void setup() {
pinMode(11, OUTPUT);
pinMode(10, OUTPUT);
pinMode(9, OUTPUT);
}

void loop() {
  int sensorValue = analogRead(A0);
float voltage = sensorValue * (5.0 / 1023.0);
bool kalt = voltage < 1.0;
bool normal = voltage >= 1.0 && voltage < 2.0;
bool warm = voltage >= 2.0;
if (kalt) {
  digitalWrite(9, LOW);   // Rot aus
  digitalWrite(10, HIGH); // Grün an
  digitalWrite(11, LOW);  // Blau aus
}

if (normal) {
  digitalWrite(9, HIGH);  // Rot an
  digitalWrite(10, HIGH); // Grün an
  digitalWrite(11, LOW);  // Blau aus
}

if (warm) {
  digitalWrite(9, HIGH);  // Rot an
  digitalWrite(10, LOW);  // Grün aus
  digitalWrite(11, LOW);  // Blau aus
}

}