SENSOR_FILE="${TEMP_DIR}/sensors/cpu.txt"
+
+#=============================================================
+
+usage() {
+  cat << EOF
+Simple PoC script to periodically write the CPU usage into a sensor text file.
+
+Usage:
+$0 [-r REFRESH] [-s SENSOR_FILE] [-t TEMP_DIR]
+
+  -r REFRESH     refresh in seconds.  Default: $REFRESH
+  -s SENSOR_FILE output sensor file.  Default: $SENSOR_FILE
+  -t TEMP_DIR    temporary directory. Default: $TEMP_DIR
+
+EOF
+  exit 1
+}
+
+#=============================================================
+
+#------------------------------------------------------------------------------
+# Start of script
+#------------------------------------------------------------------------------
+# check command line arguments
+while getopts "r:s:t:h" opt; do
+  case ${opt} in
+    "r")
+      REFRESH="$OPTARG"
+      ;;
+    "s")
+      SENSOR_FILE="$OPTARG"
+      ;;
+    "t")
+      TMP_SENSOR_FILE="$OPTARG/cpu.txt.tmp"
+      ;;
+    h )
+        usage
+        ;;
+    : )
+        echo "Option: -$OPTARG requires an argument" 1>&2
+        usage
+        ;;
+   \? )
+        echo "Invalid option: -$OPTARG" 1>&2
+        usage
+        ;;
+  esac
+done
+
+mkdir -p "$(dirname "$SENSOR_FILE")"
+
+while :
+do
+  USAGE=$({ head -n1 /proc/stat;sleep "$REFRESH";head -n1 /proc/stat; } | awk '/^cpu /{u=$2-u;s=$4-s;i=$5-i;w=$6-w}END{print "cpu_percent:"int(0.5+100*(u+s+w)/(u+s+i+w))}')
+  echo "$USAGE" > "$TMP_SENSOR_FILE"
+  mv "$TMP_SENSOR_FILE" "$SENSOR_FILE"
+done
diff --git a/linux/scripts/mem_usage.sh b/linux/scripts/mem_usage.sh
new file mode 100755
index 0000000..2c664ae
--- /dev/null
+++ b/linux/scripts/mem_usage.sh
@@ -0,0 +1,84 @@
+#!/bin/bash
+# Simple proof-of-concept Linux shell script to periodically write the memory usage into a sensor text file.
+#
+# The following sensor values are written to the sensor file.
+# - memory_total in bytes
+# - memory_free in bytes
+# - memory_available in bytes
+# - memory_usage in percent
+#
+# Memory usage is calculated every five seconds.
+
+set -e
+set -o pipefail
+
+REFRESH=5
+TEMP_DIR="${TMPDIR:-/tmp}"
+TMP_SENSOR_FILE="${TEMP_DIR}/mem.txt.tmp"
+SENSOR_FILE="${TEMP_DIR}/sensors/mem.txt"
+
+#=============================================================
+
+usage() {
+  cat << EOF
+Simple PoC script to periodically write the memory usage into a sensor text file.
+
+Usage:
+$0 [-r REFRESH] [-s SENSOR_FILE] [-t TEMP_DIR]
+
+  -r REFRESH     refresh in seconds.  Default: $REFRESH
+  -s SENSOR_FILE output sensor file.  Default: $SENSOR_FILE
+  -t TEMP_DIR    temporary directory. Default: $TEMP_DIR
+
+EOF
+  exit 1
+}
+
+#=============================================================
+
+#------------------------------------------------------------------------------
+# Start of script
+#------------------------------------------------------------------------------
+# check command line arguments
+while getopts "r:s:t:h" opt; do
+  case ${opt} in
+    "r")
+      REFRESH="$OPTARG"
+      ;;
+    "s")
+      SENSOR_FILE="$OPTARG"
+      ;;
+    "t")
+      TMP_SENSOR_FILE="$OPTARG/mem.txt.tmp"
+      ;;
+    h )
+        usage
+        ;;
+    : )
+        echo "Option: -$OPTARG requires an argument" 1>&2
+        usage
+        ;;
+   \? )
+        echo "Invalid option: -$OPTARG" 1>&2
+        usage
+        ;;
+  esac
+done
+
+mkdir -p "$(dirname "$SENSOR_FILE")"
+
+while :
+do
+  MEM_TOTAL=$(grep MemTotal /proc/meminfo | awk '{print $2}')
+  MEM_FREE=$(grep MemFree /proc/meminfo | awk '{print $2}')
+  MEM_AVAILABLE=$(grep MemAvailable /proc/meminfo | awk '{print $2}')
+
+  printf "memory_total:%d\nmemory_free:%d\nmemory_available:%d\nmemory_usage:%d\n" \
+    "$MEM_TOTAL" \
+    "$MEM_FREE" \
+    "$MEM_AVAILABLE" \
+    $(((MEM_TOTAL - MEM_AVAILABLE) * 100 / MEM_TOTAL)) > "$TMP_SENSOR_FILE"
+  mv "$TMP_SENSOR_FILE" "$SENSOR_FILE"
+
+  sleep "$REFRESH"
+done
diff --git a/src/bin/sysinfo.rs b/src/bin/sysinfo.rs
new file mode 100644
index 0000000..c4170de
--- /dev/null
+++ b/src/bin/sysinfo.rs
@@ -0,0 +1,765 @@
+// SPDX-License-Identifier: MIT OR Apache-2.0
+// SPDX-FileCopyrightText: Copyright (c) 2025 Markus Zehnder
+
+use clap::Parser;
+use env_logger::Env;
+use itertools::Itertools;
+use log::{debug, error, info};
+use regex::Regex;
+use std::cmp::PartialEq;
+use std::collections::HashMap;
+use std::fmt::Display;
+use std::fs;
+use std::io::{BufWriter, Write};
+use std::path::{Path, PathBuf};
+use std::process::{Command, exit};
+use std::thread::sleep;
+use std::time::{Duration, Instant};
+use sysinfo::{Components, DiskKind, Disks, Networks, System};
+use tempfile::NamedTempFile;
+
+/// Proof of concept sensor value collection for the asterctl screen control tool.
+#[derive(Parser, Debug)]
+#[command(version, about, long_about = None)]
+struct Args {
+    /// Output sensor file.
+    #[arg(short, long)]
+    out: Option<PathBuf>,
+
+    /// Temporary directory for preparing the output sensor file.
+    ///
+    /// The system temp directory is used if not specified.
+    /// The temp directory must be on the same file system for atomic rename operation!
+    #[arg(short, long)]
+    temp_dir: Option<PathBuf>,
+
+    /// Print values in console
+    #[arg(long)]
+    console: bool,
+
+    /// System sensor refresh interval in seconds
+    #[arg(short, long)]
+    refresh: Option<u16>,
+
+    /// Enable individual disk refresh logic as used in AOOSTAR-X. Refresh interval in seconds.
+    #[arg(long)]
+    disk_refresh: Option<u16>,
+
+    /// Retrieve drive temperature if `disk-update` option is enabled.
+    ///
+    /// Requires smartctl and password-less sudo!
+    #[cfg(target_os = "linux")]
+    #[arg(long)]
+    smartctl: bool,
+}
+
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    env_logger::Builder::from_env(Env::default().default_filter_or("info")).init();
+
+    let args = Args::parse();
+    #[cfg(target_os = "linux")]
+    let use_smartctl = args.smartctl;
+    #[cfg(not(target_os = "linux"))]
+    let use_smartctl = false;
+
+    let mut sensors = HashMap::with_capacity(64);
+    let mut sysinfo_source = SysinfoSource::new();
+
+    let refresh = Duration::from_secs(args.refresh.unwrap_or_default() as u64);
+
+    let disk_refresh = Duration::from_secs(args.disk_refresh.unwrap_or_default() as u64);
+    let mut disk_refresh_time = Instant::now();
+    if !disk_refresh.is_zero() {
+        update_linux_storage_sensors(&mut sensors, use_smartctl)?;
+    }
+
+    loop {
+        let upd_start_time = Instant::now();
+
+        sysinfo_source.refresh();
+        sysinfo_source.update_sensors(&mut sensors)?;
+
+        if !disk_refresh.is_zero() && disk_refresh_time.elapsed() > disk_refresh {
+            info!("Refreshing individual disks");
+            update_linux_storage_sensors(&mut sensors, use_smartctl)?;
+            disk_refresh_time = Instant::now();
+        }
+
+        if let Some(out_file) = &args.out {
+            write_sensor_file(out_file, args.temp_dir.as_deref(), &sensors)?;
+        }
+
+        if args.console {
+            // pretty print console output with sorted keys
+            for (label, value) in sensors.iter().sorted() {
+                println!("{}: {}", label, value);
+            }
+            println!();
+        }
+
+        if refresh.is_zero() {
+            break;
+        }
+
+        let elapsed = upd_start_time.elapsed();
+        if refresh > elapsed {
+            sleep(refresh - elapsed);
+        }
+    }
+
+    Ok(())
+}
+
+fn write_sensor_file(
+    out_file: &Path,
+    temp_dir: Option<&Path>,
+    sensors: &HashMap<String, String>,
+) -> Result<(), Box<dyn std::error::Error>> {
+    if out_file.is_dir() {
+        error!("Output cannot be a directory: {}", out_file.display());
+        exit(1);
+    }
+
+    let tmp_file = if let Some(temp_path) = temp_dir {
+        fs::create_dir_all(temp_path)?;
+        NamedTempFile::new_in(temp_path)?
+    } else {
+        NamedTempFile::new()?
+    };
+
+    let mut stream = BufWriter::new(&tmp_file);
+
+    for (label, value) in sensors.iter() {
+        writeln!(stream, "{label}: {value}")?;
+    }
+
+    stream.flush()?;
+    drop(stream);
+    tmp_file.persist(out_file)?;
+
+    Ok(())
+}
+
+pub struct SysinfoSource {
+    sys: System,
+    disks: Disks,
+    components: Components,
+    networks: Networks,
+    last_refresh: Option<Instant>,
+    refresh_duration: Option<Duration>,
+}
+
+impl Default for SysinfoSource {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+impl SysinfoSource {
+    pub fn new() -> Self {
+        Self {
+            sys: System::new_all(),
+            disks: Disks::new(),
+            components: Components::new(),
+            networks: Networks::new(),
+            last_refresh: None,
+            refresh_duration: None,
+        }
+    }
+
+    pub fn refresh(&mut self) {
+        self.sys.refresh_all();
+        // TODO research "remove_not_listed_###" refresh parameter
+        self.disks.refresh(false);
+        self.components.refresh(false);
+        self.networks.refresh(false);
+
+        if let Some(last_refresh) = self.last_refresh {
+            self.refresh_duration = Some(last_refresh.elapsed());
+        }
+        self.last_refresh = Some(Instant::now());
+    }
+
+    fn update_sensors(
+        &self,
+        sensors: &mut HashMap<String, String>,
+    ) -> Result<(), Box<dyn std::error::Error>> {
+        for cpu in self.sys.cpus() {
+            add_sensor(
+                sensors,
+                format!("cpu_{}_frequency", cpu.name()),
+                cpu.frequency(),
+            );
+            add_sensor(
+                sensors,
+                format!("cpu_{}_usage", cpu.name()),
+                format!("{:.2}", cpu.cpu_usage()),
+            );
+        }
+
+        let load_avg = System::load_average();
+        add_sensor(sensors, "load_avg_one", format!("{:.2}", load_avg.one));
+        add_sensor(sensors, "load_avg_five", format!("{:.2}", load_avg.five));
+        add_sensor(
+            sensors,
+            "load_avg_fifteen",
+            format!("{:.2}", load_avg.fifteen),
+        );
+
+        // RAM and swap information:
+        add_sensor(sensors, "mem_free_bytes", self.sys.free_memory());
+        add_sensor(sensors, "mem_free", format_bytes(self.sys.free_memory()));
+        add_sensor(sensors, "mem_total_bytes", self.sys.total_memory());
+        add_sensor(sensors, "mem_total", format_bytes(self.sys.total_memory()));
+        add_sensor(sensors, "mem_used_bytes", self.sys.used_memory());
+        add_sensor(sensors, "mem_used", format_bytes(self.sys.used_memory()));
+        add_sensor(
+            sensors,
+            "mem_usage_percent",
+            format!(
+                "{:.1}",
+                (self.sys.used_memory() * 100) as f64 / self.sys.total_memory() as f64
+            ),
+        );
+
+        add_sensor(sensors, "swap_free_bytes", self.sys.free_swap());
+        add_sensor(sensors, "swap_free", format_bytes(self.sys.free_swap()));
+        add_sensor(sensors, "swap_total_bytes", self.sys.total_swap());
+        add_sensor(sensors, "swap_total", format_bytes(self.sys.total_swap()));
+        add_sensor(sensors, "swap_used_bytes", self.sys.used_swap());
+        add_sensor(sensors, "swap_used", format_bytes(self.sys.used_swap()));
+        add_sensor(
+            sensors,
+            "swap_usage_percent",
+            format!(
+                "{:.1}",
+                (self.sys.used_swap() * 100) as f64 / self.sys.total_swap() as f64
+            ),
+        );
+
+        // System information:
+        if let Some(name) = System::name() {
+            add_sensor(sensors, "system_name", name);
+        }
+        if let Some(kernel_version) = System::kernel_version() {
+            add_sensor(sensors, "system_kernel_version", kernel_version);
+        }
+        if let Some(os_version) = System::os_version() {
+            add_sensor(sensors, "system_os_version", os_version);
+        }
+        if let Some(host_name) = System::host_name() {
+            add_sensor(sensors, "system_hostname", host_name);
+        }
+
+        add_sensor(sensors, "cpu_count", self.sys.cpus().len());
+        add_sensor(sensors, "total_processes", self.sys.processes().len());
+
+        // disks' information:
+        let mut ssd_idx = 0;
+        let mut hdd_idx = 0;
+        for disk in &self.disks {
+            let label;
+            match disk.kind() {
+                DiskKind::SSD => {
+                    label = format!("storage_ssd[{}]", ssd_idx);
+                    ssd_idx += 1;
+                }
+                DiskKind::HDD => {
+                    label = format!("storage_hdd[{}]", hdd_idx);
+                    hdd_idx += 1;
+                }
+                _ => continue,
+            }
+            // special label for AOOSTAR-X system panel
+            add_sensor(
+                sensors,
+                format!("{label}_usage_percent"),
+                (disk.total_space() - disk.available_space()) * 100 / disk.total_space(),
+            );
+
+            // using similar labels as AOOSTAR-X, but combining `{label2}_{label}`
+            let device = disk.name().to_string_lossy().replace(' ', "_");
+            add_sensor(
+                sensors,
+                format!("disk_{device}_total_bytes"),
+                disk.total_space(),
+            );
+            add_sensor(
+                sensors,
+                format!("disk_{device}_total"),
+                format_bytes(disk.total_space()),
+            );
+            let used = disk.total_space() - disk.available_space();
+            add_sensor(sensors, format!("disk_{device}_used_bytes"), used);
+            add_sensor(sensors, format!("disk_{device}_used"), format_bytes(used));
+            add_sensor(
+                sensors,
+                format!("disk_{device}_free_bytes"),
+                disk.available_space(),
+            );
+            add_sensor(
+                sensors,
+                format!("disk_{device}_free"),
+                format_bytes(disk.available_space()),
+            );
+            add_sensor(
+                sensors,
+                format!("disk_{device}_usage_percent"),
+                format!(
+                    "{:.1}",
+                    (disk.total_space() - disk.available_space()) as f64 * 100.0
+                        / disk.total_space() as f64
+                ),
+            );
+        }
+
+        // Components temperature:
+        for component in &self.components {
+            if let Some(temperature) = component.temperature() {
+                let label;
+                if component.label().contains("spd5118") {
+                    label = "temperature_memory".to_string();
+                } else if component.label().contains("amdgpu") {
+                    label = "temperature_gpu".to_string();
+                } else if component.label().contains("Tctl") {
+                    label = "temperature_cpu".to_string();
+                } else if component.label().contains("Composite")
+                    && !component.label().contains("nvme")
+                {
+                    // just a guess...
+                    label = "temperature_motherboard".to_string();
+                } else {
+                    label = format!("temperature_{}", component.label().replace(' ', "_"));
+                    // println!("label={}, type_id={:?}, id={:?}, {component:?}",
+                    //          component.label(), component.type_id(), component.id());
+                }
+
+                // TODO add unit as a separate sensor?
+                add_sensor(sensors, label, format!("{temperature:.1} °C"));
+            }
+        }
+
+        // Network interfaces name, total data received and total data transmitted:
+        for (interface_name, data) in &self.networks {
+            // only consider specific interfaces
+            let if_name = interface_name.to_lowercase();
+            if !["eth", "en", "em", "wlan", "wlp", "wlo"]
+                .iter()
+                .any(|i| if_name.starts_with(*i))
+            {
+                continue;
+            }
+            // Sort by address to avoid random order in refreshes
+            for (idx, addr) in data
+                .ip_networks()
+                .iter()
+                .map(|net| net.addr)
+                .sorted()
+                .enumerate()
+            {
+                add_sensor(
+                    sensors,
+                    format!("network_{interface_name}_address{idx}"),
+                    addr,
+                );
+            }
+
+            if let Some(refresh) = self.refresh_duration {
+                let interval = refresh.as_millis() as u64;
+                if interval > 0 {
+                    add_sensor(
+                        sensors,
+                        format!("network_{interface_name}_download_speed"),
+                        format!("{}/s", format_bytes(1000 * data.received() / interval)),
+                    );
+                    add_sensor(
+                        sensors,
+                        format!("network_{interface_name}_upload_speed"),
+                        format!("{}/s", format_bytes(1000 * data.transmitted() / interval)),
+                    );
+                }
+            }
+
+            add_sensor(
+                sensors,
+                format!("network_{interface_name}_total_received_bytes"),
+                data.total_received(),
+            );
+            add_sensor(
+                sensors,
+                format!("network_{interface_name}_total_received"),
+                format_bytes(data.total_received()),
+            );
+            add_sensor(
+                sensors,
+                format!("network_{interface_name}_total_transmitted_bytes"),
+                data.total_transmitted(),
+            );
+            add_sensor(
+                sensors,
+                format!("network_{interface_name}_total_transmitted"),
+                format_bytes(data.total_transmitted()),
+            );
+        }
+
+        Ok(())
+    }
+}
+
+fn add_sensor(
+    sensors: &mut HashMap<String, String>,
+    label: impl Into<String>,
+    value: impl Display,
+) {
+    sensors.insert(label.into(), value.to_string());
+}
+
+fn update_linux_storage_sensors(
+    sensors: &mut HashMap<String, String>,
+    use_smartctl: bool,
+) -> Result<(), Box<dyn std::error::Error>> {
+    // Note: AOOSTAR-X only considered spinning Rust. Too bad if you're using SSDs in the HD bays...
+    if let Ok(hdd_devices) = get_storage_devices(StorageDevice::HddOrSsd) {
+        debug!("HDD devices : {:?}", hdd_devices);
+        for (idx, device) in hdd_devices.iter().enumerate() {
+            let usage = get_disk_usage(device)?;
+            add_sensor(
+                sensors,
+                format!("storage_hdd[{idx}]_total_size_bytes"),
+                usage.total_size,
+            );
+            add_sensor(
+                sensors,
+                format!("storage_hdd[{idx}]_total_size"),
+                format_bytes(usage.total_size),
+            );
+            add_sensor(
+                sensors,
+                format!("storage_hdd[{idx}]_total_used_bytes"),
+                usage.total_used,
+            );
+            add_sensor(
+                sensors,
+                format!("storage_hdd[{idx}]_total_used"),
+                format_bytes(usage.total_used),
+            );
+            add_sensor(
+                sensors,
+                format!("storage_hdd[{idx}]_usage_percent"),
+                usage.usage_percent,
+            );
+
+            if use_smartctl && let Some(temperature) = get_smartctl_disk_temperature(device)? {
+                add_sensor(
+                    sensors,
+                    format!("storage_hdd[{idx}]_temperature"),
+                    temperature,
+                );
+            }
+        }
+    }
+
+    // AOOSTAR-X: ssd == nvme
+    if let Ok(nvme_devices) = get_storage_devices(StorageDevice::Nvme) {
+        debug!("NVME devices: {:?}", nvme_devices);
+        for (idx, device) in nvme_devices.iter().enumerate() {
+            let usage = get_disk_usage(device)?;
+            add_sensor(
+                sensors,
+                format!("storage_ssd[{idx}]_total_size_bytes"),
+                usage.total_size,
+            );
+            add_sensor(
+                sensors,
+                format!("storage_ssd[{idx}]_total_size"),
+                format_bytes(usage.total_size),
+            );
+            add_sensor(
+                sensors,
+                format!("storage_ssd[{idx}]_total_used_bytes"),
+                usage.total_used,
+            );
+            add_sensor(
+                sensors,
+                format!("storage_ssd[{idx}]_total_used"),
+                format_bytes(usage.total_used),
+            );
+            add_sensor(
+                sensors,
+                format!("storage_ssd[{idx}]_usage_percent"),
+                usage.usage_percent,
+            );
+
+            if use_smartctl && let Some(temperature) = get_smartctl_disk_temperature(device)? {
+                add_sensor(
+                    sensors,
+                    format!("storage_ssd[{idx}]_temperature"),
+                    temperature,
+                );
+            }
+        }
+    }
+
+    Ok(())
+}
+
+#[derive(Debug)]
+pub struct DiskInfo {
+    pub device: String,
+    pub temperature: i32,
+    pub used: f64,
+    pub total_used: u64,
+    pub total_size: u64,
+}
+
+#[derive(Debug)]
+pub struct DiskUsage {
+    pub usage_percent: f64,
+    pub total_used: u64,
+    pub total_size: u64,
+}
+
+#[derive(Debug, PartialEq)]
+pub enum StorageDevice {
+    All,
+    Hdd,
+    Ssd,
+    HddOrSsd,
+    Nvme,
+}
+
+pub type DiskResult = Result<Vec<DiskInfo>, Box<dyn std::error::Error>>;
+
+/// Get storage devices of the given type: NVME, SSD or HD
+///
+/// Storage devices are identified from /sys/block attributes.
+/// Removable devices are excluded.
+///
+/// # Arguments
+///
+/// * `kind`: type of storage device
+///
+/// returns: sorted list of found device names (`sd*` and `nvme*`)
+pub fn get_storage_devices(kind: StorageDevice) -> Result<Vec<String>, Box<dyn std::error::Error>> {
+    let mut devices = Vec::new();
+    let sys_block = Path::new("/sys/block");
+
+    if !sys_block.exists() {
+        info!("No storage device found");
+        return Ok(devices);
+    }
+
+    let device_regex = Regex::new(r"^sd[a-z]+$")?;
+    let nvme_regex = Regex::new(r"^nvme[0-9]+n[0-9]+$")?;
+
+    for entry in fs::read_dir(sys_block)? {
+        let entry = entry?;
+        let dev_name = entry.file_name();
+        let dev_str = dev_name.to_string_lossy();
+
+        // filter out all non sd* and nvme* devices
+        let is_nvme = nvme_regex.is_match(&dev_str);
+        let is_storage = device_regex.is_match(&dev_str);
+        if !(is_nvme || is_storage) {
+            continue;
+        }
+
+        match kind {
+            StorageDevice::All => {}
+            StorageDevice::Hdd | StorageDevice::Ssd | StorageDevice::HddOrSsd => {
+                if !is_storage {
+                    continue;
+                }
+            }
+            StorageDevice::Nvme => {
+                if !is_nvme {
+                    continue;
+                }
+            }
+        };
+
+        if is_nvme {
+            let dev_name = entry.file_name();
+            let dev_str = dev_name.to_string_lossy();
+            devices.push(dev_str.to_string());
+            continue;
+        }
+
+        let rotational_path = sys_block.join(dev_str.as_ref()).join("queue/rotational");
+        let removable_path = sys_block.join(dev_str.as_ref()).join("removable");
+
+        match (
+            fs::read_to_string(&rotational_path),
+            fs::read_to_string(&removable_path),
+        ) {
+            (Ok(rotational), Ok(removable)) => {
+                let rotational = rotational.trim();
+                let removable = removable.trim();
+
+                // ignore removable
+                if removable == "1" {
+                    continue;
+                }
+
+                if kind == StorageDevice::Hdd && rotational == "1"
+                    || kind == StorageDevice::Ssd && rotational == "0"
+                    || kind == StorageDevice::HddOrSsd
+                {
+                    devices.push(dev_str.to_string());
+                }
+            }
+            (Err(e), _) | (_, Err(e)) => {
+                error!("Unable to read device {dev_str} attributes: {e}");
+            }
+        }
+    }
+
+    devices.sort();
+    Ok(devices)
+}
+
+/// Retrieve temperature from NVMe or SDD/HDD with smartctl
+pub fn get_smartctl_disk_temperature(dev: &str) -> Result<Option<i32>, Box<dyn std::error::Error>> {
+    let temp_regex =
+        Regex::new(r"194\s+Temperature_Celsius\s+\S+\s+\S+\s+\S+\s+\S+\s+\S+\s+\S+\s+-\s+(\d+)")?;
+    let nvme_temp_regex = Regex::new(r"Temperature:\s+(\d+)\s")?;
+
+    let dev = format!("/dev/{}", dev);
+    match Command::new("sudo")
+        .arg("-n")
+        .arg("smartctl")
+        .arg("-A")
+        .arg(&dev)
+        .output()
+    {
+        Ok(output) => {
+            let stdout = String::from_utf8_lossy(&output.stdout);
+
+            if let Some(temp_captures) = temp_regex
+                .captures(&stdout)
+                .or_else(|| nvme_temp_regex.captures(&stdout))
+                && let Some(temp_match) = temp_captures.get(1)
+            {
+                let temperature = temp_match.as_str().parse::<i32>()?;
+                return Ok(Some(temperature));
+            }
+        }
+        Err(e) => {
+            error!("Device {dev} acquisition failed, error: {e}");
+        }
+    }
+
+    Ok(None)
+}
+
+/// Calculate actual filesystem usage rate of hard disk (based on df command)
+pub fn get_disk_usage(dev: &str) -> Result<DiskUsage, Box<dyn std::error::Error>> {
+    let mut tmp = DiskUsage {
+        usage_percent: 0.0,
+        total_used: 0,
+        total_size: 0,
+    };
+
+    // Get mounted partitions for this device
+    let cmd = format!(
+        "df -h --output=source,target,pcent | grep '/dev/{}[0-9]*'",
+        dev
+    );
+
+    match Command::new("sh").arg("-c").arg(&cmd).output() {
+        Ok(output) => {
+            if !output.status.success() {
+                return Ok(tmp);
+            }
+
+            let stdout = String::from_utf8_lossy(&output.stdout);
+            let mut total_used: u64 = 0;
+            let mut total_size: u64 = 0;
+
+            for line in stdout.lines() {
+                let line = line.trim();
+                if line.is_empty() {
+                    continue;
+                }
+
+                let parts: Vec<&str> = line.split_whitespace().collect();
+                if parts.len() < 3 {
+                    continue;
+                }
+
+                let mountpoint = parts[1];
+
+                // Get size in bytes
+                let size_cmd = format!(
+                    "df --block-size=1 {} | awk 'NR==2 {{print $2}}'",
+                    mountpoint
+                );
+                if let Ok(size_output) = Command::new("sh").arg("-c").arg(&size_cmd).output()
+                    && let Ok(size_str) = String::from_utf8(size_output.stdout)
+                    && let Ok(size) = size_str.trim().parse::<u64>()
+                {
+                    total_size += size;
+                }
+
+                // Get used space in bytes
+                let used_cmd = format!(
+                    "df --block-size=1 {} | awk 'NR==2 {{print $3}}'",
+                    mountpoint
+                );
+                if let Ok(used_output) = Command::new("sh").arg("-c").arg(&used_cmd).output()
+                    && let Ok(used_str) = String::from_utf8(used_output.stdout)
+                    && let Ok(used) = used_str.trim().parse::<u64>()
+                {
+                    total_used += used;
+                }
+            }
+
+            if total_size != 0 {
+                tmp.usage_percent =
+                    ((total_used as f64 / total_size as f64) * 100.0 * 100.0).round() / 100.0;
+                tmp.total_used = total_used;
+                tmp.total_size = total_size;
+            }
+
+            Ok(tmp)
+        }
+        Err(_) => Ok(tmp),
+    }
+}
+
+/// Format bytes into human-readable string
+pub fn format_bytes(bytes: u64) -> String {
+    const UNITS: &[&str] = &["B", "KB", "MB", "GB", "TB", "PB"];
+    const THRESHOLD: f64 = 1024.0;
+
+    if bytes == 0 {
+        return "0 B".to_string();
+    }
+
+    let mut size = bytes as f64;
+    let mut unit_index = 0;
+
+    while size >= THRESHOLD && unit_index < UNITS.len() - 1 {
+        size /= THRESHOLD;
+        unit_index += 1;
+    }
+
+    if unit_index > 0 {
+        format!("{:.2} {}", size, UNITS[unit_index])
+    } else {
+        format!("{} {}", size, UNITS[unit_index])
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_format_bytes() {
+        assert_eq!(format_bytes(0), "0 B");
+        assert_eq!(format_bytes(1024), "1.00 KB");
+        assert_eq!(format_bytes(1048576), "1.00 MB");
+        assert_eq!(format_bytes(1073741824), "1.00 GB");
+    }
+}
diff --git a/src/cfg.rs b/src/cfg.rs
index df98be0..67aebc4 100644
--- a/src/cfg.rs
+++ b/src/cfg.rs
@@ -6,6 +6,7 @@
 //! Derived from the available Monitor3.json file in AOOSTAR-X v1.3.4.
 //! Likely not fully compatible with files created with the original editor.
 
+use anyhow::Context;
 use image::Rgb;
 use imageproc::definitions::HasWhite;
 use log::warn;
@@ -15,10 +16,12 @@ use serde_repr::{Deserialize_repr, Serialize_repr};
 use std::io::BufReader;
 use std::num::ParseIntError;
 use std::ops::Deref;
+use std::path::Path;
 use std::{fmt, fs};
 
-pub fn load_cfg(path: &str) -> anyhow::Result<MonitorConfig> {
-    let file = fs::File::open(path)?;
+pub fn load_cfg<P: AsRef<Path>>(path: P) -> anyhow::Result<MonitorConfig> {
+    let path = path.as_ref();
+    let file = fs::File::open(path).with_context(|| format!("Failed to load config {path:?}"))?;
     let reader = BufReader::new(file);
     let config: MonitorConfig = serde_json::from_reader(reader)?;
 
@@ -30,8 +33,7 @@ pub fn load_cfg(path: &str) -> anyhow::Result<MonitorConfig> {
         let panel = &config.panels[active as usize - 1];
 
         println!(
-            "Panel {active}: type={}, {}",
-            panel.panel_type,
+            "Panel {active}: {}",
             panel.img.as_deref().unwrap_or_default()
         );
         for sensor in &panel.sensor {
@@ -55,28 +57,69 @@ pub fn load_cfg(path: &str) -> anyhow::Result<MonitorConfig> {
 /// AOOSTAR-X monitor json configuration file
 #[derive(Debug, Serialize, Deserialize)]
 pub struct MonitorConfig {
-    /// _Not used_
-    pub credentials: Option<Credentials>,
+    // _Not used_
+    // pub credentials: Option<Credentials>,
+    /// Configuration settings.
     pub setup: Setup,
-    /// Panels: 1-based index into diy[i]
+    /// Panels: 1-based index into `panels`
     #[serde(rename = "mianban")]
     pub active_panels: Vec<u32>,
     /// Custom panels / DIY "Do It Yourself",
     #[serde(rename = "diy")]
     pub panels: Vec<Panel>,
+    /// Internal index of the currently active panel. 1-based!
+    #[serde(skip)]
+    active_panel_idx: Option<usize>,
+}
+
+impl MonitorConfig {
+    pub fn get_next_active_panel(&mut self) -> Option<&Panel> {
+        let mut active_panel_idx = self.active_panel_idx.unwrap_or(0) + 1;
+        if active_panel_idx > self.panels.len() {
+            active_panel_idx = 1;
+        }
+
+        for (index, active) in self
+            .active_panels
+            .iter()
+            .filter(|&active| *active > 0)
+            .enumerate()
+        {
+            if *active > self.panels.len() as u32 {
+                warn!("Ignoring invalid active panel {active}");
+                continue;
+            }
+            if index + 1 == active_panel_idx {
+                self.active_panel_idx = Some(active_panel_idx);
+                return Some(&self.panels[*active as usize - 1]);
+            }
+        }
+
+        None
+    }
 }
 
 /// Web-app user login
+///
+/// Not used, part of AOOSTAR-X json configuration file.
 #[derive(Debug, Serialize, Deserialize)]
 pub struct Credentials {
     pub username: String,
     pub password: String,
 }
 
-/// Configuration Settings
+/// Configuration settings.
+///
+/// Note: Trimmed down object to include only required fields for `asterctl`.
 #[derive(Debug, Serialize, Deserialize)]
 #[serde(rename_all = "camelCase")]
 pub struct Setup {
+    /// Switch time between panels in seconds, interpreted as float and converted to milliseconds. Default: 5
+    pub switch_time: Option<String>, // existed as "30" string
+    /// Panel redraw interval in seconds. Default: 1
+    pub refresh: f32,
+    /*
+    // The following fields of the AOOSTAR-X json configuration file are NOT used in `asterctl`
     /// Default: true
     pub off_display: bool,
     /// Selection of default panels based on theme / control_params / control_disk_temp ?
@@ -89,8 +132,6 @@ pub struct Setup {
     pub custom_panel: bool,
     /// Language index. Default: 0
     pub language: Language,
-    /// Switch time between panels (?) in seconds, interpreted as int. Default: 5
-    pub switch_time: Option<String>, // existed as "30" string
     /// Operation mode: performance, power saving, etc.
     pub operation_mode: Option<OperationMode>,
     /// Operation type 1 or 2 (?). Default: 1
@@ -106,20 +147,25 @@ pub struct Setup {
     #[serde(deserialize_with = "empty_string_as_none")]
     #[serde(rename = "ha_token")]
     pub ha_token: Option<String>, // "" in JSON ⇒ Option<String>
-    /// Panel refresh in seconds. Default: 1
-    pub refresh: f32,
+    */
 }
 
+/// Language setting.
+///
+/// Not used, part of AOOSTAR-X json configuration file.
 #[derive(Debug, Serialize_repr, Deserialize_repr, PartialEq)]
 #[repr(u8)]
+#[allow(dead_code)]
 pub enum Language {
     Chinese = 0,
     English = 1,
     Japanese = 2,
 }
 
+/// Not used, part of AOOSTAR-X json configuration file.
 #[derive(Debug, Serialize_repr, Deserialize_repr, PartialEq)]
 #[repr(i16)]
+#[allow(dead_code)]
 pub enum OperationMode {
     None = -1,
     HighPerformance = 0,
@@ -137,11 +183,14 @@ pub struct Panel {
     pub id: Option<String>,
     /// Custom panel name
     pub name: Option<String>,
+    /*
+    // The following fields of the AOOSTAR-X json configuration file are NOT used in `asterctl`
     /// TODO
     pub checked: Option<bool>,
     /// TODO panel type: 5 = built-in? 6 = custom ?
     #[serde(rename = "type")]
     pub panel_type: i32,
+     */
     /// Background image filename
     pub img: Option<String>,
     /// Sensors
@@ -169,38 +218,47 @@ pub struct Sensor {
     pub name: Option<String>,
     /// Label name for custom panels.
     pub item_name: Option<String>,
-    /// TODO Data source?
+    /// Label identifier, also used as data source identifier.
     pub label: String,
-
-    /// x-position. Custom panel coordinates are stored as float!
-    pub x: f32,
-    /// x-position. TODO unit
-    pub y: f32,
-    pub width: Option<i32>,
-    pub height: Option<i32>,
-
-    pub text_direction: i32, // layout direction
-    pub direction: i32,      // sensor orientation, 0/1
-
+    /// Sensor value. Ignored: value is used from a sensor source
     #[serde(deserialize_with = "empty_string_as_none")]
     pub value: Option<String>, // "" or numbers, so Option<String>
-
-    pub font_family: String,
-    pub font_size: i32,
-    /// Font color in `#RRGGBB` notation, or -1 if not set. #ffffff = white, #ff0000 = red
-    pub font_color: FontColor,
-    pub font_weight: FontWeight,
-    pub text_align: TextAlign,
-
-    #[serde(deserialize_with = "option_none_if_minus_one")]
-    pub integer_digits: Option<i32>, // -1 ≈ unset ⇒ Option<i32>
-    #[serde(deserialize_with = "option_none_if_minus_one")]
-    pub decimal_digits: Option<i32>, // -1 ≈ unset ⇒ Option<i32>
-
     /// Optional unit text to print after the value
     #[serde(deserialize_with = "empty_string_as_none")]
     pub unit: Option<String>,
+    /// x-position. Custom panel coordinates are stored as float!
+    pub x: f32,
+    /// y-position.
+    pub y: f32,
+    /// _Not (yet) used_
+    pub width: Option<i32>,
+    /// _Not (yet) used_
+    pub height: Option<i32>,
+    /// _Not (yet) used_
+    pub text_direction: i32, // layout direction
+    /// _Not (yet) used_
+    pub direction: i32, // sensor orientation, 0/1
 
+    /// Font name matching font filename without file extension.
+    pub font_family: String,
+    /// TODO font size unit: points or pixels?
+    pub font_size: i32,
+    /// Font color in `#RRGGBB` notation, or -1 if not set. #ffffff = white, #ff0000 = red
+    pub font_color: FontColor,
+    /// _Not (yet) used_
+    pub font_weight: FontWeight,
+    pub text_align: TextAlign,
+
+    /// Number of integer places for the sensor value.
+    // -1 ≈ unset ⇒ Option<i32>
+    #[serde(deserialize_with = "option_none_if_minus_one")]
+    pub integer_digits: Option<i32>,
+    /// Number of decimal places for the sensor value.
+    // -1 ≈ unset ⇒ Option<i32>
+    #[serde(deserialize_with = "option_none_if_minus_one")]
+    pub decimal_digits: Option<i32>,
+    /*
+    // The following fields of the AOOSTAR-X json configuration file are NOT used in `asterctl`
     pub min_angle: i32,
     pub max_angle: i32,
     pub min_value: i32,
@@ -222,6 +280,7 @@ pub struct Sensor {
     pub data: Option<String>,
     /// For type = 6
     pub interval: Option<u32>,
+     */
 }
 
 #[derive(Debug, Serialize_repr, Deserialize_repr, PartialEq)]
diff --git a/src/display.rs b/src/display.rs
index 8c58363..043c551 100644
--- a/src/display.rs
+++ b/src/display.rs
@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: MIT OR Apache-2.0
 // SPDX-FileCopyrightText: Copyright (c) 2025 Markus Zehnder
 
+use crate::dummy_serialport::DummySerialPort;
 use crate::img::rgb888_to_565;
 use anyhow::{Context, anyhow};
 use bytes::{BufMut, BytesMut};
@@ -65,6 +66,16 @@ impl AooScreenBuilder {
         self.open_usb(USB_UART_VID, USB_UART_PID)
     }
 
+    /// Simulate the LCD device. No real device or serial port is required.
+    pub fn simulate(self) -> anyhow::Result<AooScreen> {
+        Ok(AooScreen {
+            port: Some(Box::new(DummySerialPort::new())),
+            enable_cache: self.enable_cache.unwrap_or(true),
+            prev_frame: None,
+            no_init_check: self.no_init_check.unwrap_or(false),
+        })
+    }
+
     /// Open the specified USB UART device id. Format: vid:pid
     pub fn open_usb_id(self, id: &str) -> anyhow::Result<AooScreen> {
         let (vid, pid) = id
@@ -276,10 +287,11 @@ pub fn find_usb_serial_port(vid: u16, pid: u16) -> serialport::Result<String> {
     let ports = serialport::available_ports()?;
     for p in ports {
         debug!("Found serial port: {}", p.port_name);
-        if let SerialPortType::UsbPort(info) = p.port_type {
-            if info.pid == pid && info.vid == vid {
-                return Ok(p.port_name);
-            }
+        if let SerialPortType::UsbPort(info) = p.port_type
+            && info.pid == pid
+            && info.vid == vid
+        {
+            return Ok(p.port_name);
         }
     }
 
diff --git a/src/dummy_serialport.rs b/src/dummy_serialport.rs
new file mode 100644
index 0000000..849d79b
--- /dev/null
+++ b/src/dummy_serialport.rs
@@ -0,0 +1,158 @@
+// SPDX-License-Identifier: MIT OR Apache-2.0
+// SPDX-FileCopyrightText: Copyright (c) 2025 Markus Zehnder
+
+use serialport::{ClearBuffer, DataBits, FlowControl, Parity, SerialPort, StopBits};
+use std::thread::sleep;
+use std::time::Duration;
+
+pub struct DummySerialPort {
+    baud_rate: u32,
+    data_bits: DataBits,
+    flow_control: FlowControl,
+    parity: Parity,
+    stop_bits: StopBits,
+    timeout: Duration,
+}
+
+impl DummySerialPort {
+    pub fn new() -> DummySerialPort {
+        Self {
+            baud_rate: 1_500_000,
+            data_bits: DataBits::Eight,
+            flow_control: FlowControl::None,
+            parity: Parity::None,
+            stop_bits: StopBits::One,
+            timeout: Default::default(),
+        }
+    }
+}
+
+impl std::io::Read for DummySerialPort {
+    fn read(&mut self, buf: &mut [u8]) -> std::io::Result<usize> {
+        buf[0] = b'A';
+        Ok(1)
+    }
+}
+
+impl std::io::Write for DummySerialPort {
+    fn write(&mut self, buf: &[u8]) -> std::io::Result<usize> {
+        // just some approximation, additional overhead like flushing etc is not considered
+        let byte_rate =
+            self.baud_rate / (1 + u8::from(self.data_bits) + u8::from(self.stop_bits)) as u32;
+        let delay = Duration::from_micros((buf.len() * 1000 * 1000 / byte_rate as usize) as u64);
+        sleep(delay);
+        Ok(buf.len())
+    }
+
+    fn flush(&mut self) -> std::io::Result<()> {
+        Ok(())
+    }
+}
+
+impl SerialPort for DummySerialPort {
+    fn name(&self) -> Option<String> {
+        Some("Dummy Serial".into())
+    }
+
+    fn baud_rate(&self) -> serialport::Result<u32> {
+        Ok(self.baud_rate)
+    }
+
+    fn data_bits(&self) -> serialport::Result<DataBits> {
+        Ok(self.data_bits)
+    }
+
+    fn flow_control(&self) -> serialport::Result<FlowControl> {
+        Ok(self.flow_control)
+    }
+
+    fn parity(&self) -> serialport::Result<Parity> {
+        Ok(self.parity)
+    }
+
+    fn stop_bits(&self) -> serialport::Result<StopBits> {
+        Ok(self.stop_bits)
+    }
+
+    fn timeout(&self) -> Duration {
+        self.timeout
+    }
+
+    fn set_baud_rate(&mut self, baud_rate: u32) -> serialport::Result<()> {
+        self.baud_rate = baud_rate;
+        Ok(())
+    }
+
+    fn set_data_bits(&mut self, data_bits: DataBits) -> serialport::Result<()> {
+        self.data_bits = data_bits;
+        Ok(())
+    }
+
+    fn set_flow_control(&mut self, flow_control: FlowControl) -> serialport::Result<()> {
+        self.flow_control = flow_control;
+        Ok(())
+    }
+
+    fn set_parity(&mut self, parity: Parity) -> serialport::Result<()> {
+        self.parity = parity;
+        Ok(())
+    }
+
+    fn set_stop_bits(&mut self, stop_bits: StopBits) -> serialport::Result<()> {
+        self.stop_bits = stop_bits;
+        Ok(())
+    }
+
+    fn set_timeout(&mut self, timeout: Duration) -> serialport::Result<()> {
+        self.timeout = timeout;
+        Ok(())
+    }
+
+    fn write_request_to_send(&mut self, _level: bool) -> serialport::Result<()> {
+        Ok(())
+    }
+
+    fn write_data_terminal_ready(&mut self, _level: bool) -> serialport::Result<()> {
+        Ok(())
+    }
+
+    fn read_clear_to_send(&mut self) -> serialport::Result<bool> {
+        Ok(true)
+    }
+
+    fn read_data_set_ready(&mut self) -> serialport::Result<bool> {
+        Ok(true)
+    }
+
+    fn read_ring_indicator(&mut self) -> serialport::Result<bool> {
+        Ok(false)
+    }
+
+    fn read_carrier_detect(&mut self) -> serialport::Result<bool> {
+        Ok(false)
+    }
+
+    fn bytes_to_read(&self) -> serialport::Result<u32> {
+        Ok(1)
+    }
+
+    fn bytes_to_write(&self) -> serialport::Result<u32> {
+        Ok(0)
+    }
+
+    fn clear(&self, _buffer_to_clear: ClearBuffer) -> serialport::Result<()> {
+        Ok(())
+    }
+
+    fn try_clone(&self) -> serialport::Result<Box<dyn SerialPort>> {
+        todo!()
+    }
+
+    fn set_break(&self) -> serialport::Result<()> {
+        Ok(())
+    }
+
+    fn clear_break(&self) -> serialport::Result<()> {
+        Ok(())
+    }
+}
diff --git a/src/format_value.rs b/src/format_value.rs
new file mode 100644
index 0000000..39be26e
--- /dev/null
+++ b/src/format_value.rs
@@ -0,0 +1,200 @@
+// SPDX-License-Identifier: MIT OR Apache-2.0
+// SPDX-FileCopyrightText: Copyright (c) 2025 Markus Zehnder
+
+//! Sensor value format functions based on the AOOSTAR-X application.
+
+#[derive(Debug, Clone)]
+pub enum IntegerDigits {
+    /// Keep all integer digits
+    Auto, // -1 in Python
+    /// Only keep the integer part of a decimal number
+    Zero, // 0 in Python
+    /// Limit integer part of a decimal number to the given length
+    Fixed(usize), // positive values
+}
+
+impl From<i32> for IntegerDigits {
+    fn from(value: i32) -> Self {
+        match value {
+            -1 => IntegerDigits::Auto,
+            0 => IntegerDigits::Zero,
+            n if n > 0 => IntegerDigits::Fixed(n as usize),
+            _ => IntegerDigits::Auto,
+        }
+    }
+}
+
+impl From<Option<i32>> for IntegerDigits {
+    fn from(value: Option<i32>) -> Self {
+        match value {
+            None => IntegerDigits::Auto,
+            Some(digits) => IntegerDigits::from(digits),
+        }
+    }
+}
+
+/// Format a sensor value in string format to the specified fixed point number.
+///
+/// # Arguments
+///
+/// * `value`: decimal number to format
+/// * `integer_digits`: number of integer places
+/// * `decimal_digits`: fixed point numbers
+/// * `unit`: unit suffix to append after the formatted number
+///
+/// returns: String
+///
+/// # Examples
+///
+/// ```
+/// let value = format_value("123.456", IntegerDigits::Auto, 0, "foobar");
+/// assert_eq!(value, "123foobar");
+/// ```
+pub fn format_value(
+    value: &str,
+    integer_digits: IntegerDigits,
+    decimal_digits: usize,
+    unit: &str,
+) -> String {
+    let num = match value.parse::<f64>() {
+        Ok(n) => n,
+        Err(_) => return format!("{}{}", value, unit),
+    };
+
+    // Round number to the specified decimal digits
+    let factor = 10f64.powi(decimal_digits as i32);
+    let rounded = if decimal_digits == 0 {
+        num.round()
+    } else {
+        (num * factor).round() / factor
+    };
+
+    // Get integer and decimal parts
+    // The integer part may increase due to rounding!
+    let integer_part = rounded.trunc() as i64;
+    let decimal_part = if decimal_digits > 0 {
+        let mut dec = (rounded.fract().abs() * factor).round() as u64;
+        // Handle cases where rounding makes the decimal part equal to factor
+        if dec == factor as u64 {
+            // e.g. 9.999 rounded to 1 decimal = 10.0
+            // We set decimal part to 0
+            dec = 0;
+        }
+        format!("{:0width$}", dec, width = decimal_digits)
+    } else {
+        "".to_string()
+    };
+
+    // Format integer part according to padding rules
+    let integer_str = integer_part.to_string();
+    let integer_filled = match integer_digits {
+        IntegerDigits::Auto => integer_str.clone(),
+        IntegerDigits::Zero => "".to_string(),
+        IntegerDigits::Fixed(digits) => {
+            if integer_str.len() > digits {
+                "9".repeat(digits)
+            } else {
+                format!("{:0width$}", integer_part, width = digits)
+            }
+        }
+    };
+
+    let formatted = if decimal_digits > 0 {
+        format!("{}.{}", integer_filled, decimal_part)
+    } else {
+        integer_filled
+    };
+
+    format!("{}{}", formatted, unit)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use rstest::rstest;
+
+    #[rstest]
+    #[case(5, 2, "00123.46°C")]
+    #[case(5, 1, "00123.5°C")]
+    #[case(5, 0, "00123°C")]
+    #[case(-1, 2, "123.46°C")]
+    #[case(-1, 1, "123.5°C")]
+    #[case(-1, 0, "123°C")]
+    #[case(2, 0, "99°C")]
+    fn test_format_value_with_decimal(
+        #[case] digits: i32,
+        #[case] decimals: usize,
+        #[case] output: &str,
+    ) {
+        let result = format_value("123.456", IntegerDigits::from(digits), decimals, "°C");
+        assert_eq!(output, result);
+    }
+
+    #[rstest]
+    #[case(5, 2, "00123.00°C")]
+    #[case(5, 1, "00123.0°C")]
+    #[case(5, 0, "00123°C")]
+    #[case(-1, 2, "123.00°C")]
+    #[case(-1, 1, "123.0°C")]
+    #[case(-1, 0, "123°C")]
+    #[case(2, 0, "99°C")]
+    fn test_format_value_with_integer(
+        #[case] digits: i32,
+        #[case] decimals: usize,
+        #[case] output: &str,
+    ) {
+        let result = format_value("123", IntegerDigits::from(digits), decimals, "°C");
+        assert_eq!(output, result);
+    }
+
+    #[rstest]
+    #[case(5, 2, "-0123.00°C")]
+    #[case(5, 0, "-0123°C")]
+    #[case(-1, 2, "-123.00°C")]
+    #[case(-1, 1, "-123.0°C")]
+    #[case(-1, 0, "-123°C")]
+    #[case(2, 0, "99°C")] // Overflow
+    fn test_format_value_with_negative_integer(
+        #[case] digits: i32,
+        #[case] decimals: usize,
+        #[case] output: &str,
+    ) {
+        let result = format_value("-123", IntegerDigits::from(digits), decimals, "°C");
+        assert_eq!(output, result);
+    }
+
+    #[rstest]
+    #[case("0", 3, 1, "V", "000.0V")]
+    #[case("999.99", 2, 1, "%", "99.0%")]
+    #[case("invalid", 2, 2, "unit", "invalidunit")]
+    fn test_format_value_edge_cases(
+        #[case] input: &str,
+        #[case] digits: i32,
+        #[case] decimals: usize,
+        #[case] unit: &str,
+        #[case] output: &str,
+    ) {
+        let result = format_value(input, IntegerDigits::from(digits), decimals, unit);
+        assert_eq!(output, result);
+    }
+
+    #[rstest]
+    #[case("1.999", 2, 1, "", "02.0")]
+    #[case("1.999", 2, 0, "", "02")]
+    #[case("1.999", 1, 1, "", "2.0")]
+    #[case("1.999", -1, 1, "", "2.0")]
+    #[case("0.999", 1, 2, "", "1.00")]
+    #[case("0.999", 1, 1, "", "1.0")]
+    #[case("0.999", 1, 0, "", "1")]
+    #[case("123.6", -1, 0, "", "124")]
+    fn test_format_value_rounding(
+        #[case] input: &str,
+        #[case] digits: i32,
+        #[case] decimals: usize,
+        #[case] unit: &str,
+        #[case] output: &str,
+    ) {
+        let result = format_value(input, IntegerDigits::from(digits), decimals, unit);
+        assert_eq!(output, result);
+    }
+}
diff --git a/src/main.rs b/src/main.rs
index 93cbe8b..7a261f3 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -3,21 +3,31 @@
 
 mod cfg;
 mod display;
+mod dummy_serialport;
 mod font;
+mod format_value;
 mod img;
+mod sensors;
 
-use crate::cfg::Panel;
+use crate::cfg::{MonitorConfig, Panel, SensorMode, TextAlign};
 use crate::display::{AooScreen, AooScreenBuilder, DISPLAY_SIZE};
 use crate::font::FontHandler;
+use crate::format_value::format_value;
+use crate::sensors::start_file_slurper;
 use ab_glyph::{Font, PxScale};
+use anyhow::anyhow;
 use clap::Parser;
 use env_logger::Env;
 use image::imageops::FilterType;
 use image::{ImageReader, Rgb, RgbImage};
-use imageproc::drawing::{draw_line_segment_mut, draw_text_mut};
-use log::{debug, info, warn};
+use imageproc::drawing::{draw_line_segment_mut, draw_text_mut, text_size};
+use log::{debug, error, info};
+use std::collections::HashMap;
 use std::fs;
 use std::io::Cursor;
+use std::path::{Path, PathBuf};
+use std::str::FromStr;
+use std::sync::{Arc, RwLock};
 use std::thread::sleep;
 use std::time::{Duration, Instant};
 
@@ -45,14 +55,31 @@ struct Args {
     #[arg(short, long)]
     image: Option<String>,
 
+    /// AOOSTAR-X json configuration file to parse.
+    ///
+    /// The configuration file will be loaded from the `config_dir` directory if no full path is
+    /// specified.
+    #[arg(short, long)]
+    config: Option<PathBuf>,
+
+    /// Configuration directory containing configuration files and background images
+    /// specified in the `config` file. Default: `./cfg`
+    #[arg(long)]
+    config_dir: Option<PathBuf>,
+
+    /// Font directory for fonts specified in the `config` file. Default: `./fonts`
+    #[arg(long)]
+    font_dir: Option<PathBuf>,
+
+    /// Single sensor value input file or directory for multiple sensor input files.
+    /// Default: `./cfg/sensors`
+    #[arg(long)]
+    sensor_path: Option<PathBuf>,
+
     /// Run a demo
     #[arg(long)]
     demo: bool,
 
-    /// Only for demo mode: AOOSTAR-X json configuration file to parse.
-    #[arg(short, long)]
-    config: Option<String>,
-
     /// Switch off display n seconds after loading image or running demo.
     #[arg(short, long)]
     off_after: Option<u32>,
@@ -64,20 +91,23 @@ struct Args {
     /// Test mode: save changed images in ./out folder.
     #[arg(short, long)]
     save: bool,
+
+    /// Simulate serial port for testing and development, `--device` and `--usb` options are ignored.
+    #[arg(long)]
+    simulate: bool,
 }
 
 fn main() -> anyhow::Result<()> {
     env_logger::Builder::from_env(Env::default().default_filter_or("info")).init();
 
     let args = Args::parse();
-    if let Some(config) = args.config.as_ref() {
-        let _cfg = cfg::load_cfg(config)?;
-    }
 
     // initialize display with given UART port parameter
     let mut builder = AooScreenBuilder::new();
     builder.no_init_check(args.write_only);
-    let mut screen = if let Some(device) = args.device {
+    let mut screen = if args.simulate {
+        builder.simulate()?
+    } else if let Some(device) = args.device {
         builder.open_device(&device)?
     } else if let Some(usb) = args.usb {
         builder.open_usb_id(&usb)?
@@ -97,6 +127,31 @@ fn main() -> anyhow::Result<()> {
     // switch on screen for remaining commands
     screen.init()?;
 
+    if !args.demo
+        && let Some(config) = args.config
+    {
+        info!("Starting sensor panel mode");
+        let img_save_path = if args.save {
+            let img_save_path = PathBuf::from("out");
+            fs::create_dir_all(&img_save_path)?;
+            Some(img_save_path)
+        } else {
+            None
+        };
+
+        let cfg_dir = args.config_dir.unwrap_or_else(|| "cfg".into());
+        let cfg = load_configuration(&config, &cfg_dir)?;
+        run_sensor_panel(
+            &mut screen,
+            cfg,
+            cfg_dir,
+            args.font_dir.unwrap_or_else(|| "fonts".into()),
+            args.sensor_path.unwrap_or_else(|| "cfg/sensors".into()),
+            img_save_path,
+        )?;
+        return Ok(());
+    }
+
     if let Some(image) = args.image {
         info!("Loading and displaying background image {image}...");
         let rgb_img = img::load_image(&image, DISPLAY_SIZE)?;
@@ -107,7 +162,13 @@ fn main() -> anyhow::Result<()> {
 
     if args.demo {
         info!("Loading and displaying demo...");
-        run_demo(&mut screen, args.config.as_deref(), args.save)?;
+        run_demo(
+            &mut screen,
+            args.config.as_deref(),
+            args.config_dir.unwrap_or_else(|| "cfg".into()),
+            args.font_dir.unwrap_or_else(|| "fonts".into()),
+            args.save,
+        )?;
     }
 
     if let Some(off) = args.off_after {
@@ -121,7 +182,115 @@ fn main() -> anyhow::Result<()> {
     Ok(())
 }
 
-fn run_demo(screen: &mut AooScreen, config: Option<&str>, save_images: bool) -> anyhow::Result<()> {
+fn load_configuration<P: AsRef<Path>>(config: P, config_dir: P) -> anyhow::Result<MonitorConfig> {
+    let config = config.as_ref();
+    let config_dir = config_dir.as_ref();
+
+    if config.is_absolute() {
+        cfg::load_cfg(config)
+    } else {
+        cfg::load_cfg(config_dir.join(config))
+    }
+}
+
+fn run_sensor_panel<P: AsRef<Path>, B: Into<PathBuf>>(
+    screen: &mut AooScreen,
+    mut cfg: MonitorConfig,
+    config_dir: B,
+    font_dir: B,
+    sensor_path: B,
+    img_save_path: Option<P>,
+) -> anyhow::Result<()> {
+    let config_dir = config_dir.into();
+    let sensor_values: Arc<RwLock<HashMap<String, String>>> = Arc::new(RwLock::new(HashMap::new()));
+    let mut fh = FontHandler::new(font_dir);
+
+    let mut rgb_img;
+    let mut save_img_name;
+
+    start_file_slurper(sensor_path, sensor_values.clone())?;
+
+    let refresh = Duration::from_millis((cfg.setup.refresh * 1000f32) as u64);
+
+    let switch_time = cfg
+        .setup
+        .switch_time
+        .as_deref()
+        .and_then(|v| f32::from_str(v).ok())
+        .map(|v| Duration::from_millis((v * 1000.0) as u64))
+        .unwrap_or(Duration::from_secs(5));
+
+    // panel switching loop
+    loop {
+        let panel = cfg
+            .get_next_active_panel()
+            .ok_or(anyhow!("No active panel"))?;
+
+        if let Some(img_file) = &panel.img {
+            let img_file = PathBuf::from(img_file);
+            save_img_name = img_file
+                .file_stem()
+                .map(|s| s.to_string_lossy().to_string());
+            let file = if img_file.is_absolute() {
+                img_file
+            } else {
+                config_dir.join(img_file)
+            };
+            info!("Loading panel image {file:?}...");
+            rgb_img = img::load_image(&file, DISPLAY_SIZE)?;
+        } else {
+            save_img_name = None;
+            rgb_img = RgbImage::new(DISPLAY_SIZE.0, DISPLAY_SIZE.1);
+        }
+
+        let panel_switch_time = Instant::now();
+
+        // active panel refresh loop
+        let mut refresh_count = 1;
+        loop {
+            let upd_start_time = Instant::now();
+
+            let out_filename = if let Some(save_path) = &img_save_path {
+                let save_path = save_path.as_ref();
+                Some(save_path.join(format!(
+                    "{}-{refresh_count:02}.png",
+                    save_img_name.as_deref().unwrap_or("panel")
+                )))
+            } else {
+                None
+            };
+
+            update_panel(
+                screen,
+                &rgb_img,
+                &mut fh,
+                panel,
+                sensor_values.clone(),
+                out_filename,
+            )?;
+
+            let elapsed = upd_start_time.elapsed();
+            if refresh > elapsed {
+                sleep(refresh - elapsed);
+            }
+
+            if panel_switch_time.elapsed() >= switch_time {
+                info!("Switching panels");
+                break;
+            }
+
+            refresh_count += 1;
+        }
+    }
+}
+
+fn run_demo(
+    screen: &mut AooScreen,
+    config: Option<&Path>,
+    config_dir: PathBuf,
+    font_dir: PathBuf,
+    save_images: bool,
+) -> anyhow::Result<()> {
     let rgb_img = demo_image()?;
 
     // fill left and right side of the loaded image with neighboring pixel color
@@ -132,15 +301,38 @@ fn run_demo(screen: &mut AooScreen, config: Option<&str>, save_images: bool) ->
     demo_text(screen, &rgb_img, save_images)?;
 
     if let Some(config) = config {
-        let cfg = cfg::load_cfg(config)?;
-        for active in cfg.active_panels.clone() {
-            if active == 0 || active > cfg.panels.len() as u32 {
-                warn!("Ignoring invalid active panel {active}");
-                continue;
+        let mut cfg = load_configuration(config, &config_dir)?;
+
+        if let Some(panel) = cfg.get_next_active_panel() {
+            info!("Displaying demo panel...");
+
+            // get sensor values from panel configuration
+            let mut demo_values = HashMap::new();
+            for sensor in &panel.sensor {
+                demo_values.insert(
+                    sensor.label.clone(),
+                    sensor.value.clone().unwrap_or_default(),
+                );
             }
-            let panel = &cfg.panels[active as usize - 1];
-            demo_panel(screen, &rgb_img, panel, save_images)?;
-            break;
+
+            let mut fh = FontHandler::new(font_dir);
+            let out_filename = if save_images {
+                fs::create_dir_all("out")?;
+                Some("out/demo_panel.png")
+            } else {
+                None
+            };
+
+            update_panel(
+                screen,
+                &rgb_img,
+                &mut fh,
+                panel,
+                Arc::new(RwLock::new(demo_values)),
+                out_filename,
+            )?;
+        } else {
+            error!("No active panel found");
         }
     }
 
@@ -268,50 +460,88 @@ fn demo_blinds(
     Ok(rgb_img)
 }
 
-fn demo_panel(
+fn update_panel<P: AsRef<Path>>(
     screen: &mut AooScreen,
     background: &RgbImage,
+    fh: &mut FontHandler,
     panel: &Panel,
-    save_image: bool,
+    values: Arc<RwLock<HashMap<String, String>>>,
+    img_save_path: Option<P>,
 ) -> anyhow::Result<()> {
-    info!("Displaying panel information...");
+    debug!(
+        "Displaying panel {}...",
+        panel
+            .name
+            .as_deref()
+            .unwrap_or_else(|| panel.id.as_deref().unwrap_or_default())
+    );
 
     let mut rgb_img = background.clone();
 
-    let mut fh = FontHandler::new("fonts");
-
     for sensor in &panel.sensor {
-        println!(
-            "({:03},{:03}): {}{}",
-            sensor.x,
-            sensor.y,
-            sensor.value.as_deref().unwrap_or_default(),
-            sensor.unit.as_deref().unwrap_or_default()
-        );
+        if sensor.mode != SensorMode::Text {
+            debug!(
+                "Skipping sensor {}: unsupported sensor mode {:?}",
+                sensor.label, sensor.mode
+            );
+            continue;
+        }
 
-        if let Some(value) = &sensor.value {
+        let values = values.read().expect("RwLock is poisoned");
+        let value = values.get(&sensor.label).cloned();
+        let unit = values
+            .get(&format!("{}#unit", sensor.label))
+            .cloned()
+            .or_else(|| sensor.unit.clone())
+            .unwrap_or_default();
+        drop(values);
+
+        if let Some(value) = value {
             let font = fh.get_ttf_font_or_default(&sensor.font_family);
+            // TODO verify pixel scaling! Is font_size point size or pixel size?
+            // This is still a bit off compared to the original AOOSTAR-X. Only tested with HarmonyOS_Sans_SC_Bold!
+            let adjustment_hack = 0.7;
+            let scale = font
+                .pt_to_px_scale(sensor.font_size as f32 * adjustment_hack)
+                .unwrap();
+
+            let text = format_value(
+                &value,
+                sensor.integer_digits.into(),
+                sensor.decimal_digits.unwrap_or_default() as usize,
+                &unit,
+            );
+            let size = text_size(scale, &font, &text);
+            // TODO verify x & y-coordinate handling
+            let x = match sensor.text_align {
+                TextAlign::Left => sensor.x as i32,
+                TextAlign::Center => sensor.x as i32 - (size.0 / 2) as i32,
+                TextAlign::Right => sensor.x as i32 - size.0 as i32,
+            };
+            let y = (sensor.y - scale.y / 2f32) as i32;
+            // let y = sensor.y as i32 - (size.1 / 2) as i32;
+
+            debug!(
+                "Sensor({:03},{:03}), pixel({x:03},{y:03}), size{size:?}: {text}",
+                sensor.x, sensor.y
+            );
 
-            let text = format!("{value}{}", sensor.unit.as_deref().unwrap_or_default());
-            let scale = font.pt_to_px_scale(sensor.font_size as f32).unwrap();
             draw_text_mut(
                 &mut rgb_img,
                 sensor.font_color.into(),
-                // TODO figure out x,y unit conversion, something is off, probably in font scaling
-                sensor.x as i32,
-                sensor.y as i32,
+                x,
+                y,
                 scale,
                 &font,
                 &text,
             );
-
-            screen.send_image(&rgb_img)?;
         }
     }
 
-    if save_image {
-        fs::create_dir_all("out")?;
-        rgb_img.save_with_format("out/panel.png", image::ImageFormat::Png)?;
+    screen.send_image(&rgb_img)?;
+
+    if let Some(path) = img_save_path {
+        rgb_img.save_with_format(path, image::ImageFormat::Png)?;
     }
 
     Ok(())
diff --git a/src/sensors.rs b/src/sensors.rs
new file mode 100644
index 0000000..568df87
--- /dev/null
+++ b/src/sensors.rs
@@ -0,0 +1,169 @@
+// SPDX-License-Identifier: MIT OR Apache-2.0
+// SPDX-FileCopyrightText: Copyright (c) 2025 Markus Zehnder
+
+//! Sensor value sources.
+//!
+//! Only implementation is a file-based value provider with simple key-value pairs.
+
+use log::{debug, error, info, warn};
+use notify::event::{ModifyKind, RenameMode};
+use notify::{Event, EventKind, RecursiveMode, Watcher};
+use std::collections::HashMap;
+use std::fs;
+use std::io::{BufRead, BufReader};
+use std::ops::DerefMut;
+use std::path::{Path, PathBuf};
+use std::process::exit;
+use std::sync::{Arc, RwLock, mpsc};
+
+/// Read all sensor value source files from the given path and stort monitoring for changes.
+///
+/// The source path is either a single sensor source file or a directory containing multiple sensor
+/// source files.
+///
+/// The source path is monitored for changes in a separate thread.
+/// All updated files are automatically read and stored in the shared HashMap.
+///
+/// # Arguments
+///
+/// * `source_path`: Single source file path or a directory path.
+/// * `values`: a shared, reader-writer lock protected HashMap
+///
+/// returns: Result<(), Error>
+pub fn start_file_slurper<P: Into<PathBuf>>(
+    source_path: P,
+    values: Arc<RwLock<HashMap<String, String>>>,
+) -> anyhow::Result<()> {
+    let dir_path = source_path.into();
+    // read existing file(s)
+    {
+        let mut val = values.write().expect("Failed to lock values");
+        read_path(&dir_path, val.deref_mut())?;
+    }
+
+    let file_values = values.clone();
+
+    std::thread::spawn(move || {
+        // watch sensor file/directory for changes
+        let (tx, rx) = mpsc::channel::<notify::Result<Event>>();
+        let mut watcher = match notify::recommended_watcher(tx) {
+            Ok(w) => w,
+            Err(e) => {
+                error!("Failed to initialize watcher: {e}");
+                exit(1);
+            }
+        };
+
+        info!("Starting sensor file watcher for {dir_path:?}");
+        if let Err(e) = watcher.watch(&dir_path, RecursiveMode::NonRecursive) {
+            error!("Failed to start file watcher: {e}");
+            exit(1);
+        }
+
+        // Block forever, printing out events as they come in
+        for res in rx {
+            let event = match res {
+                Ok(event) => event,
+                Err(e) => {
+                    warn!("watch error: {e:?}");
+                    continue;
+                }
+            };
+            match event.kind {
+                EventKind::Modify(kind)
+                    if matches!(kind, ModifyKind::Data(_) | ModifyKind::Name(RenameMode::To)) =>
+                {
+                    for path in event.paths.iter() {
+                        if path.extension().unwrap_or_default() != "txt" {
+                            continue;
+                        }
+                        debug!("Modified sensor file ({kind:?}): {path:?}");
+                        let mut val = file_values.write().expect("Poisoned sensor RwLock");
+
+                        if let Err(e) = read_from_file(path, val.deref_mut()) {
+                            warn!("Failed to read sensor file {path:?}: {e}");
+                            continue;
+                        }
+                    }
+                }
+                _ => {
+                    // just for debugging
+                    debug!("Watch event {:?}: {:?}", event.kind, event.paths);
+                }
+            }
+        }
+    });
+
+    Ok(())
+}
+
+/// Read a single key-value-based source file or all source file for a given directory path.
+///
+/// # Arguments
+///
+/// * `path`: Single source file path or a directory path.
+/// * `values`: HashMap to store all read key-value pairs.
+///
+/// returns: Result<(), Error>
+fn read_path<P: AsRef<Path>>(path: P, values: &mut HashMap<String, String>) -> anyhow::Result<()> {
+    let path = path.as_ref();
+
+    if !path.try_exists()? {
+        return Ok(());
+    }
+
+    if path.is_file() {
+        return read_from_file(path, values);
+    }
+
+    for entry in fs::read_dir(path)? {
+        let path = entry?.path();
+
+        if path.is_file()
+            && path.extension().unwrap_or_default() == "txt"
+            && let Err(e) = read_from_file(&path, values)
+        {
+            warn!("Failed to read sensor file {path:?}: {e}");
+        }
+    }
+
+    Ok(())
+}
+
+/// Read a key-value-based sensor source file and store content in the provided hashmap.
+///
+/// - Empty lines are skipped
+/// - Lines starting with # are skipped
+/// - Key-value pairs must be separated by `:`
+/// - All keys and values are trimmed
+///
+/// # Arguments
+///
+/// * `path`: file path to read
+/// * `values`: HashMap to store read key-value pairs.
+///
+/// returns: Result<(), Error>
+fn read_from_file<P: AsRef<Path>>(
+    path: P,
+    values: &mut HashMap<String, String>,
+) -> anyhow::Result<()> {
+    debug!("Reading sensor file {:?}", path.as_ref());
+
+    let file = fs::File::open(path)?;
+    let reader = BufReader::new(file);
+
+    for line in reader.lines() {
+        let line = line?;
+        let line = line.trim();
+        if line.is_empty() || line.starts_with('#') {
+            continue;
+        }
+        if let Some((key, value)) = line.split_once(':') {
+            values.insert(key.trim().to_string(), value.trim().to_string());
+        } else {
+            warn!("Skipping invalid entry in sensor value file: {line}");
+        }
+    }
+
+    Ok(())
+}