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<div class="highlight"><pre><div class='line' id='LC1'><span class="err">#</span><span class="n">include</span> <span class="o">&lt;</span><span class="n">Wire</span><span class="o">.</span><span class="na">h</span><span class="o">&gt;</span></div><div class='line' id='LC2'><span class="err">#</span><span class="n">include</span> <span class="s">&quot;Adafruit_MCP23017.h&quot;</span></div><div class='line' id='LC3'><br/></div><div class='line' id='LC4'><span class="c1">// Basic pin reading and pullup test for the MCP23017 I/O expander</span></div><div class='line' id='LC5'><span class="c1">// public domain!</span></div><div class='line' id='LC6'><br/></div><div class='line' id='LC7'><span class="c1">// Connect pin #12 of the expander to Analog 5 (i2c clock)</span></div><div class='line' id='LC8'><span class="c1">// Connect pin #13 of the expander to Analog 4 (i2c data)</span></div><div class='line' id='LC9'><span class="c1">// Connect pins #15, 16 and 17 of the expander to ground (address selection)</span></div><div class='line' id='LC10'><span class="c1">// Connect pin #9 of the expander to 5V (power)</span></div><div class='line' id='LC11'><span class="c1">// Connect pin #10 of the expander to ground (common ground)</span></div><div class='line' id='LC12'><br/></div><div class='line' id='LC13'><span class="c1">// Input #0 is on pin 21 so connect a button or switch from there to ground</span></div><div class='line' id='LC14'><br/></div><div class='line' id='LC15'><span class="n">Adafruit_MCP23017</span> <span class="n">mcp</span><span class="o">;</span></div><div class='line' id='LC16'>&nbsp;&nbsp;</div><div class='line' id='LC17'><span class="kt">void</span> <span class="nf">setup</span><span class="o">()</span> <span class="o">{</span> </div><div class='line' id='LC18'>&nbsp;&nbsp;<span class="n">mcp</span><span class="o">.</span><span class="na">begin</span><span class="o">();</span> <span class="c1">// use default address 0</span></div><div class='line' id='LC19'><br/></div><div class='line' id='LC20'>&nbsp;&nbsp;<span class="n">mcp</span><span class="o">.</span><span class="na">pinMode</span><span class="o">(</span><span class="mi">0</span><span class="o">,</span> <span class="n">INPUT</span><span class="o">);</span></div><div class='line' id='LC21'>&nbsp;&nbsp;<span class="n">mcp</span><span class="o">.</span><span class="na">pullUp</span><span class="o">(</span><span class="mi">0</span><span class="o">,</span> <span class="n">HIGH</span><span class="o">);</span> <span class="c1">// turn on a 100K pullup internally</span></div><div class='line' id='LC22'><br/></div><div class='line' id='LC23'>&nbsp;&nbsp;<span class="n">pinMode</span><span class="o">(</span><span class="mi">13</span><span class="o">,</span> <span class="n">OUTPUT</span><span class="o">);</span> <span class="c1">// use the p13 LED as debugging</span></div><div class='line' id='LC24'><span class="o">}</span></div><div class='line' id='LC25'><br/></div><div class='line' id='LC26'><br/></div><div class='line' id='LC27'><br/></div><div class='line' id='LC28'><span class="kt">void</span> <span class="nf">loop</span><span class="o">()</span> <span class="o">{</span></div><div class='line' id='LC29'>&nbsp;&nbsp;<span class="c1">// The LED will &#39;echo&#39; the button</span></div><div class='line' id='LC30'>&nbsp;&nbsp;<span class="n">digitalWrite</span><span class="o">(</span><span class="mi">13</span><span class="o">,</span> <span class="n">mcp</span><span class="o">.</span><span class="na">digitalRead</span><span class="o">(</span><span class="mi">0</span><span class="o">));</span></div><div class='line' id='LC31'><span class="o">}</span></div></pre></div>
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<ul class="footer_nav">
<h4>Tools</h4>
<li><a href="http://get.gaug.es/">Gauges: Analyze web traffic</a></li>
<li><a href="http://speakerdeck.com">Speaker Deck: Presentations</a></li>
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<li><a href="http://mobile.github.com/">Issues for iPhone</a></li>
<li><a href="http://jobs.github.com/">Job Board</a></li>
</ul>
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<h4>Extras</h4>
<li><a href="http://shop.github.com/">GitHub Shop</a></li>
<li><a href="http://octodex.github.com/">The Octodex</a></li>
</ul>
<ul class="footer_nav">
<h4>Documentation</h4>
<li><a href="http://help.github.com/">GitHub Help</a></li>
<li><a href="http://developer.github.com/">Developer API</a></li>
<li><a href="http://github.github.com/github-flavored-markdown/">GitHub Flavored Markdown</a></li>
<li><a href="http://pages.github.com/">GitHub Pages</a></li>
</ul>
</div><!-- /.site -->
</div><!-- /.upper_footer -->
<div class="lower_footer">
<div class="container clearfix">
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<![if !IE]><div id="legal"><![endif]>
<ul>
<li><a href="https://github.com/site/terms">Terms of Service</a></li>
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<li><a href="https://github.com/security">Security</a></li>
</ul>
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</div><!-- /.lower_footer -->
</div><!-- /#footer -->
<div id="keyboard_shortcuts_pane" class="instapaper_ignore readability-extra" style="display:none">
<h2>Keyboard Shortcuts <small><a href="#" class="js-see-all-keyboard-shortcuts">(see all)</a></small></h2>
<div class="columns threecols">
<div class="column first">
<h3>Site wide shortcuts</h3>
<dl class="keyboard-mappings">
<dt>s</dt>
<dd>Focus site search</dd>
</dl>
<dl class="keyboard-mappings">
<dt>?</dt>
<dd>Bring up this help dialog</dd>
</dl>
</div><!-- /.column.first -->
<div class="column middle" style='display:none'>
<h3>Commit list</h3>
<dl class="keyboard-mappings">
<dt>j</dt>
<dd>Move selection down</dd>
</dl>
<dl class="keyboard-mappings">
<dt>k</dt>
<dd>Move selection up</dd>
</dl>
<dl class="keyboard-mappings">
<dt>c <em>or</em> o <em>or</em> enter</dt>
<dd>Open commit</dd>
</dl>
<dl class="keyboard-mappings">
<dt>y</dt>
<dd>Expand URL to its canonical form</dd>
</dl>
</div><!-- /.column.first -->
<div class="column last" style='display:none'>
<h3>Pull request list</h3>
<dl class="keyboard-mappings">
<dt>j</dt>
<dd>Move selection down</dd>
</dl>
<dl class="keyboard-mappings">
<dt>k</dt>
<dd>Move selection up</dd>
</dl>
<dl class="keyboard-mappings">
<dt>o <em>or</em> enter</dt>
<dd>Open issue</dd>
</dl>
<dl class="keyboard-mappings">
<dt><span class="platform-mac">⌘</span><span class="platform-other">ctrl</span> <em>+</em> enter</dt>
<dd>Submit comment</dd>
</dl>
</div><!-- /.columns.last -->
</div><!-- /.columns.equacols -->
<div style='display:none'>
<div class="rule"></div>
<h3>Issues</h3>
<div class="columns threecols">
<div class="column first">
<dl class="keyboard-mappings">
<dt>j</dt>
<dd>Move selection down</dd>
</dl>
<dl class="keyboard-mappings">
<dt>k</dt>
<dd>Move selection up</dd>
</dl>
<dl class="keyboard-mappings">
<dt>x</dt>
<dd>Toggle selection</dd>
</dl>
<dl class="keyboard-mappings">
<dt>o <em>or</em> enter</dt>
<dd>Open issue</dd>
</dl>
<dl class="keyboard-mappings">
<dt><span class="platform-mac">⌘</span><span class="platform-other">ctrl</span> <em>+</em> enter</dt>
<dd>Submit comment</dd>
</dl>
</div><!-- /.column.first -->
<div class="column last">
<dl class="keyboard-mappings">
<dt>c</dt>
<dd>Create issue</dd>
</dl>
<dl class="keyboard-mappings">
<dt>l</dt>
<dd>Create label</dd>
</dl>
<dl class="keyboard-mappings">
<dt>i</dt>
<dd>Back to inbox</dd>
</dl>
<dl class="keyboard-mappings">
<dt>u</dt>
<dd>Back to issues</dd>
</dl>
<dl class="keyboard-mappings">
<dt>/</dt>
<dd>Focus issues search</dd>
</dl>
</div>
</div>
</div>
<div style='display:none'>
<div class="rule"></div>
<h3>Issues Dashboard</h3>
<div class="columns threecols">
<div class="column first">
<dl class="keyboard-mappings">
<dt>j</dt>
<dd>Move selection down</dd>
</dl>
<dl class="keyboard-mappings">
<dt>k</dt>
<dd>Move selection up</dd>
</dl>
<dl class="keyboard-mappings">
<dt>o <em>or</em> enter</dt>
<dd>Open issue</dd>
</dl>
</div><!-- /.column.first -->
</div>
</div>
<div style='display:none'>
<div class="rule"></div>
<h3>Network Graph</h3>
<div class="columns equacols">
<div class="column first">
<dl class="keyboard-mappings">
<dt><span class="badmono">←</span> <em>or</em> h</dt>
<dd>Scroll left</dd>
</dl>
<dl class="keyboard-mappings">
<dt><span class="badmono">→</span> <em>or</em> l</dt>
<dd>Scroll right</dd>
</dl>
<dl class="keyboard-mappings">
<dt><span class="badmono">↑</span> <em>or</em> k</dt>
<dd>Scroll up</dd>
</dl>
<dl class="keyboard-mappings">
<dt><span class="badmono">↓</span> <em>or</em> j</dt>
<dd>Scroll down</dd>
</dl>
<dl class="keyboard-mappings">
<dt>t</dt>
<dd>Toggle visibility of head labels</dd>
</dl>
</div><!-- /.column.first -->
<div class="column last">
<dl class="keyboard-mappings">
<dt>shift <span class="badmono">←</span> <em>or</em> shift h</dt>
<dd>Scroll all the way left</dd>
</dl>
<dl class="keyboard-mappings">
<dt>shift <span class="badmono">→</span> <em>or</em> shift l</dt>
<dd>Scroll all the way right</dd>
</dl>
<dl class="keyboard-mappings">
<dt>shift <span class="badmono">↑</span> <em>or</em> shift k</dt>
<dd>Scroll all the way up</dd>
</dl>
<dl class="keyboard-mappings">
<dt>shift <span class="badmono">↓</span> <em>or</em> shift j</dt>
<dd>Scroll all the way down</dd>
</dl>
</div><!-- /.column.last -->
</div>
</div>
<div >
<div class="rule"></div>
<div class="columns threecols">
<div class="column first" >
<h3>Source Code Browsing</h3>
<dl class="keyboard-mappings">
<dt>t</dt>
<dd>Activates the file finder</dd>
</dl>
<dl class="keyboard-mappings">
<dt>l</dt>
<dd>Jump to line</dd>
</dl>
<dl class="keyboard-mappings">
<dt>w</dt>
<dd>Switch branch/tag</dd>
</dl>
<dl class="keyboard-mappings">
<dt>y</dt>
<dd>Expand URL to its canonical form</dd>
</dl>
</div>
</div>
</div>
<div style='display:none'>
<div class="rule"></div>
<div class="columns threecols">
<div class="column first">
<h3>Browsing Commits</h3>
<dl class="keyboard-mappings">
<dt><span class="platform-mac">⌘</span><span class="platform-other">ctrl</span> <em>+</em> enter</dt>
<dd>Submit comment</dd>
</dl>
<dl class="keyboard-mappings">
<dt>escape</dt>
<dd>Close form</dd>
</dl>
<dl class="keyboard-mappings">
<dt>p</dt>
<dd>Parent commit</dd>
</dl>
<dl class="keyboard-mappings">
<dt>o</dt>
<dd>Other parent commit</dd>
</dl>
</div>
</div>
</div>
</div>
<div id="markdown-help" class="instapaper_ignore readability-extra">
<h2>Markdown Cheat Sheet</h2>
<div class="cheatsheet-content">
<div class="mod">
<div class="col">
<h3>Format Text</h3>
<p>Headers</p>
<pre>
# This is an &lt;h1&gt; tag
## This is an &lt;h2&gt; tag
###### This is an &lt;h6&gt; tag</pre>
<p>Text styles</p>
<pre>
*This text will be italic*
_This will also be italic_
**This text will be bold**
__This will also be bold__
*You **can** combine them*
</pre>
</div>
<div class="col">
<h3>Lists</h3>
<p>Unordered</p>
<pre>
* Item 1
* Item 2
* Item 2a
* Item 2b</pre>
<p>Ordered</p>
<pre>
1. Item 1
2. Item 2
3. Item 3
* Item 3a
* Item 3b</pre>
</div>
<div class="col">
<h3>Miscellaneous</h3>
<p>Images</p>
<pre>
![GitHub Logo](/images/logo.png)
Format: ![Alt Text](url)
</pre>
<p>Links</p>
<pre>
http://github.com - automatic!
[GitHub](http://github.com)</pre>
<p>Blockquotes</p>
<pre>
As Kanye West said:
> We're living the future so
> the present is our past.
</pre>
</div>
</div>
<div class="rule"></div>
<h3>Code Examples in Markdown</h3>
<div class="col">
<p>Syntax highlighting with <a href="http://github.github.com/github-flavored-markdown/" title="GitHub Flavored Markdown" target="_blank">GFM</a></p>
<pre>
```javascript
function fancyAlert(arg) {
if(arg) {
$.facebox({div:'#foo'})
}
}
```</pre>
</div>
<div class="col">
<p>Or, indent your code 4 spaces</p>
<pre>
Here is a Python code example
without syntax highlighting:
def foo:
if not bar:
return true</pre>
</div>
<div class="col">
<p>Inline code for comments</p>
<pre>
I think you should use an
`&lt;addr&gt;` element here instead.</pre>
</div>
</div>
</div>
</div>
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<h4>GitHub Logo</h4>
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</li>
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<a href="http://github-media-downloads.s3.amazonaws.com/Octocats.zip" class="minibutton btn-download download"><span><span class="icon"></span>Download</span></a>
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