const int potPin = A0;
const int greenLED = 9;
const int yellowLED = 10;
const int redLED = 11;

void setup() {
  pinMode(redLED, OUTPUT);
  pinMode(greenLED, OUTPUT);
  pinMode(yellowLED, OUTPUT);
}

void loop() {
  int potValue = analogRead(potPin); // 0–1023

  // LEDs nach Bereich einschalten
  if (potValue < 341) {
    // ROT leuchtet
    digitalWrite(greenLED, LOW);
    digitalWrite(yellowLED, LOW);
    digitalWrite(redLED, HIGH);
  }
  else if (potValue < 682) {
    // GELB leuchtet
    digitalWrite(greenLED, LOW);
    digitalWrite(yellowLED, HIGH);
    digitalWrite(redLED, LOW);
  }
  else {
    // GRÜN leuchtet
    digitalWrite(greenLED, HIGH);
    digitalWrite(yellowLED, LOW);
    digitalWrite(redLED, LOW);
  }

  delay(50);  // kleine Pause für Stabilität
}