int buttonPin = 2;
int ledPin = 7;
int buzzerPin = 8;

int melody[] = {262,330,392,523}; //do, mi, sol, do
int noteDuration = 600;

void setup() {
  pinMode(buttonPin, INPUT_PULLUP); // tombol dengan internal pull-up
  pinMode(ledPin, OUTPUT);
  pinMode(buzzerPin, OUTPUT);
}

void loop() {
  int buttonState = digitalRead(buttonPin);
  
  if (buttonState == LOW) { 
    digitalWrite(ledPin, HIGH);
    
    for (int i = 0; i < 4; i++) {
      tone(buzzerPin, melody[i]); 
      delay(noteDuration);
      noTone(buzzerPin);
      delay(50);
    }
      
      delay(300);
  } else {
    digitalWrite(ledPin, LOW);
    noTone(buzzerPin);
  }
}