/*
  Melody
 
 Plays a melody 
 
 circuit:
 * 8-ohm speaker on digital pin 8
 
 created 21 Jan 2010
 by Tom Igoe 

This example code is in the public domain.
 
 http://arduino.cc/en/Tutorial/Tone
 
 */
 #include "pitches.h"

// notes in the melody:
 int melody[] = {
   NOTE_C4, NOTE_G3, NOTE_G3, NOTE_A3, NOTE_G3,0, NOTE_B3, NOTE_C4};

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

void playTone(int tone, int duration) {
  int halfPeriod = 1000000L/(2*tone);
  for (long i = 0; i < duration * 1000L; i += halfPeriod * 2) {
    digitalWrite(8, HIGH);
    delayMicroseconds(halfPeriod);
    digitalWrite(8, LOW);
    delayMicroseconds(halfPeriod);
  }
}

void setup() {
  pinMode(8, OUTPUT) ;
  // iterate over the notes of the melody:
  for (int thisNote = 0; thisNote < 8; thisNote++) {

    // to calculate the note duration, take one second 
    // divided by the note type.
    //e.g. quarter note = 1000 / 4, eighth note = 1000/8, etc.
    int noteDuration = 1000/noteDurations[thisNote];
    if (melody[thisNote]) 
      playTone(melody[thisNote],noteDuration);
    else 
     delay(noteDuration) ;     
    
    // to distinguish the notes, set a minimum time between them.
    // the note's duration + 30% seems to work well:
    // int pauseBetweenNotes = noteDuration * 1.30;
    int pauseBetweenNotes = noteDuration * 0.30 ;
    delay(pauseBetweenNotes);
  }
}


void loop() {
  // no need to repeat the melody.
}