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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 class='vspace'></p><h2>Servo library</h2>

<p>This library allows an Arduino board to control RC (hobby) servo motors. Servos have integrated gears and a shaft that can precisely controlled. Standard servos allow the shaft to be positioned at various angles, usually between 0 and 180 degrees. Continuous rotation servos allow the rotation of the shaft to be set to various speeds.

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<p class='vspace'></p><p>As of Arduino 0017, the Servo library supports up to 12 motors on most Arduino boards and 48 on the Arduino Mega. On boards other than the Mega, use of the library disables analogWrite() (PWM) functionality on pins 9 and 10, whether or not there is a Servo on those pins. On the Mega, up to 12 servos can be used without interfering with PWM functionality; use of 12 to 23 motors will disable PWM on pins 11 and 12.

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<p class='vspace'></p><p>In Arduino 0016 and earlier, the Servo library uses functionality built in to the hardware, and works only on pins 9 and 10 (and does not work on the Arduino Mega). In this case, if only one servo is used, the other pin cannot be used for normal PWM output with analogWrite(). For example, in Arduino 0016 and earlier, you can't have a servo on pin 9 and PWM output on pin 10.

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<p class='vspace'></p><h4>Circuit</h4>

<p>Servo motors have three wires: power, ground, and signal. The power wire is typically red, and should be connected to the 5V pin on the Arduino board. The ground wire is typically black or brown and should be connected to a ground pin on the Arduino board. The signal pin is typically yellow, orange or white and should be connected to a digital pin on the Arduino board. Note servos draw considerable power, so if you need to drive more than one or two, you'll probably need to power them from a separate supply (i.e. not the +5V pin on your Arduino). Be sure to connect the grounds of the Arduino and external power supply together.

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<p class='vspace'></p><h4>Functions</h4>

<ul><li><a class='wikilink' href='ServoAttach.html'>attach()</a>

</li><li><a class='wikilink' href='ServoWrite.html'>write()</a>

</li><li><a class='wikilink' href='ServoWriteMicroseconds.html'>writeMicroseconds()</a>

</li><li><a class='wikilink' href='ServoRead.html'>read()</a>

</li><li><a class='wikilink' href='ServoAttached.html'>attached()</a>

</li><li><a class='wikilink' href='ServoDetach.html'>detach()</a>

</li></ul><p class='vspace'></p><h4>Examples</h4>

<ul><li><a class='wikilink' href='http://arduino.cc/en/Tutorial/Sweep'>Sweep</a>

</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 class='vspace'></p><p>The text of the Arduino reference is licensed under a

<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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