const int buttonPin1 = 9;
const int buttonPin2 = 8;
const int buttonPin3 = 7;
const int buttonPin4 = 6;
const int ledPin1 = 2;
const int ledPin2 = 3;
const int ledPin3 = 4;
const int ledPin4 = 5;
const int RelaisPin1 = A2;
const int RelaisPin2 = A3;
const int RelaisPin3 = A4;
const int RelaisPin4 = A5;


int lastButtonPressed = -1;

void setup() {
  pinMode(buttonPin1, INPUT);
  pinMode(buttonPin2, INPUT);
  pinMode(buttonPin3, INPUT);
  pinMode(buttonPin4, INPUT);
  pinMode(ledPin1, OUTPUT);
  pinMode(ledPin2, OUTPUT);
  pinMode(ledPin3, OUTPUT);
  pinMode(ledPin4, OUTPUT);
  pinMode(RelaisPin1, OUTPUT);
  pinMode(RelaisPin2, OUTPUT);
  pinMode(RelaisPin3, OUTPUT);
  pinMode(RelaisPin4, OUTPUT);
  digitalWrite(ledPin1, LOW);
  digitalWrite(ledPin2, LOW);
  digitalWrite(ledPin3, LOW);
  digitalWrite(ledPin4, LOW);
  digitalWrite(RelaisPin1, LOW);
  digitalWrite(RelaisPin2, LOW);
  digitalWrite(RelaisPin3, LOW);
  digitalWrite(RelaisPin4, LOW);
}

void loop() {
  if (digitalRead(buttonPin1) == HIGH) {
    if (lastButtonPressed != 1) {
      turnOffAll();
      digitalWrite(ledPin1, HIGH);
      digitalWrite(RelaisPin1, HIGH);
      lastButtonPressed = 1;
    } else {
      digitalWrite(ledPin1, LOW);
      digitalWrite(RelaisPin1, LOW);
      lastButtonPressed = -1;
    }
    while(digitalRead(buttonPin1) == HIGH); // Debounce
  }

  if (digitalRead(buttonPin2) == HIGH) {
    if (lastButtonPressed != 2) {
      turnOffAll();
      digitalWrite(ledPin2, HIGH);
      digitalWrite(RelaisPin2, HIGH);
      lastButtonPressed = 2;
    } else {
      digitalWrite(ledPin2, LOW);
      digitalWrite(RelaisPin2, LOW);
      lastButtonPressed = -1;
    }
    while(digitalRead(buttonPin2) == HIGH); // Debounce
  }

  if (digitalRead(buttonPin3) == HIGH) {
    if (lastButtonPressed != 3) {
      turnOffAll();
      digitalWrite(ledPin3, HIGH);
      digitalWrite(RelaisPin3, HIGH);
      lastButtonPressed = 3;
    } else {
      digitalWrite(ledPin3, LOW);
      digitalWrite(RelaisPin3, LOW);
      lastButtonPressed = -1;
    }
    while(digitalRead(buttonPin3) == HIGH); // Debounce
  }

  if (digitalRead(buttonPin4) == HIGH) {
    if (lastButtonPressed != 4) {
      turnOffAll();
      digitalWrite(ledPin4, HIGH);
      digitalWrite(RelaisPin4, HIGH);
      lastButtonPressed = 4;
    } else {
      digitalWrite(ledPin4, LOW);
      digitalWrite(RelaisPin4, LOW);
      lastButtonPressed = -1;
    }
    while(digitalRead(buttonPin4) == HIGH); // Debounce
  }

  delay(50); // Verzögerung für Stabilität
}

void turnOffAll() {
  digitalWrite(ledPin1, LOW);
  digitalWrite(ledPin2, LOW);
  digitalWrite(ledPin3, LOW);
  digitalWrite(ledPin4, LOW);
  digitalWrite(RelaisPin1, LOW);
  digitalWrite(RelaisPin2, LOW);
  digitalWrite(RelaisPin3, LOW);
  digitalWrite(RelaisPin4, LOW);
}