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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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<title>Arduino - DigitalRead </title>
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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>digitalRead()</h2>
<h4>Description</h4>
<p>Reads the value from a specified digital pin, either <a class='wikilink' href='Constants.html'>HIGH</a> or <a class='wikilink' href='Constants.html'>LOW</a>.
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<p class='vspace'></p><h4>Syntax</h4>
<p>digitalRead(pin)
</p>
<p class='vspace'></p><h4>Parameters</h4>
<p>pin: the number of the digital pin you want to read (<em>int</em>)
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<p class='vspace'></p><h4>Returns</h4>
<p><a class='wikilink' href='Constants.html'>HIGH</a> or <a class='wikilink' href='Constants.html'>LOW</a>
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<p class='vspace'></p><h4>Example</h4>
<pre>
int ledPin = 13; // LED connected to digital pin 13
int inPin = 7; // pushbutton connected to digital pin 7
int val = 0; // variable to store the read value
void setup()
{
pinMode(ledPin, OUTPUT); // sets the digital pin 13 as output
pinMode(inPin, INPUT); // sets the digital pin 7 as input
}
void loop()
{
val = digitalRead(inPin); // read the input pin
digitalWrite(ledPin, val); // sets the LED to the button's value
}
</pre>
<p class='vspace'></p><p>Sets pin 13 to the same value as the pin 7, which is an input.
</p>
<p class='vspace'></p><h4>Note</h4>
<p>If the pin isn't connected to anything, digitalRead() can return either HIGH or LOW (and this can change randomly).
</p>
<p class='vspace'></p><p>The analog input pins can be used as digital pins w/ numbers 14 (analog input 0) to 19 (analog input 5).
</p>
<p class='vspace'></p><h4>See also</h4>
<ul><li><a class='wikilink' href='PinMode.html'>pinMode</a>()
</li><li><a class='wikilink' href='DigitalWrite.html'>digitalWrite</a>()
</li><li><a class='wikilink' href='http://arduino.cc/en/Tutorial/DigitalPins'>Tutorial: Digital Pins</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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