diff --git a/.github/workflows/LibraryBuild.yml b/.github/workflows/LibraryBuild.yml
index 743b2d3..ff2ebc9 100644
--- a/.github/workflows/LibraryBuild.yml
+++ b/.github/workflows/LibraryBuild.yml
@@ -10,26 +10,26 @@
 
 # This is the name of the workflow, visible on GitHub UI.
 name: LibraryBuild
-on: [push, pull_request] # see: https://help.github.com/en/actions/reference/events-that-trigger-workflows#pull-request-event-pull_request
+on:
+  push: # see: https://help.github.com/en/actions/reference/events-that-trigger-workflows#pull-request-event-pull_request
+    paths:
+    - '**.ino'
+    - '**.cpp'
+    - '**.h'
+    - '**LibraryBuild.yml'
+  pull_request:
 
 jobs:
   build:
     name: ${{ matrix.arduino-boards-fqbn }} - test compiling examples
 
-    runs-on: ubuntu-latest # I picked Ubuntu to use shell scripts.
+    runs-on: ubuntu-18.04 # I picked Ubuntu to use shell scripts.
 
     env:
-      # Space separated list without double quotes around the list. 
-      # If you need a library with a space in its name, like Adafruit NeoPixel or Adafruit INA219, you must use double quotes
-      # around the name and have at least 2 entries, where the first must be without double quotes! You may use Servo as dummy entry.
+      # Comma separated list without double quotes around the list.
+      PLATFORM_DEFAULT_URL: https://raw.githubusercontent.com/sparkfun/Arduino_Boards/master/IDE_Board_Manager/package_sparkfun_index.json
       REQUIRED_LIBRARIES: EspSoftwareSerial
 
-      # Global color definitions for output colors
-      RED: '\033[0;31m'
-      GREEN: '\033[0;32m'
-      YELLOW: '\033[1;33m'
-      BLUE: '\033[0;34m'
-
     strategy:
       matrix:
         # The matrix will produce one job for each configuration parameter of type `arduino-boards-fqbn`
@@ -47,6 +47,7 @@ jobs:
           - arduino:avr:leonardo
           - arduino:avr:mega
           - arduino:sam:arduino_due_x
+          - SparkFun:apollo3:amap3redboard
           - esp8266:esp8266:huzzah:eesz=4M3M,xtal=80
           - esp32:esp32:featheresp32:FlashFreq=80
           - STM32:stm32:GenF1:pnum=BLUEPILL_F103C8
@@ -57,31 +58,17 @@ jobs:
         # You may exclude specific examples for a board with examples-exclude: Use a space separated list.
         #############################################################################################################
         include:
-          - arduino-boards-fqbn: arduino:avr:uno
-            platform: arduino:avr
-
-          - arduino-boards-fqbn: arduino:avr:leonardo
-            platform: arduino:avr
-
-          - arduino-boards-fqbn: arduino:avr:mega
-            platform: arduino:avr
-
           - arduino-boards-fqbn: arduino:sam:arduino_due_x
-            platform: arduino:sam
             examples-exclude: Example5_LCDDemo # No SoftwareSerial available. Space separated list of (unique substrings of) example names to exclude in build
 
           - arduino-boards-fqbn: esp8266:esp8266:huzzah:eesz=4M3M,xtal=80
-            platform: esp8266:esp8266
+            platform-url: https://arduino.esp8266.com/stable/package_esp8266com_index.json
 
           - arduino-boards-fqbn: esp32:esp32:featheresp32:FlashFreq=80
-            platform: esp32:esp32
+            platform-url: https://dl.espressif.com/dl/package_esp32_index.json
 
           - arduino-boards-fqbn: STM32:stm32:GenF1:pnum=BLUEPILL_F103C8
-            platform: STM32:stm32
-            
-######################################################
-# End of configuration, start of fixed script section
-######################################################
+            platform-url: https://github.com/stm32duino/BoardManagerFiles/raw/dev/STM32/package_stm_index.json
 
       # Do not cancel all jobs / architectures if one job fails
       fail-fast: false
@@ -91,68 +78,13 @@ jobs:
 
       # First of all, we clone the repo using the `checkout` action.
       - name: Checkout
-        uses: actions/checkout@master
-
-      # We use the `arduino/setup-arduino-cli` action to install and
-      # configure the Arduino CLI on the system.
-      - name: Setup Arduino CLI
-        uses: arduino/setup-arduino-cli@v1.0.0
-
-      - name: Link this repository as Arduino library
-        run: |
-          mkdir -p $HOME/Arduino/libraries
-          ln -s $PWD $HOME/Arduino/libraries/.
-
-      - name: Install platform from build matrix
-        env:
-          FQBN: ${{ matrix.arduino-boards-fqbn }}
-        run: |
-          arduino-cli core update-index
-          if [ "${{  matrix.platform }}" == "" ]; then echo -e ""$RED"ERROR: platform missing for board ${FQBN%|*}. Check your matrix.includes entries"; exit 1; fi
-          if [[ ${{  matrix.platform }} != *"arduino"* && ! -f ./arduino-cli.yaml ]]; then echo -e ""$RED"Non Arduino platform ${{  matrix.platform }} requested, but file arduino-cli.yaml is missing."; exit 1; fi
-          arduino-cli core install ${{ matrix.platform }} # for each job / board one platform is installed
-          arduino-cli board listall
-          if [ ${{  matrix.platform }} == "esp32:esp32" ]; then pip install pyserial; fi
-
-      - name: List installed boards with their FQBN
-        run: |
-          arduino-cli board listall
-          # ls -l $HOME/.arduino15/packages/ # I see only arduino and one of the Attiny cores but not all 3 together
-          # echo -e HOME=\"$HOME\" # /home/runner
-          # echo PWD=$PWD # /home/runner/work/Github-Actions-Test/Github-Actions-Test
-          # which arduino-cli # /opt/hostedtoolcache/arduino-cli/0.9.0/x64/arduino-cli
-
-      - name: Install libraries
-        run: if [[ "$REQUIRED_LIBRARIES" != "" ]]; then arduino-cli lib install ${{ env.REQUIRED_LIBRARIES }}; fi
+        uses: actions/checkout@v2
 
-      # Finally, we compile the sketch, using the FQBN that was set in the build matrix.
       - name: Compile all examples
-        env:
-          FQBN: ${{ matrix.arduino-boards-fqbn }}
-          BUILD_PROPERTIES: ${{ toJson(matrix.examples-build-properties) }}
-        run: |
-          BUILD_PROPERTIES=${BUILD_PROPERTIES#\{} # remove "{"
-          # if matrix.examples-build-properties are specified, create an associative shell array
-          if [[ $BUILD_PROPERTIES != "null" ]]; then declare -A PROP_MAP="( $(echo $BUILD_PROPERTIES | sed -E 's/"(\w*)": *([^,}]*)[,}]/\[\1\]=\2/g' ) )"; fi
-          echo -e "Compiling examples for board ${{ matrix.arduino-boards-fqbn }} \n"
-          EXAMPLES=($(find . -name "*.ino"))
-          for example in "${EXAMPLES[@]}"; do # Loop over all example directories
-            EXAMPLE_NAME=$(basename $(dirname $example))
-            if [[ "${{ matrix.examples-exclude }}" == *"$EXAMPLE_NAME"* ]]; then
-              echo -e "Skipping $EXAMPLE_NAME \xe2\x9e\x9e" # Right arrow
-            else
-              # check if there is an entry in the associative array and create a compile parameter
-              echo -n "Compiling $EXAMPLE_NAME "
-              if [[ "${PROP_MAP[$EXAMPLE_NAME]}" != "" ]]; then echo -n "with ${PROP_MAP[$EXAMPLE_NAME]} "; fi
-              build_stdout=$(arduino-cli compile --verbose --warnings all --fqbn ${FQBN%|*} --build-properties compiler.cpp.extra_flags="${PROP_MAP[$EXAMPLE_NAME]}" $(dirname $example) 2>&1);
-              if [ $? -ne 0 ]; then
-                echo -e ""$RED"\xe2\x9c\x96" # If ok output a green checkmark else a red X and the command output.
-                exit_code=1
-                echo -e "$build_stdout \n"
-              else
-                echo -e ""$GREEN"\xe2\x9c\x93"
-              fi
-            fi
-          done
-          exit $exit_code
-        shell: bash {0} # Needed to avoid an exit at first error
+        uses: ArminJo/arduino-test-compile@v2
+        with:
+          required-libraries: ${{ env.REQUIRED_LIBRARIES }}
+          arduino-board-fqbn: ${{ matrix.arduino-boards-fqbn }}
+          platform-default-url: ${{ env.PLATFORM_DEFAULT_URL }}
+          platform-url: ${{ matrix.platform-url }}
+          examples-exclude: ${{ matrix.examples-exclude }}
diff --git a/arduino-cli.yaml b/arduino-cli.yaml
deleted file mode 100644
index 98981f2..0000000
--- a/arduino-cli.yaml
+++ /dev/null
@@ -1,7 +0,0 @@
-board_manager:
-  additional_urls:
-    - http://digistump.com/package_digistump_index.json
-    - http://drazzy.com/package_drazzy.com_index.json
-    - http://arduino.esp8266.com/stable/package_esp8266com_index.json
-    - https://dl.espressif.com/dl/package_esp32_index.json
-    - https://github.com/stm32duino/BoardManagerFiles/raw/dev/STM32/package_stm_index.json