Common Project - Xmas 2013 Music

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Revision as of 21:57, 25 November 2013 by Paulmaidment (talk | contribs) (Christmas tunes on an Arduino)
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Christmas tunes on an Arduino

The circuit is simple, an 8 ohm speaker is connected to Arduino pin 8, with the cathode connected to the ground.

/* Modified Tone Sketch from Tom Igoe - Taken from the Arduino SDK examples */
/* Modded by NJA Hackers to play Jingle Bells*/
#include "pitches.h"

// notes in the melody:
int melody[] = {
  NOTE_E5,NOTE_E5,NOTE_E5,NOTE_E5,NOTE_E5,NOTE_E5,NOTE_E5,NOTE_G5,NOTE_C5,NOTE_D5,NOTE_E5,
  NOTE_F5,NOTE_F5,NOTE_F5,NOTE_F5,NOTE_F5,NOTE_E5,NOTE_E5,NOTE_E5,NOTE_E5,NOTE_D5,NOTE_D5,
  NOTE_E5,NOTE_D5,NOTE_G5,
  NOTE_E5,NOTE_E5,NOTE_E5,NOTE_E5,NOTE_E5,NOTE_E5,NOTE_E5,NOTE_G5,NOTE_C5,NOTE_D5,NOTE_E5,
  NOTE_F5,NOTE_F5,NOTE_F5,NOTE_F5,NOTE_F5,NOTE_E5,NOTE_E5,NOTE_E5,NOTE_G5,NOTE_G5,NOTE_F5,
  NOTE_D5,NOTE_C5,
};

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

void setup() {  
  int numberOfNotes = sizeof(melody)/sizeof(int);
  // iterate over the notes of the melody:
  for (int thisNote = 0; thisNote < numberOfNotes; 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 = 200*noteDurations[thisNote];
    tone(8, melody[thisNote],noteDuration); 

    // to distinguish the notes, set a minimum time between them.
    // the note's duration + 30% seems to work well:
    int pauseBetweenNotes = noteDuration * 0.8;
    delay(pauseBetweenNotes);
    // stop the tone playing:
    noTone(8);
  }
}

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