#define NOTE_C4  261
#define NOTE_D4  294
#define NOTE_E4  329
#define NOTE_F4  349
#define NOTE_G4  392
#define NOTE_A4  440
#define NOTE_B4  493
#define NOTE_C5  523

const int buzzerPin = 12; // Pin buzzer

void setup() {
  pinMode(buzzerPin, OUTPUT);
}

void loop() {
  // Memainkan melodi sederhana
  playMelody();
}

void playTone(int frequency, int duration) {
  for (long i = 0; i < duration * 1000L; i += frequency * 2) {
    digitalWrite(buzzerPin, HIGH);
    delayMicroseconds(frequency);
    digitalWrite(buzzerPin, LOW);
    delayMicroseconds(frequency);
  }
}

void playMelody() {
  int melody[] = {
    NOTE_C4, NOTE_E4, NOTE_G4, NOTE_C5,
    NOTE_G4, NOTE_E4, NOTE_C4,
    NOTE_G4, NOTE_E4, NOTE_C4,
    NOTE_C4, NOTE_C4, NOTE_C4,
    NOTE_G4, NOTE_A4, NOTE_G4, NOTE_F4, NOTE_E4,
    NOTE_G4, NOTE_A4, NOTE_G4, NOTE_F4, NOTE_E4,
    NOTE_C4, NOTE_E4, NOTE_G4, NOTE_C5,
    NOTE_G4, NOTE_E4, NOTE_C4
  };

  int noteDurations[] = {
    4, 4, 4, 4,
    4, 4, 2,
    4, 4, 2,
    4, 4, 4,
    8, 8, 4, 4, 4,
    8, 8, 4, 4, 4,
    4, 4, 4, 4,
    4, 4, 2
  };

  for (int i = 0; i < sizeof(melody) / sizeof(melody[0]); i++) {
    if (melody[i] == 0) {
      delay(noteDurations[i]);
    } else {
      playTone(melody[i], noteDurations[i] * 125);
      delay(noteDurations[i] * 1.30);
    }
  }
}