100 lines
4.6 KiB
HTML
100 lines
4.6 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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<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>micros()</h2>
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<h4>Description</h4>
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<p>Returns the number of microseconds since the Arduino board began running the current program. This number will overflow (go back to zero), after approximately 70 minutes. On 16 <span class='wikiword'>MHz</span> Arduino boards (e.g. Duemilanove and Nano), this function has a resolution of four microseconds (i.e. the value returned is always a multiple of four). On 8 <span class='wikiword'>MHz</span> Arduino boards (e.g. the <span class='wikiword'>LilyPad</span>), this function has a resolution of eight microseconds.
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<p class='vspace'></p><p><em>Note</em>: there are 1,000 microseconds in a millisecond and 1,000,000 microseconds in a second.
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<p class='vspace'></p><h4>Parameters</h4>
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<p>None
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</p>
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<p class='vspace'></p><h4>Returns</h4>
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<p>Number of microseconds since the program started (<em>unsigned long</em>)
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</p>
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<p class='vspace'></p><h4>Example</h4>
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<pre>
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unsigned long time;
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void setup(){
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Serial.begin(9600);
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}
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void loop(){
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Serial.print("Time: ");
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time = micros();
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//prints time since program started
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Serial.println(time);
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// wait a second so as not to send massive amounts of data
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delay(1000);
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}
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</pre>
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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='Delay.html'>delay</a>()
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</li><li><a class='wikilink' href='DelayMicroseconds.html'>delayMicroseconds</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 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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