// Note frequencies
#define NOTE_C4  262
#define NOTE_D4  294
#define NOTE_E4  330
#define NOTE_F4  349
#define NOTE_G4  392
#define NOTE_A4  440
#define NOTE_AS4 466
#define NOTE_C5  523

int buzzer = 8; // Buzzer connected to pin 8

// Melody (Happy Birthday)
int melody[] = {
  NOTE_C4, NOTE_C4, NOTE_D4, NOTE_C4, NOTE_F4, NOTE_E4,
  NOTE_C4, NOTE_C4, NOTE_D4, NOTE_C4, NOTE_G4, NOTE_F4,
  NOTE_C4, NOTE_C4, NOTE_C5, NOTE_A4, NOTE_F4, NOTE_E4, NOTE_D4,
  NOTE_AS4, NOTE_AS4, NOTE_A4, NOTE_F4, NOTE_G4, NOTE_F4
};

// Durations (4 = quarter note, 2 = half note, 1 = whole note)
int noteDurations[] = {
  4,4,2,2,2,1,
  4,4,2,2,2,1,
  4,4,2,2,2,2,1,
  4,4,2,2,2,1
};

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

void loop() {
  // Play all notes in the melody
  for (int thisNote = 0; thisNote < 26; thisNote++) {
    int noteDuration = 1000 / noteDurations[thisNote]; 
    tone(buzzer, melody[thisNote], noteDuration);

    // Small pause between notes
    int pauseBetweenNotes = noteDuration * 1.3;
    delay(pauseBetweenNotes);

    noTone(buzzer); // Stop playing
  }

  delay(1000); // Pause before repeating
}
// happy birthday tone generate using buzzer