194 lines
7.4 KiB
HTML
194 lines
7.4 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
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<head>
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<title>LED \ Language (API) \ Processing 2+</title>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta name="Author" content="Processing Foundation" />
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<meta name="Publisher" content="Processing Foundation" />
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<meta name="Keywords" content="Processing, Sketchbook, Programming, Coding, Code, Art, Design" />
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<meta name="Description" content="Processing is a flexible software sketchbook and a language for learning how to code within the context of the visual arts. Since 2001, Processing has promoted software literacy within the visual arts and visual literacy within technology." />
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<meta name="Copyright" content="All contents copyright the Processing Foundation, Ben Fry, Casey Reas, and the MIT Media Laboratory" />
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<body id="Langauge-en" onload="" >
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<ul class="left">
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<li class="highlight"><a href="http://processing.org/">Processing</a></li>
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<li><a href="http://p5js.org/">p5.js</a></li>
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<li><a href="http://py.processing.org/">Processing.py</a></li>
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<li><a href="http://android.processing.org/">Processing for Android</a></li>
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<li><a href="https://processingfoundation.org/">Processing Foundation</a></li>
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<a href="/" title="Back to the Processing cover."><div class="processing-logo no-cover" alt="Processing cover"></div></a>
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<a id="TOP" name="TOP"></a>
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<div id="navigation">
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<div class="navBar" id="mainnav">
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<a href="../../index.html" >Language</a><br>
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<a href="../../libraries/index.html" class='active'>Libraries</a><br>
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<a href="../../tools/index.html">Tools</a><br>
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<a href="../../environment/index.html">Environment</a><br>
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<script> document.querySelectorAll(".processing-logo")[0].className = "processing-logo"; </script>
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<!-- ==================================== CONTENT - Headers ============================ -->
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<div class="content">
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<p class="ref-notice">This reference is for Processing 3.0+. If you have a previous version, use the reference included with your software in the Help menu. If you see any errors or have suggestions, <a href="https://github.com/processing/processing-docs/issues?state=open">please let us know</a>. If you prefer a more technical reference, visit the <a href="http://processing.github.io/processing-javadocs/core/">Processing Core Javadoc</a> and <a href="http://processing.github.io/processing-javadocs/libraries/">Libraries Javadoc</a>.</p>
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<table cellpadding="0" cellspacing="0" border="0" class="ref-item">
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<tr class="name-row">
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<th scope="row">Name</th>
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<td><h3>LED</h3></td>
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</tr>
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<tr class=""><th scope="row">Examples</th><td><div class="example"><pre >
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import processing.io.*;
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LED greenLed;
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boolean ledOn = false;
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void setup() {
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// the green LED is led0 on the Raspberry Pi
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greenLed = new LED(LED.list()[0]);
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frameRate(0.5);
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}
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void draw() {
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ledOn = !ledOn;
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if (ledOn) {
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greenLed.set(1.0);
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} else {
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greenLed.set(0.0);
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}
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}
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</pre></div>
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</td></tr>
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<tr class="">
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<th scope="row">Description</th>
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<td>
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Opens a LED device<br/>
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<br/>
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This class can control your computer's build-in LEDs, such as the ones
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commonly used to indicate the power status and disk activity.</br>
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<br/>
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Your operating system might not be set up to allow regular users to do
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this kind of modification. If this is the case you should install a
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so-called <i>udev rule</i> that relaxes the permissions for the files
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in /sys/class/leds. You can also try running Processing as root user
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using "sudo", but this is generally not recommended.
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</td>
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</tr>
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<tr class=""><th scope="row">Methods</th><td><table cellpadding="0" cellspacing="0" border="0"><tr class="">
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<th scope="row"><a href="LED_brightness_.html">brightness()</a></th>
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<td>Sets the brightness</td>
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</tr>
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<tr class="">
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<th scope="row"><a href="LED_close_.html">close()</a></th>
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<td>Restores the previous state</td>
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</tr>
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<tr class="">
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<th scope="row"><a href="LED_list_.html">list()</a></th>
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<td>Lists all available LED devices</td>
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</tr></table></td></tr>
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<tr class=""><th scope="row">Constructor</th><td><pre>LED(<kbd>dev</kbd>)
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</pre></td></tr>
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<tr class=""> <th scope="row">Parameters</th><td><table cellpadding="0" cellspacing="0" border="0"><tr class="">
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<th scope="row" class="code">dev</th>
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<td>String: device name</td>
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</tr></table></td> </tr>
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</table>
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Updated on April 30, 2017 02:33:20pm EDT<br /><br />
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