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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(). 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.

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

Reference Home

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The text of the Arduino reference is licensed under a Creative Commons Attribution-ShareAlike 3.0 License. Code samples in the reference are released into the public domain.