Allow to switch LED breathing off

ampel-firmware/co2_sensor.cpp

@@ -13,6 +13,7 @@ namespace config {
   const float temperature_offset = -3.0;  // [K] Temperature measured by sensor is usually at least 3K too high.
 #endif
   const bool auto_calibrate_sensor = AUTO_CALIBRATE_SENSOR; // [true / false]
+  const bool led_breathing = LED_BREATHING;
 }
 
 namespace sensor {
@@ -137,7 +138,9 @@ namespace sensor {
      */
     if (co2 < 2000) {
       led_effects::displayCO2color(co2);
-      led_effects::breathe(co2);
+      if (config::led_breathing) {
+        led_effects::breathe(co2);
+      }
     } else {
       // >= 2000: entire ring blinks red
       led_effects::redAlert();

ampel-firmware/config.public.h

@@ -64,6 +64,9 @@
 #  define MAX_BRIGHTNESS 255
 #  define MIN_BRIGHTNESS 60
 
+// Should the LED display show a breathing effect during measurement?
+#  define LED_BREATHING true // [true / false]
+
 /**
  * WEB SERVER
  * available at http://local_ip, with user HTTP_USER and password HTTP_PASSWORD