title: Arduino - How to control piezo with button?
body: <p>What I am trying to achieve is a button that acts as an on/off switch for playing a tune on a piezo. Initially I want the piezo not to make any sound until the user presses a button, and then they can turn the piezo off by pressing the same button. I'm wondering if anyone can help me figure out what code I need to add to this to get this kind of button functionality.</p>
  
  <p>This is a modified version of the toneMelody sketch that comes with Arduino IDE, I have a button attached to Pin 12, and a Piezo to Pin 8.</p>
  
  <pre><code> #include "pitches.h"
  
  // notes in the melody:
  int melody[] ={
  NE5,NF5,NG5,ND6,0,NC6,NC6,NB5,NG5,NF5,0,NF5,NF5,NE5,NC5,NF5,NE5,ND5,NC5,NE5,ND5,0,NE5,NF5,NG5,ND6,0,NC6,NC6,NB5,NG5,NF5,0,NF5,NF5,NE5,NC5,NF5,NE5,ND5,NC5,NE5,ND5,0,
  0,NC5,NE5,NG5,NG5,NE5,ND5,NE5,ND5,0,NC5,NE5,NG5,NG5,NE5,ND5,0,NE5,0,NC5,NE5,NG5,NG5,NE5,ND5,NE5,ND5,0,NC5,NE5,NG5,NG5,NA5,NE5,0,NE5,
  0,NC5,NE5,NG5,NG5,NE5,ND5,NE5,ND5,0,NC5,NE5,NG5,NG5,NE5,ND5,0,NE5,0,NC5,NE5,NG5,NG5,NE5,ND5,NE5,ND5,NF5,0,NE5,0,NC5,NF5,0,NE5,0,NC5,
  NE5,NE5,NE5,0,NE5,0,ND5,NE5,NE5,NE5,0,NE5,0,ND5,NE5,NE5,NE5,0,NE5,0,ND5,ND5,NB4,NB4,0,NC5,0,NG5,
  NE5,NE5,NE5,0,NE5,0,ND5,NE5,NE5,NE5,0,NE5,0,ND5,NE5,NE5,NE5,0,NE5,0,ND5,ND5,
  NE5,NF5,NG5,ND6,0,NC6,NC6,NB5,NG5,NF5,0,NF5,NF5,NE5,NC5,NF5,NE5,ND5,NC5,NE5,ND5,0,NE5,NF5,NG5,ND6,0,NC6,NC6,NB5,NG5,NF5,0,NF5,NF5,NE5,NC5,NF5,NE5,ND5,NC5,NE5,ND5,0,
  NE5,NF5,NE5,ND5,ND5,NC5,NC5,NC5,ND5,ND5,NE5,0,NE5,NF5,NE5,ND5,ND5,NC5,NC5,NC5,NG5,ND5,0,
  NE5,NF5,NE5,ND5,ND5,NC5
                };
  // note durations: 4 = quarter note, 8 = eighth note, etc.:
  int noteDurations[] = {
                 8,8,8,4,8,4,8,8,8,4,8,4,8,8,8,4,4,8,8,8,2,8,8,8,8,4,8,4,8,8,8,4,8,4,8,8,8,4,4,8,8,8,2,8,
                 8,8,8,8,8,16,8,16,8,8,8,8,8,8,16,8,16,8,8,8,8,8,8,16,8,16,8,8,8,8,8,8,16,8,16,8,
                 8,8,8,8,8,16,8,16,8,8,8,8,8,8,16,8,16,8,8,8,8,8,8,16,8,16,8,8,16,8,16,8,8,16,8,16,8,
                 4,4,8,16,8,16,8,4,4,8,16,8,16,8,4,4,8,16,8,16,8,4,4,8,16,8,16,8,
                 4,4,8,16,8,16,8,4,4,8,16,8,16,8,4,4,8,16,8,16,8,2,
                 8,8,8,4,8,4,8,8,8,4,8,4,8,8,8,4,4,8,8,8,2,8,8,8,8,4,8,4,8,8,8,4,8,4,8,8,8,4,4,8,8,8,2,8,
                 8,8,8,8,4,4,8,8,8,4,2,8,8,8,8,8,4,4,8,8,8,2,8, 
                 8,8,8,8,4,1
                 };
  
  void setup() {
    // iterate over the notes of the melody:
    for (int thisNote = 0; thisNote &lt; 240; 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;
      delay(pauseBetweenNotes);
      // stop the tone playing:
      noTone(8);
    }
  }
  
  void loop() {
    // no need to repeat the melody.
  }
  </code></pre>