Add CO2 level check to LED control logic

Author: davidkreidler

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

epd_abstraction.ino

@@ -441,6 +441,8 @@ void displayWriteMeasuerments(uint16_t co2, float temperature, float humidity) {
     /* humidity */
     Paint_DrawNum(124, 5, humidity, &mid, BLACK, WHITE);
     Paint_DrawString_EN(184, 5, "%", &bahn_sml, WHITE, BLACK);
+
+    Paint_DrawNum(50, 180, (int32_t)ESP.getCpuFreqMHz(), &Font16, BLACK, WHITE);
 #endif /* EINK_1IN54V2 */
 
 #ifdef EINK_4IN2