Tuesday, March 6, 2012

toneMelody Sketch in Simple Language


 Plays a melody

 * 8-ohm speaker on digital pin 8

 created 21 Jan 2010
 modified 30 Aug 2011
 by Tom Igoe

This example code is in the public domain.


 #include "pitches.h"

// notes in the melody:
int melody[] = {

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

void setup() {
  // 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];
    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 * 1.30;
    // stop the tone playing:

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


This sketch programs the Arduino to play a sound or melody in accordance to the notes written. The circuit uses an 8-ohm speaker that is set to be plugged into pin 8 on the Arduino. The code already shows that it references "Pitches", the various sounds that Arduino can call upon. The numbers 4 and 8 refer the types of musical notes; a quarter note and an eighth note. The sequence of numbers equivalates to a sequence of musical notes. In the parenthesis, that is a for statement, which tells the Arduino a rule. The duration tells the Arduino how long to play the sequence for. The pause statement tells it how long, if any, the pause inbetween each number/note lasts. The last line in the main bracket tells it to stop the sequence. Void loop means that the sequence only plays once and does not repeat.

No comments:

Post a Comment