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533 lines
33 KiB
HTML
533 lines
33 KiB
HTML
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<title>Raspberry Pi camera/LED demo</title>
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a{color:inherit!important;text-decoration:underline!important}
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body.book #header{text-align:center}
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body.book #header>h1:first-child{border:0!important;margin:2.5em 0 1em 0}
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body.book #header .details br+span:before{content:none!important}
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body.book #toc{border:0!important;text-align:left!important;padding:0!important;margin:0!important}
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body.book #toc,body.book #preamble,body.book h1.sect0,body.book .sect1>h2{page-break-before:always}
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|
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</style>
|
|
</head>
|
|
<body class="article">
|
|
<div id="header">
|
|
<h1>Raspberry Pi camera/LED demo</h1>
|
|
</div>
|
|
<div id="content">
|
|
<div class="sect1">
|
|
<h2 id="_overview">Overview</h2>
|
|
<div class="sectionbody">
|
|
<div class="paragraph">
|
|
<p>The <a href="/">demo</a> consists of web app providing access to a webcam and a LED attached to a RaspberryPi.
|
|
The device is assumed to have a limited bandwidth towards the server hosting the web app.</p>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="_objective">Objective</h2>
|
|
<div class="sectionbody">
|
|
<div class="paragraph">
|
|
<p>The demo shows how to use websockets to communicate bidirectionally with an embedded device using standard protocols.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>It also shows that it’s possible to use Smart.c to develop also the cloud endpoint and expose WebSocket and RESTful APIs
|
|
easy to integreate with modern web stacks.</p>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="_how_it_works">How it works</h2>
|
|
<div class="sectionbody">
|
|
<div class="imageblock">
|
|
<div class="content">
|
|
<img src="docs/arch.png" alt="arch">
|
|
</div>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>There are two components, once with runs on the device (<code>device_side</code>) and one that runs on a stronger machine
|
|
and with more bandwidth (<code>cloud_side</code>).</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>The device app connects to the cloud app via websocket and sends a new jpeg frame as fast as the underlying <code>raspistill</code> camera
|
|
grabbing application can handle. The device automatically attempts reconnecting.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>The cloud side serves the webapp static pages and serves an MPJEG image on <code>/mpjg</code>.
|
|
The MPJEG image handler blocks all the clients until a JPEG frame arrives via websocket
|
|
and then every client will receive a copy of the frame.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>The web app can turn on and off the LED via a RESTful api accessible via the <code>/api</code> handler.</p>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="_installation">Installation</h2>
|
|
<div class="sectionbody">
|
|
<div class="sect2">
|
|
<h3 id="_server_side">Server side</h3>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>git clone https://github.com/cesanta/mongoose
|
|
cd mongoose/examples/web_demo
|
|
make cloud_side && ./cloud_side 0.0.0.0:8080</pre>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div class="sect2">
|
|
<h3 id="_raspberry_pi">Raspberry Pi</h3>
|
|
<div class="paragraph">
|
|
<p>The instructions provided here are tailored for the Raspbian distribution.</p>
|
|
</div>
|
|
<div class="sect3">
|
|
<h4 id="_dependencies">Dependencies</h4>
|
|
<div class="dlist">
|
|
<dl>
|
|
<dt class="hdlist1">jpegoptim</dt>
|
|
<dd>
|
|
<p>apt-get install jpegoptim</p>
|
|
</dd>
|
|
<dt class="hdlist1">camera</dt>
|
|
<dd>
|
|
<p>run raspi-config and enable camera</p>
|
|
</dd>
|
|
</dl>
|
|
</div>
|
|
</div>
|
|
<div class="sect3">
|
|
<h4 id="_led">LED</h4>
|
|
<div class="paragraph">
|
|
<p>In order to access the led on your <a href="http://www.qdh.org.uk/wordpress/?page_id=15">HotPi</a>
|
|
board you need to export the gpio pins:</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>for i in 22 23 24; do
|
|
echo $i >/sys/class/gpio/export
|
|
echo out >/sys/class/gpio/gpio$i/direction
|
|
chgrp pi /sys/class/gpio/gpio$i/value
|
|
done</pre>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div class="sect3">
|
|
<h4 id="_build_and_run">Build and run</h4>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>git clone https://github.com/cesanta/mongoose
|
|
cd mongoose/examples/web_demo
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make device_side && ./device_side yourserver:8080</pre>
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Last updated 2014-11-03 21:30:06 GMT
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