90 lines
4.4 KiB
HTML
90 lines
4.4 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<title>Arduino - Tone </title>
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<div class="title"><a href="http://www.arduino.cc"/>Arduino</a></div>
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<p><strong>Reference</strong> <a class='wikilink' href='index.html'>Language</a> (<a class='wikilink' href='Extended.html'>extended</a>) | <a class='wikilink' href='Libraries.html'>Libraries</a> | <a class='wikilink' href='Comparison.html'>Comparison</a> | <a class='wikilink' href='Changes.html'>Changes</a>
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</p>
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<p class='vspace'></p><h2>tone()</h2>
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<h4>Description</h4>
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<p>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 <a class='wikilink' href='NoTone.html'>noTone</a>(). The pin can be connected to a piezo buzzer or other speaker to play tones.
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</p>
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<p class='vspace'></p><p>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.
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</p>
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<p class='vspace'></p><h4>Syntax</h4>
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<p>tone(pin, frequency) <br />tone(pin, frequency, duration)
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</p>
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<p class='vspace'></p><h4>Parameters</h4>
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<p>pin: the pin on which to generate the tone
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</p>
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<p class='vspace'></p><p>frequency: the frequency of the tone in hertz
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</p>
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<p class='vspace'></p><p>duration: the duration of the tone in milliseconds (optional)
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</p>
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<p class='vspace'></p><h4>Returns</h4>
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<p>nothing
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</p>
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<p class='vspace'></p><h4>See also</h4>
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<ul><li><a class='wikilink' href='NoTone.html'>noTone</a>()
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</li><li><a class='wikilink' href='AnalogWrite.html'>analogWrite</a>()
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</li><li><a class='wikilink' href='http://arduino.cc/en/Tutorial/PWM'>Tutorial: PWM</a>
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</li></ul><p class='vspace'></p><p><a class='wikilink' href='index.html'>Reference Home</a>
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<p class='vspace'></p><p><em>Corrections, suggestions, and new documentation should be posted to the <a class='urllink' href='http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?board=swbugs' rel='nofollow'>Forum</a>.</em>
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</p>
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<p class='vspace'></p><p>The text of the Arduino reference is licensed under a
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<a class='urllink' href='http://creativecommons.org/licenses/by-sa/3.0/' rel='nofollow'>Creative Commons Attribution-ShareAlike 3.0 License</a>. Code samples in the reference are released into the public domain.
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