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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<p><strong>Reference</strong> &nbsp; <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>Wire Library</h2>
<p>This library allows you to communicate with <span class='wikiword'>I2C</span> / TWI devices. On most Arduino boards, SDA (data line) is on analog input pin 4, and SCL (clock line) is on analog input pin 5. On the Arduino Mega, SDA is digital pin 20 and SCL is 21.
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<p class='vspace'></p><h4>Functions</h4>
<ul><li><a class='wikilink' href='WireBegin.html'>begin</a>()
</li><li><a class='wikilink' href='WireBegin.html'>begin</a>(address)
</li><li><a class='wikilink' href='WireRequestFrom.html'>requestFrom</a>(address, count)
</li><li><a class='wikilink' href='WireBeginTransmission.html'>beginTransmission</a>(address)
</li><li><a class='wikilink' href='WireEndTransmission.html'>endTransmission</a>()
</li><li><a class='wikilink' href='WireSend.html'>send</a>()
</li><li>byte <a class='wikilink' href='WireAvailable.html'>available</a>()
</li><li>byte <a class='wikilink' href='WireReceive.html'>receive</a>()
</li><li><a class='wikilink' href='WireOnReceive.html'>onReceive</a>(handler)
</li><li><a class='wikilink' href='WireOnRequest.html'>onRequest</a>(handler)
</li></ul><p class='vspace'></p><h4>Note</h4>
<p>There are both 7- and 8-bit versions of <span class='wikiword'>I2C</span> addresses. 7 bits identify the device, and the eighth bit determines if it's being written to or read from. The Wire library uses 7 bit addresses throughout. If you have a datasheet or sample code that uses 8 bit address, you'll want to drop the low bit (i.e. shift the value one bit to the right), yielding an address between 0 and 127.
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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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