co2_sensor: Disable state logging by default

ampel-firmware/co2_sensor.cpp

@@ -15,6 +15,7 @@ namespace config {
   const float temperature_offset = -3.0;  // [K] Temperature measured by sensor is usually at least 3K too high.
 #endif
   bool auto_calibrate_sensor = AUTO_CALIBRATE_SENSOR; // [true / false]
+  const bool debug_sensor_states = false; // If true, log state transitions over serial console
 }
 
 namespace sensor {
@@ -172,10 +173,12 @@ namespace sensor {
 
   void switchState(state new_state) {
     if (new_state == current_state) return;
-    Serial.print(F("Changing sensor state: "));
-    Serial.print(state_names[current_state]);
-    Serial.print(" -> ");
-    Serial.println(state_names[new_state]);
+    if (config::debug_sensor_states) {
+      Serial.print(F("Changing sensor state: "));
+      Serial.print(state_names[current_state]);
+      Serial.print(" -> ");
+      Serial.println(state_names[new_state]);
+    }
     current_state = new_state;
   }