source: rtos_arduino/trunk/arduino_lib/libraries/Esplora/examples/Beginners/EsploraMusic/EsploraMusic.ino@ 136

/*
  Esplora Music

  This sketch turns the Esplora in a simple musical instrument.
  Press the Switch 1 and move the slider to see how it works.

  Created on 22 november 2012
  By Enrico Gueli <enrico.gueli@gmail.com>
  modified 22 Dec 2012
  by Tom Igoe
*/


#include <Esplora.h>

// these are the frequencies for the notes from middle C
// to one octave above middle C:
const int note[] = {
  262, // C
  277, // C#
  294, // D
  311, // D#
  330, // E
  349, // F
  370, // F#
  392, // G
  415, // G#
  440, // A
  466, // A#
  494, // B
  523  // C next octave
};

void setup() {
}

void loop() {
  // read the button labeled SWITCH_DOWN. If it's low,
  // then play a note:
  if (Esplora.readButton(SWITCH_DOWN) == LOW) {
    int slider = Esplora.readSlider();

    // use map() to map the slider's range to the
    // range of notes you have:
    byte thisNote = map(slider, 0, 1023, 0, 13);
    // play the note corresponding to the slider's position:
    Esplora.tone(note[thisNote]);
  }
  else {
    // if the button isn't pressed, turn the note off:
    Esplora.noTone();
  }
}