     previousMillis += INTERVAL;
     updateActualLevel();
     rainbow();
-    Serial.println(mLevel);
   }
 }
 

void loop(){
  while(Serial.available() > 0) {
    int level = charToInt(Serial.read());
    setLevel(level);
  }


unsigned long currentMillis;

int charToInt(char c){
  int i = (int) c;
  if(i < 48 || 58 < i){
    return -1;
  }
  return (i - 48) * 6;
}

void decLevel(){
