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221 lines
42 KiB
221 lines
42 KiB
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url: "https://create.arduino.cc/projecthub/hs_education_georgia/fade-led-without-using-pwm-08a82f?use_route=project",
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title: "Cool stuff: Fade LED without using PWM by chip1264"
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};</script><!-- AddThis Button END --><script type="text/javascript" src="//s7.addthis.com/js/300/addthis_widget.js#pubid=ra-51b26f5613fb83d2" async="async"></script><div class="project-page project-18672" id="content"><div class="container-desktop container"><div class="info-header">Project showcase</div><div class="row"><div class="col-md-8 left-column"><div class="project-banner" id="home"><img alt="Fade LED without using PWM" src="https://create.arduino.cc/assets/whitelabel/arduino/placeholder_proj_cover-b2c93bbd904e5a7da1bf7ecd993fa0d39171960224b84cea8b23dbd5a7ea5df6.svg" /></div><div class="project-banner-inner"><h1 class="project-title">Fade LED without using PWM <a class="copyright" href="http://opensource.org/licenses/GPL-3.0" target="_blank">© GPL3+</a></h1><p class="project-one-liner">Demonstration of fading an LED that is not connected to a PWM pin.</p><ul class="list-inline tags"><li><a class="tag" href="/projecthub/projects/tags/fade">fade</a></li><li><a class="tag" href="/projecthub/projects/tags/lights">lights</a></li><li><a class="tag" href="/projecthub/projects/tags/pwm">pwm</a></li></ul><ul class="list-inline project-stats"><li class="impression-stats"><span class="stat-figure">3,530</span> views</li><li class="comment-stats"><span class="stat-figure">0</span> comments</li><li class="respect-stats"><span class="stat-figure">3</span> respects</li></ul></div><section class="section-container section-collapsible" id="components"><h2 class="section-title"><span class="title title-toggle"><a class="title-anchor" href="#components"><i class="fa fa-link"></i></a><span>Components and supplies</span><i class="fa fa-chevron-down"></i><i class="fa fa-chevron-up"></i></span></h2><div class="section-content"><table class="sortable-table table table-hover fields-container parts-table"><tbody><tr class="fields part-row" id="part-8233"><td class="part-img"><a target="_blank" rel="nofollow noopener" href="/projecthub/products/buy/41?s=BAhJIhYxODY3MixCYXNlQXJ0aWNsZQY6BkVG%0A"><img src="https://hackster.imgix.net/uploads/image/file/160542/A000066_iso_both.jpg?auto=compress%2Cformat&w=140&h=140&fit=fill&bg=ffffff" alt="A000066 iso both" /></a></td><td><table class="part-body" style="width:100%"><tbody><tr class="part-name"><td><a target="_blank" rel="nofollow noopener" href="/projecthub/products/buy/41?s=BAhJIhYxODY3MixCYXNlQXJ0aWNsZQY6BkVG%0A">Arduino UNO & Genuino UNO</a></td></tr><tr class="part-comment"><td style="color: #888;font-size:75%;"></td></tr></tbody></table></td><td style="width:30px;text-align:center;vertical-align:middle"><a target="_blank" rel="nofollow noopener" href="/projecthub/products/buy/41?s=BAhJIhYxODY3MixCYXNlQXJ0aWNsZQY6BkVG%0A">×</a></td><td style="width:10%;min-width:20px;text-align:center;vertical-align:middle"><a target="_blank" rel="nofollow noopener" href="/projecthub/products/buy/41?s=BAhJIhYxODY3MixCYXNlQXJ0aWNsZQY6BkVG%0A">1</a></td><td style="vertical-align:middle"><a target="_blank" style="color:#333" rel="nofollow noopener" href="/projecthub/products/buy/41?s=BAhJIhYxODY3MixCYXNlQXJ0aWNsZQY6BkVG%0A"><i class="fa fa-shopping-cart"></i></a></td></tr></tbody></table></div></section><section class="section-container section-collapsible" id="apps"><h2 class="section-title"><span class="title title-toggle"><a class="title-anchor" href="#apps"><i class="fa fa-link"></i></a><span>Apps and online services</span><i class="fa fa-chevron-down"></i><i class="fa fa-chevron-up"></i></span></h2><div class="section-content"><table class="sortable-table table table-hover fields-container parts-table"><tbody><tr class="fields part-row" id="part-10308"><td class="part-img"><a target="_blank" rel="nofollow noopener" href="https://www.arduino.cc/en/main/software"><img src="https://hackster.imgix.net/uploads/image/file/144203/IDE_web.jpg?auto=compress%2Cformat&w=140&h=140&fit=fill&bg=ffffff" alt="Ide web" /></a></td><td><table class="part-body" style="width:100%"><tbody><tr class="part-name"><td><a target="_blank" rel="nofollow noopener" href="https://www.arduino.cc/en/main/software">Arduino IDE</a></td></tr><tr class="part-comment"><td style="color: #888;font-size:75%;"></td></tr></tbody></table></td><td style="vertical-align:middle"><a target="_blank" style="color:#333" rel="noopener nofollow" href="https://www.arduino.cc/en/main/software"><i class="fa fa-link"></i></a></td></tr></tbody></table></div></section><section class="section-container section-collapsible" id="about-project"><h2 class="section-title"><span class="title title-toggle"><a class="title-anchor" href="#about-project"><i class="fa fa-link"></i></a><span>About this project</span><i class="fa fa-chevron-down"></i><i class="fa fa-chevron-up"></i></span></h2><div class="section-content hljs-active hljs-arduino"><div class="medium-editor"><p data-hash='aKW3'>I wanted to be able to control the brightness of the LED on pin 13 knowing it is not a PWM connected pin. On some of my boards, this LED is quite bright and I would rather have it fade instead of blink.</p></div></div></section><section class="section-container section-collapsible" id="code"><h2 class="section-title"><span class="title title-toggle"><a class="title-anchor" href="#code"><i class="fa fa-link"></i></a><span>Code</span><i class="fa fa-chevron-down"></i><i class="fa fa-chevron-up"></i></span></h2><div class="section-content"><div class="code-widgets single-file "><div class="sidebar"><ul><li><a data-target="#code-widget-57794" class="active" href="javascript:void(0)">FadeWithoutPWM</a></li></ul></div><div class="preview-container"><div class="preview-pane active" id="code-widget-57794"><div class="preview-header"><div class="clearfix"><h5>FadeWithoutPWM<small>Arduino</small></h5><div class="buttons btn-group btn-group-default"><button class="btn btn-primary btn-xs copy-code istooltip" data-container="body" data-trigger="hover" title="Copy the code"><i class="fa fa-clipboard"></i></button><a class="btn btn-primary btn-xs" data-container="body" href="/projecthub/code_files/57794/download" rel="tooltip" title="Download"><i class="fa fa-cloud-download"></i></a></div></div><div class="comment">Example of fading an LED without it being connected to a PWM pin</div></div><div class="preview-body pygments-syntax arduino"><div class="highlight"><pre><span id="line-1"><span class="cm">/* fade w/o pwm</span>
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</span><span id="line-2"><span class="cm"> </span>
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</span><span id="line-3"><span class="cm">Fades an LED that is not connected to a PWM pin</span>
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</span><span id="line-4"><span class="cm">This was modified from the Blink without Delay code</span>
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</span><span id="line-5"><span class="cm"> </span>
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</span><span id="line-6"><span class="cm"> The circuit:</span>
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</span><span id="line-7"><span class="cm"> * LED attached from pin 13 to ground.</span>
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</span><span id="line-8"><span class="cm"> * Note: on most Arduinos, there is already an LED on the board</span>
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</span><span id="line-9"><span class="cm"> that's attached to pin 13, so no hardware is needed for this example.</span>
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</span><span id="line-10"><span class="cm"> </span>
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</span><span id="line-11"><span class="cm"> */</span>
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</span><span id="line-12">
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</span><span id="line-13"><span class="c1">// constants won't change. Used here to set pin numbers:</span>
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</span><span id="line-14"><span class="kr">const</span> <span class="kr">int</span> <span class="n">ledPin</span> <span class="o">=</span> <span class="mi">13</span><span class="p">;</span> <span class="c1">// the number of the LED pin</span>
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</span><span id="line-15">
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</span><span id="line-16"><span class="c1">// Variables will change:</span>
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</span><span id="line-17"><span class="kr">int</span> <span class="n">ledState</span> <span class="o">=</span> <span class="kr">LOW</span><span class="p">;</span> <span class="c1">// ledState used to set the LED</span>
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</span><span id="line-18"><span class="kr">long</span> <span class="n">previousMicros</span> <span class="o">=</span> <span class="mi">0</span><span class="p">;</span> <span class="c1">// will store the last time the blink cycle occured</span>
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</span><span id="line-19">
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</span><span id="line-20"><span class="c1">// the follow variables is a long because the time, measured in microseconds,</span>
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</span><span id="line-21"><span class="c1">// will quickly become a bigger number than can be stored in an int.</span>
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</span><span id="line-22"><span class="kr">long</span> <span class="n">intervalLength</span> <span class="o">=</span> <span class="mi">500</span><span class="p">;</span> <span class="c1">// interval at which to blink (microseconds)</span>
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</span><span id="line-23"><span class="kr">long</span> <span class="n">onInterval</span> <span class="o">=</span> <span class="mi">20</span><span class="p">;</span> <span class="c1">// on or HIGH interval length</span>
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</span><span id="line-24"><span class="kr">long</span> <span class="n">currentInterval</span><span class="p">;</span> <span class="c1">// length of the current interval</span>
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</span><span id="line-25"><span class="kr">int</span> <span class="n">fadeLength</span> <span class="o">=</span> <span class="mi">200</span><span class="p">;</span>
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</span><span id="line-26"><span class="kr">int</span> <span class="n">fadeCount</span> <span class="o">=</span> <span class="mi">0</span><span class="p">;</span>
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</span><span id="line-27"><span class="kr">int</span> <span class="n">intervalDirection</span> <span class="o">=</span> <span class="mi">1</span><span class="p">;</span>
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</span><span id="line-28">
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</span><span id="line-29"><span class="kr">void</span> <span class="nb">setup</span><span class="p">()</span> <span class="p">{</span>
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</span><span id="line-30"> <span class="c1">// set the digital pin as output:</span>
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</span><span id="line-31"> <span class="nf">pinMode</span><span class="p">(</span><span class="n">ledPin</span><span class="p">,</span> <span class="kr">OUTPUT</span><span class="p">);</span>
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</span><span id="line-32"><span class="p">}</span>
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</span><span id="line-33">
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</span><span id="line-34"><span class="kr">void</span> <span class="nb">loop</span><span class="p">()</span>
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</span><span id="line-35"><span class="p">{</span>
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</span><span id="line-36">
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</span><span id="line-37"> <span class="kr">unsigned</span> <span class="kr">long</span> <span class="n">currentMicros</span> <span class="o">=</span> <span class="nf">micros</span><span class="p">();</span>
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</span><span id="line-38">
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</span><span id="line-39"> <span class="n">currentInterval</span> <span class="o">=</span> <span class="n">currentMicros</span> <span class="o">-</span> <span class="n">previousMicros</span><span class="p">;</span>
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</span><span id="line-40">
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</span><span id="line-41"> <span class="k">if</span> <span class="p">(</span><span class="n">currentInterval</span> <span class="o"><=</span> <span class="n">onInterval</span><span class="p">)</span> <span class="p">{</span>
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</span><span id="line-42"> <span class="n">ledState</span> <span class="o">=</span> <span class="kr">HIGH</span><span class="p">;</span>
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</span><span id="line-43"> <span class="p">}</span>
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</span><span id="line-44"> <span class="k">else</span> <span class="p">{</span>
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</span><span id="line-45"> <span class="n">ledState</span> <span class="o">=</span> <span class="kr">LOW</span><span class="p">;</span>
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</span><span id="line-46"> <span class="p">}</span>
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</span><span id="line-47">
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</span><span id="line-48"> <span class="k">if</span><span class="p">(</span><span class="n">currentInterval</span> <span class="o">></span> <span class="n">intervalLength</span><span class="p">)</span> <span class="p">{</span>
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</span><span id="line-49"> <span class="c1">// save the last time you blinked the LED </span>
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</span><span id="line-50"> <span class="n">previousMicros</span> <span class="o">=</span> <span class="n">currentMicros</span><span class="p">;</span>
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</span><span id="line-51"> <span class="n">fadeCount</span><span class="o">++</span><span class="p">;</span>
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</span><span id="line-52"> <span class="k">if</span> <span class="p">(</span><span class="n">fadeCount</span> <span class="o">></span> <span class="n">fadeLength</span><span class="p">)</span> <span class="p">{</span>
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</span><span id="line-53"> <span class="n">fadeCount</span> <span class="o">=</span> <span class="mi">0</span><span class="p">;</span>
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</span><span id="line-54"> <span class="n">onInterval</span> <span class="o">+=</span> <span class="p">(</span><span class="n">intervalDirection</span> <span class="o">*</span> <span class="mi">20</span><span class="p">);</span>
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</span><span id="line-55"> <span class="k">if</span> <span class="p">(</span><span class="n">onInterval</span> <span class="o"><=</span> <span class="mi">20</span> <span class="o">||</span> <span class="n">onInterval</span> <span class="o">>=</span> <span class="n">intervalLength</span><span class="p">)</span> <span class="p">{</span>
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</span><span id="line-56"> <span class="n">intervalDirection</span> <span class="o">*=</span> <span class="o">-</span><span class="mi">1</span><span class="p">;</span> <span class="c1">// change the direction of the fade ( positive - brighter / negative - dimmer)</span>
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</span><span id="line-57"> <span class="p">}</span>
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</span><span id="line-58"> <span class="p">}</span>
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</span><span id="line-59"> <span class="p">}</span>
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</span><span id="line-60">
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</span><span id="line-61"> <span class="c1">// set the LED with the ledState of the variable:</span>
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</span><span id="line-62"> <span class="nf">digitalWrite</span><span class="p">(</span><span class="n">ledPin</span><span class="p">,</span> <span class="n">ledState</span><span class="p">);</span>
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</span><span id="line-63"><span class="p">}</span>
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</span></pre></div></div></div></div></div></div></section><section class="section-container section-collapsible" id="schematics"><h2 class="section-title"><span class="title title-toggle"><a class="title-anchor" href="#schematics"><i class="fa fa-link"></i></a><span>Schematics</span><i class="fa fa-chevron-down"></i><i class="fa fa-chevron-up"></i></span></h2><div class="section-content"><div class="repository"><div class="button-content-container"><div class="button-content"><h5>FadeWithoutPWM</h5><div class="buttons"><a class="btn btn-primary btn-sm" href="https://halckemy.s3.amazonaws.com/uploads/document/file/140945/FadeWithoutPWM.fzz">Download </a></div></div></div><div class="comment">Arduino board with built-in LED on pin 13.</div><div class="document-widget"><div class="file"><i class="fa fa-file-o fa-lg"></i><span>FadeWithoutPWM.fzz</span></div></div></div></div></section><section class="section-container section-collapsible" id="comments"><h2 class="section-title"><span class="title title-toggle"><a class="title-anchor" href="#comments"><i class="fa fa-link"></i></a><span>Comments</span><i class="fa fa-chevron-down"></i><i class="fa fa-chevron-up"></i></span></h2><div class="section-content"><div class="comments"><div class="user-signed-out" style="display:none"><p class="sign-up-to-comment">Please <a href="/projecthub/users/sign_in?id=18672&m=base_article&reason=comment&redirect_to=%2Fprojecthub%2Fhs_education_georgia%2Ffade-led-without-using-pwm-08a82f%23comments">log in</a> or <a href="/projecthub/users/sign_up?id=18672&m=base_article&reason=comment&redirect_to=%2Fprojecthub%2Fhs_education_georgia%2Ffade-led-without-using-pwm-08a82f%23comments&source=popup">sign up</a> to comment.</p></div><div data-react-class="Comments" data-react-props="{"commentable":{"id":"08a82f","type":"projects"},"placeholder":"Share your thoughts! 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$.ajax({
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url: 'https://arduino-api.hackster.io/private/stats',
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data: {
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referrer: (document.referrer || document.origin),
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id: '18672',
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type: 'BaseArticle',
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a: 'show',
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c: 'projects'
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},
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xhrFields: {
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withCredentials: true
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},
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method: 'POST'
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});
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});
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</script><script>$(function(){
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var s = "<span class='stat-figure'>3,632</span> views";
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$('.impression-stats').html(s);
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s = "<span class='stat-figure'>0</span> comments";
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$('.comment-stats').html(s);
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s = "<span class='stat-figure'>3</span> respects";
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$('.respect-stats').html(s);
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});</script><div data-react-class="FeedbackForm" data-react-props="{"project":{"id":18672},"openEvent":"open:feedbackForm","siteName":"Arduino Project Hub"}"></div><script>Utils.clearApiTokens();
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var arduinoAuthenticated = Cookies.get("arduino_authenticated");
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if (arduinoAuthenticated == "true") {
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window.location.href = "https://www.hackster.io/users/auth/arduino?current_site=arduino&setup=true&redirect_to=%2Fprojecthub%2Fhs_education_georgia%2Ffade-led-without-using-pwm-08a82f";
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}</script><script src="/assets/whitelabel/arduino/application-c6236db5026ade4fa3e9115226dc041338e68142149913749589b16f5868c2c4.js"></script><script src="//cdn.arduino.cc/header-footer/loader.js" type="text/javascript"></script> <script> ArduinoHeaderAndFooter({parts: ['create-nav'], auth: 'noauth'}).then(function () { var authDiv = $('#user-signin-signout'); var text = $(authDiv).text(); $(authDiv).find('button').replaceWith('<div class="button mobile-auth-button"><p>'+text+'</p></div>'); $('.grid-nav').append(authDiv); if ($('body').attr('data-user-signed-in')) { var uid = $('body').attr('data-user-name'); $('#add_project span.text').text('new project'); $('#add_project').attr('id', 'new_project'); $('#my_dashboard').attr('href', '/projecthub/' + uid); $('#my_dashboard').removeClass('logged-out'); } $( window ).scroll(function() { if ($(document).scrollTop() > 5) { $('.arduino-bbq').addClass('collapsed'); $('body').addClass('collapsed-nav'); } else { $('.arduino-bbq').removeClass('collapsed'); $('body').removeClass('collapsed-nav'); } }); $('.grid-nav #projecthub').on('click', function(event){ event.preventDefault(); $('#ino-create-nav .menu-toggle').click();}); if (/iPad|iPhone|iPod/.test(navigator.userAgent) && !window.MSStream) { $('body').addClass('ios'); } var url = window.location.href; var queryString = url.split('search?q=')[1]; if (queryString) { var searchBarValue = queryString.split('+').join(' '); $('input#q').val(searchBarValue); } $('.mobile-only').hide(); }); </script><form id="sign-out-form" class="hidden" method="post" action="/projecthub/users/sign_out"><input type="hidden" name="_method" value="delete" /><input type="submit" value="Sign out" /><input type="hidden" name="authenticity_token" value="LphsxFW+2IvYcg7AdrgiJHW0YzEeIflqzn8ILUw70Ep2fdpvWgxDKgsmahSXbReDvx3itVV/3oM2KVlBqytHJg==" /></form></body></html>
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