Add CO2 level check to LED control logic

Author: davidkreidler

.github/workflows/arduino_build.yml

@@ -27,6 +27,9 @@ jobs:
               source-path: ./esp32-waveshare-epd
           sketch-paths: |
             - .
+          cli-compile-flags: |
+            --build-property
+            build.f_cpu=80000000L
 
       - name: Stage firmware into ./build/... and rename to FIRMWARE.BIN
         shell: bash

OpenCO2_Sensor.ino

@@ -421,6 +421,7 @@ void getColor(uint16_t co2, int* red, int* green, int* blue) {
 void setLED(uint16_t co2) {
   updateBatteryMode();
   if ((BatteryMode && !LEDonBattery)
+      || (co2 < 1000)
       || (!BatteryMode && !LEDonUSB)) {
     if (HWSubRev == 3) digitalWrite(LED_POWER, LOW);  // LED OFF
     else               digitalWrite(LED_POWER, HIGH); // LED OFF