add optional activity LED

coro2sens/coro2sens.ino

@@ -63,6 +63,9 @@
 // Label describing the time axis.
 #define TIME_LABEL "1 hour"
 
+// Activity indicator LED (use the built-in LED if your board has one).
+//#define ACTIVITY_LED_PIN 5
+
 // =============================================================================
 
 
@@ -149,7 +152,10 @@ void setup() {
 
  // Initialize pins.
  pinMode(BUZZER_PIN, OUTPUT);
- pinMode(SWITCH_PIN, OUTPUT);
+#if defined(ACTIVITY_LED_PIN)
+ pinMode(ACTIVITY_LED_PIN, OUTPUT);
+ digitalWrite(ACTIVITY_LED_PIN, HIGH);
+#endif
 
  // Initialize LED(s).
  FastLED.addLeds<LED_CHIPSET, LED_PIN, LED_COLOR_ORDER>(leds, NUM_LEDS);
@@ -231,6 +237,10 @@ void loop() {
  return;
  }
 
+#if defined(ACTIVITY_LED_PIN)
+ digitalWrite(ACTIVITY_LED_PIN, LOW);
+#endif
+
  // Read sensors.
  if (bme280isConnected) {
  pressure = (uint16_t) (bme280.readFloatPressure() / 100);
@@ -286,6 +296,10 @@ void loop() {
  alarmHasTriggered = false;
  }
 
+#if defined(ACTIVITY_LED_PIN)
+ digitalWrite(ACTIVITY_LED_PIN, HIGH);
+#endif
+
  lastMeasureTime = millis();
 }