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<title>Arduino Reference - DelayMicroseconds </title>
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<div class="title"><a href='http://arduino.cc/en'>Arduino</a></div>
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<p><strong>Reference</strong> <a class='wikilink' href='index.html'>Language</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>delayMicroseconds()</h2>
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<h4>Description</h4>
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<p>Pauses the program for the amount of time (in microseconds) specified as parameter. There are a thousand microseconds in a millisecond, and a million microseconds in a second.
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</p>
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<p class='vspace'></p><p>Currently, the largest value that will produce an accurate delay is 16383. This could change in future Arduino releases. For delays longer than a few thousand microseconds, you should use delay() instead.
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<p class='vspace'></p><h4>Syntax</h4>
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<p>delayMicroseconds(us)
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<p class='vspace'></p><h4>Parameters</h4>
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<p>us: the number of microseconds to pause (<em>unsigned int</em>)
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</p>
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<p class='vspace'></p><h4>Returns</h4>
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<p>None
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<p class='vspace'></p><h4>Example</h4>
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<pre>
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int outPin = 8; // digital pin 8
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void setup()
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{
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pinMode(outPin, OUTPUT); // sets the digital pin as output
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}
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void loop()
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{
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digitalWrite(outPin, HIGH); // sets the pin on
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delayMicroseconds(50); // pauses for 50 microseconds
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digitalWrite(outPin, LOW); // sets the pin off
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delayMicroseconds(50); // pauses for 50 microseconds
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}
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</pre>
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<p class='vspace'></p><p>configures pin number 8 to work as an output pin. It sends a train of pulses with 100 microseconds period.
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</p>
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<p class='vspace'></p><h4>Caveats and Known Issues</h4>
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<p>This function works very accurately in the range 3 microseconds and up. We cannot assure that delayMicroseconds will perform precisely for smaller delay-times.
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</p>
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<p class='vspace'></p><p>As of Arduino 0018, delayMicroseconds() no longer disables interrupts.
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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='Millis.html'>millis</a>()
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</li><li><a class='wikilink' href='Micros.html'>micros</a>()
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</li><li><a class='wikilink' href='Delay.html'>delay</a>()
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</li></ul><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://arduino.cc/forum/index.php/board,23.0.html' 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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