#include "pitches.h"

int speakerPin = 8;

int happy_birthday[] = {
  NOTE_G4, NOTE_G4, NOTE_A4, NOTE_G4, NOTE_C5, NOTE_B4, ' ',
  NOTE_G4, NOTE_G4, NOTE_A4, NOTE_G4, NOTE_D5, NOTE_C5, ' ',
  NOTE_G4, NOTE_G4, NOTE_G5, NOTE_E5, NOTE_C5, NOTE_B4, NOTE_A4, ' ',
  NOTE_F5, NOTE_F5, NOTE_E5, NOTE_C5, NOTE_D5, NOTE_C5
};

// note durations: 4 = quarter note, 8 = eighth note, etc.:
int noteDurations[] = {
  1,1,2,2,2,2,2,1,1,2,2,2,2,2,1,1,2,2,2,2,2,1,1,2,2,2,2,2,2
};

int length = sizeof(happy_birthday);
int tempo = 1500;

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

void playNote(int OutputPin, int songs[], int noteDurations[]){
  for (int i = 0; i < length; i++){
    if (songs[i] == ' '){
      delay(noteDurations[i] * tempo * 0.5);
    }else{
      tone(OutputPin, songs[i], noteDurations[i] * tempo);
      delay(tempo/5);
      noTone(OutputPin);
    }   
  }
}

void loop() {
  playNote(speakerPin, happy_birthday, noteDurations);
}