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+.. _arduino-tone:
+
+tone()
+======
+
+Description
+-----------
+
+Generates a square wave of the specified frequency (and 50% duty
+cycle) on a pin. A duration can be specified, otherwise the wave
+continues until a call to
+`noTone <http://arduino.cc/en/Reference/NoTone>`_\ (). The pin can be
+connected to a piezo buzzer or other speaker to play tones.
+
+
+
+Only one tone can be generated at a time. If a tone is already
+playing on a different pin, the call to tone() will have no effect.
+If the tone is playing on the same pin, the call will set its
+frequency.
+
+
+
+Use of the tone() function will interfere with PWM output on pins 3
+and 11 (on boards other than the Mega).
+
+
+
+**NOTE:** if you want to play different pitches on multiple pins,
+you need to call noTone() on one pin before calling tone() on the
+next pin.
+
+
+
+Syntax
+------
+
+tone(pin, frequency)
+tone(pin, frequency, duration)
+
+
+
+Parameters
+----------
+
+pin: the pin on which to generate the tone
+
+
+
+frequency: the frequency of the tone in hertz
+
+
+
+duration: the duration of the tone in milliseconds (optional)
+
+
+
+Returns
+-------
+
+nothing
+
+
+
+See also
+--------
+
+
+-  `noTone <http://arduino.cc/en/Reference/NoTone>`_\ ()
+-  `analogWrite <http://arduino.cc/en/Reference/AnalogWrite>`_\ ()
+-  `Tutorial:Tone <http://arduino.cc/en/Tutorial/Tone>`_
+-  `Tutorial:Pitch follower <http://arduino.cc/en/Tutorial/Tone2>`_
+-  `Tutorial:Simple Keyboard <http://arduino.cc/en/Tutorial/Tone3>`_
+-  `Tutorial: multiple tones <http://arduino.cc/en/Tutorial/Tone4>`_
+   
+
+-  `Tutorial: PWM <http://arduino.cc/en/Tutorial/PWM>`_
+