int buttonPin = 2; 
int relayPin = 3;  
int buttonState = 0;  
int lastButtonState = 0;

void setup() {
  pinMode(buttonPin, INPUT);
  pinMode(relayPin, OUTPUT);
  digitalWrite(relayPin, LOW); // Turn relay off by default
}

void loop() {
  buttonState = digitalRead(buttonPin);
  if (buttonState != lastButtonState) {
    if (buttonState == HIGH) {
      digitalWrite(relayPin, !digitalRead(relayPin));  // Toggle relay state
    }
    delay(50);  // Short delay for debounce
  }
  lastButtonState = buttonState;
}