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Code_documentation.md.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>Code_documentation</title>
<style>.markdown-preview:not([data-use-github-style]) { padding: 2em; font-size: 1.2em; color: rgb(171, 178, 191); background-color: rgb(40, 44, 52); overflow: auto; }
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.markdown-preview:not([data-use-github-style]) h1 { font-size: 2.4em; font-weight: 300; }
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}
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}
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<body class='markdown-preview' data-use-github-style><h1 id="ffsino">ffs.ino</h1>
<p>The following program will take the accelerometer data and log it to the serial port</p>
<pre class="editor-colors lang-cpp"><div class="line"><span class="syntax--source syntax--cpp"><span class="syntax--keyword syntax--control syntax--directive">#include</span> <span class="syntax--string syntax--quoted syntax--double"><span class="syntax--punctuation syntax--definition syntax--string">"</span>Wire.h<span class="syntax--punctuation syntax--definition syntax--string">"</span></span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="syntax--keyword syntax--control syntax--directive">#include</span> <span class="syntax--string syntax--quoted syntax--double"><span class="syntax--punctuation syntax--definition syntax--string">"</span>LSM303.h<span class="syntax--punctuation syntax--definition syntax--string">"</span></span></span></div><div class="line"></div><div class="line"><span class="syntax--source syntax--cpp"><span class="syntax--support syntax--storage syntax--type">LSM303</span> sensor<span class="syntax--punctuation syntax--terminator syntax--statement">;</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="syntax--support syntax--storage syntax--type">char</span> report<span class="syntax--punctuation syntax--definition syntax--begin syntax--bracket syntax--square">[</span><span class="syntax--constant syntax--numeric syntax--decimal">80</span><span class="syntax--punctuation syntax--definition syntax--end syntax--bracket syntax--square">]</span><span class="syntax--punctuation syntax--terminator syntax--statement">;</span></span></div><div class="line"></div><div class="line"><span class="syntax--source syntax--cpp"><span class="syntax--support syntax--storage syntax--type">void</span> <span class="syntax--entity syntax--name syntax--function">setup</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span><span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span> <span class="syntax--punctuation syntax--section syntax--block syntax--begin syntax--bracket syntax--curly">{</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="leading-whitespace"> </span>Serial<span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--entity syntax--name syntax--function">begin</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span><span class="syntax--constant syntax--numeric syntax--decimal">115200</span><span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span><span class="syntax--punctuation syntax--terminator syntax--statement">;</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="leading-whitespace"> </span>Wire<span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--entity syntax--name syntax--function">begin</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span><span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span><span class="syntax--punctuation syntax--terminator syntax--statement">;</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="leading-whitespace"> </span>sensor<span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--entity syntax--name syntax--function">init</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span><span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span><span class="syntax--punctuation syntax--terminator syntax--statement">;</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="leading-whitespace"> </span>sensor<span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--entity syntax--name syntax--function">enableDefault</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span><span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span><span class="syntax--punctuation syntax--terminator syntax--statement">;</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="syntax--punctuation syntax--section syntax--block syntax--end syntax--bracket syntax--curly">}</span></span></div><div class="line"></div><div class="line"><span class="syntax--source syntax--cpp"><span class="syntax--support syntax--storage syntax--type">void</span> <span class="syntax--entity syntax--name syntax--function">loop</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span><span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span> <span class="syntax--punctuation syntax--section syntax--block syntax--begin syntax--bracket syntax--curly">{</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="leading-whitespace"> </span>sensor<span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--entity syntax--name syntax--function">read</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span><span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span><span class="syntax--punctuation syntax--terminator syntax--statement">;</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="leading-whitespace"> </span><span class="syntax--entity syntax--name syntax--function">snprintf</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span>report, <span class="syntax--keyword syntax--operator syntax--sizeof">sizeof</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span>report<span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span>, <span class="syntax--string syntax--quoted syntax--double"><span class="syntax--punctuation syntax--definition syntax--string">"</span>%6d,%6d,%6d<span class="syntax--punctuation syntax--definition syntax--string">"</span></span>,</span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="leading-whitespace"> </span>sensor<span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--variable syntax--other syntax--member">a</span><span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--variable syntax--other syntax--member">x</span>, sensor<span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--variable syntax--other syntax--member">a</span><span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--variable syntax--other syntax--member">y</span>, sensor<span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--variable syntax--other syntax--member">a</span><span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--variable syntax--other syntax--member">z</span><span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span><span class="syntax--punctuation syntax--terminator syntax--statement">;</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="leading-whitespace"> </span>Serial<span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--entity syntax--name syntax--function">println</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span>report<span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span><span class="syntax--punctuation syntax--terminator syntax--statement">;</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="leading-whitespace"> </span><span class="syntax--entity syntax--name syntax--function">delay</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span><span class="syntax--constant syntax--numeric syntax--decimal">10</span><span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span><span class="syntax--punctuation syntax--terminator syntax--statement">;</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="syntax--punctuation syntax--section syntax--block syntax--end syntax--bracket syntax--curly">}</span></span></div></pre>
<h2 id="explanation">Explanation</h2>
<pre class="editor-colors lang-cpp"><div class="line"><span class="syntax--source syntax--cpp"><span class="syntax--keyword syntax--control syntax--directive">#include</span> <span class="syntax--string syntax--quoted syntax--double"><span class="syntax--punctuation syntax--definition syntax--string">"</span>Wire.h<span class="syntax--punctuation syntax--definition syntax--string">"</span></span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="syntax--keyword syntax--control syntax--directive">#include</span> <span class="syntax--string syntax--quoted syntax--double"><span class="syntax--punctuation syntax--definition syntax--string">"</span>LSM303.h<span class="syntax--punctuation syntax--definition syntax--string">"</span></span></span></div></pre>
<p>These lines add the required libraries, the important one being LSM303 to read data from the accelerometer</p>
<pre class="editor-colors lang-cpp"><div class="line"><span class="syntax--source syntax--cpp"><span class="syntax--support syntax--storage syntax--type">LSM303</span> sensor<span class="syntax--punctuation syntax--terminator syntax--statement">;</span></span></div></pre>
<p>We create a sensor object, which lets us interface with the accelerometer (connected via i2c)</p>
<pre class="editor-colors lang-cpp"><div class="line"><span class="syntax--source syntax--cpp"><span class="syntax--support syntax--storage syntax--type">char</span> report<span class="syntax--punctuation syntax--definition syntax--begin syntax--bracket syntax--square">[</span><span class="syntax--constant syntax--numeric syntax--decimal">80</span><span class="syntax--punctuation syntax--definition syntax--end syntax--bracket syntax--square">]</span><span class="syntax--punctuation syntax--terminator syntax--statement">;</span></span></div></pre>
<p>Report is the string that will get sent to the serial port</p>
<pre class="editor-colors lang-cpp"><div class="line"><span class="syntax--source syntax--cpp"><span class="syntax--support syntax--storage syntax--type">void</span> <span class="syntax--entity syntax--name syntax--function">setup</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span><span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span> <span class="syntax--punctuation syntax--section syntax--block syntax--begin syntax--bracket syntax--curly">{</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="leading-whitespace"> </span><span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--keyword syntax--operator syntax--member">.</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="syntax--punctuation syntax--section syntax--block syntax--end syntax--bracket syntax--curly">}</span></span></div></pre>
<p>The setup function will run once, when the board boots up</p>
<pre class="editor-colors lang-cpp"><div class="line"><span class="syntax--source syntax--cpp">Serial<span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--entity syntax--name syntax--function">begin</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span><span class="syntax--constant syntax--numeric syntax--decimal">115200</span><span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span><span class="syntax--punctuation syntax--terminator syntax--statement">;</span></span></div></pre>
<p>This will open the serial connection to the computer at a baud rate (=speed) of 115200</p>
<pre class="editor-colors lang-cpp"><div class="line"><span class="syntax--source syntax--cpp">Wire<span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--entity syntax--name syntax--function">begin</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span><span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span><span class="syntax--punctuation syntax--terminator syntax--statement">;</span></span></div></pre>
<p>This tells the Wire library to start (Wire.h handles i2c connections)</p>
<pre class="editor-colors lang-cpp"><div class="line"><span class="syntax--source syntax--cpp">sensor<span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--entity syntax--name syntax--function">init</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span><span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span></span></div><div class="line"><span class="syntax--source syntax--cpp">sensor<span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--entity syntax--name syntax--function">enableDefault</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span><span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span></span></div></pre>
<p>Here we tell the sensor to start</p>
<pre class="editor-colors lang-cpp"><div class="line"><span class="syntax--source syntax--cpp"><span class="syntax--support syntax--storage syntax--type">void</span> <span class="syntax--entity syntax--name syntax--function">loop</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span><span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span> <span class="syntax--punctuation syntax--section syntax--block syntax--begin syntax--bracket syntax--curly">{</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="leading-whitespace"> </span><span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--keyword syntax--operator syntax--member">.</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="syntax--punctuation syntax--section syntax--block syntax--end syntax--bracket syntax--curly">}</span></span></div></pre>
<p>The loop function gets called repeatedly, once the setup function has finished</p>
<pre class="editor-colors lang-cpp"><div class="line"><span class="syntax--source syntax--cpp">sensor<span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--entity syntax--name syntax--function">read</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span><span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span><span class="syntax--punctuation syntax--terminator syntax--statement">;</span></span></div></pre>
<p>This tells the accelerometer to read the current acceleration. The readings are stored in the field of the sensor object and can be accessed with <code style="font-family: Menlo, Consolas, "DejaVu Sans Mono", monospace;">sensor.a.x</code> (for example)</p>
<pre class="editor-colors lang-cpp"><div class="line"><span class="syntax--source syntax--cpp"><span class="syntax--entity syntax--name syntax--function">snprinf</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span>report, <span class="syntax--keyword syntax--operator syntax--sizeof">sizeof</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span>report<span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span>, <span class="syntax--string syntax--quoted syntax--double"><span class="syntax--punctuation syntax--definition syntax--string">"</span>%6d,%6d,%6d<span class="syntax--punctuation syntax--definition syntax--string">"</span></span>, sensor<span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--variable syntax--other syntax--member">a</span><span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--variable syntax--other syntax--member">x</span>, sensor<span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--variable syntax--other syntax--member">a</span><span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--variable syntax--other syntax--member">y</span>, sensor<span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--variable syntax--other syntax--member">a</span><span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--variable syntax--other syntax--member">z</span><span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span></span></div></pre>
<p>The snprintf function is used for string formatting. The first two arguments are the variable it should write to and the length of the variable. The next argument is a template string into which snprintf should place the values <code style="font-family: Menlo, Consolas, "DejaVu Sans Mono", monospace;">sensor.a.x, sensor.a.y, sensor.a.z</code>. %6d is a placeholder for an integer</p>
<pre class="editor-colors lang-cpp"><div class="line"><span class="syntax--source syntax--cpp">Serial<span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--entity syntax--name syntax--function">println</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span>report<span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span><span class="syntax--punctuation syntax--terminator syntax--statement">;</span></span></div></pre>
<p>Prints the data (which will look like <code style="font-family: Menlo, Consolas, "DejaVu Sans Mono", monospace;">-15644,761,-5964</code>) to the serial port</p>
<pre class="editor-colors lang-cpp"><div class="line"><span class="syntax--source syntax--cpp"><span class="syntax--entity syntax--name syntax--function">delay</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span><span class="syntax--constant syntax--numeric syntax--decimal">10</span><span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span><span class="syntax--punctuation syntax--terminator syntax--statement">;</span></span></div></pre>
<p>Waits for 10 ms</p>
<h1 id="sd_loggingino">sd_logging.ino</h1>
<p>This program will take the data and put it on the SD card</p>
<pre class="editor-colors lang-cpp"><div class="line"><span class="syntax--source syntax--cpp"><span class="syntax--keyword syntax--control syntax--directive">#include</span> <span class="syntax--string syntax--quoted syntax--double"><span class="syntax--punctuation syntax--definition syntax--string">"</span>FS.h<span class="syntax--punctuation syntax--definition syntax--string">"</span></span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="syntax--keyword syntax--control syntax--directive">#include</span> <span class="syntax--string syntax--quoted syntax--double"><span class="syntax--punctuation syntax--definition syntax--string">"</span>SD.h<span class="syntax--punctuation syntax--definition syntax--string">"</span></span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="syntax--keyword syntax--control syntax--directive">#include</span> <span class="syntax--string syntax--quoted syntax--double"><span class="syntax--punctuation syntax--definition syntax--string">"</span>SPI.h<span class="syntax--punctuation syntax--definition syntax--string">"</span></span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="syntax--keyword syntax--control syntax--directive">#include</span> <span class="syntax--string syntax--quoted syntax--double"><span class="syntax--punctuation syntax--definition syntax--string">"</span>Wire.h<span class="syntax--punctuation syntax--definition syntax--string">"</span></span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="syntax--keyword syntax--control syntax--directive">#include</span> <span class="syntax--string syntax--quoted syntax--other"><LSM303.h></span></span></div><div class="line"></div><div class="line"><span class="syntax--source syntax--cpp"><span class="syntax--support syntax--storage syntax--type">LSM303</span> sensor<span class="syntax--punctuation syntax--terminator syntax--statement">;</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="syntax--support syntax--storage syntax--type">char</span><span class="syntax--keyword syntax--operator">*</span> outS <span class="syntax--keyword syntax--operator">=</span> <span class="syntax--keyword syntax--operator">new</span> <span class="syntax--support syntax--storage syntax--type">char</span><span class="syntax--punctuation syntax--definition syntax--begin syntax--bracket syntax--square">[</span><span class="syntax--constant syntax--numeric syntax--decimal">300</span><span class="syntax--punctuation syntax--definition syntax--end syntax--bracket syntax--square">]</span><span class="syntax--punctuation syntax--terminator syntax--statement">;</span></span></div><div class="line"></div><div class="line"><span class="syntax--source syntax--cpp"><span class="syntax--support syntax--storage syntax--type">void</span> <span class="syntax--entity syntax--name syntax--function">setup</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span><span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span> <span class="syntax--punctuation syntax--section syntax--block syntax--begin syntax--bracket syntax--curly">{</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="leading-whitespace"> </span>Serial<span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--entity syntax--name syntax--function">begin</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span><span class="syntax--constant syntax--numeric syntax--decimal">115200</span><span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span><span class="syntax--punctuation syntax--terminator syntax--statement">;</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="leading-whitespace"> </span><span class="syntax--keyword syntax--control">if</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span><span class="syntax--keyword syntax--operator">!</span><span class="syntax--constant syntax--other">SD</span><span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--entity syntax--name syntax--function">begin</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span><span class="syntax--constant syntax--numeric syntax--decimal">5</span><span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span><span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span> <span class="syntax--punctuation syntax--section syntax--block syntax--begin syntax--bracket syntax--curly">{</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="leading-whitespace"> </span>Serial<span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--entity syntax--name syntax--function">println</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span><span class="syntax--string syntax--quoted syntax--double"><span class="syntax--punctuation syntax--definition syntax--string">"</span>Card Mount Failed<span class="syntax--punctuation syntax--definition syntax--string">"</span></span><span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span><span class="syntax--punctuation syntax--terminator syntax--statement">;</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="leading-whitespace"> </span><span class="syntax--keyword syntax--control">return</span><span class="syntax--punctuation syntax--terminator syntax--statement">;</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="leading-whitespace"> </span><span class="syntax--punctuation syntax--section syntax--block syntax--end syntax--bracket syntax--curly">}</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="leading-whitespace"> </span><span class="syntax--support syntax--storage syntax--type">uint8_t</span> cardType <span class="syntax--keyword syntax--operator">=</span> <span class="syntax--constant syntax--other">SD</span><span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--entity syntax--name syntax--function">cardType</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span><span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span><span class="syntax--punctuation syntax--terminator syntax--statement">;</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="leading-whitespace"> </span><span class="syntax--keyword syntax--control">if</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span>cardType <span class="syntax--keyword syntax--operator">==</span> <span class="syntax--constant syntax--other">CARD_NONE</span><span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span> <span class="syntax--punctuation syntax--section syntax--block syntax--begin syntax--bracket syntax--curly">{</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="leading-whitespace"> </span>Serial<span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--entity syntax--name syntax--function">println</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span><span class="syntax--string syntax--quoted syntax--double"><span class="syntax--punctuation syntax--definition syntax--string">"</span>No SD card attached<span class="syntax--punctuation syntax--definition syntax--string">"</span></span><span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span><span class="syntax--punctuation syntax--terminator syntax--statement">;</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="leading-whitespace"> </span><span class="syntax--keyword syntax--control">return</span><span class="syntax--punctuation syntax--terminator syntax--statement">;</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="leading-whitespace"> </span><span class="syntax--punctuation syntax--section syntax--block syntax--end syntax--bracket syntax--curly">}</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="leading-whitespace"> </span>Wire<span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--entity syntax--name syntax--function">begin</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span><span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span><span class="syntax--punctuation syntax--terminator syntax--statement">;</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="leading-whitespace"> </span>sensor<span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--entity syntax--name syntax--function">init</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span><span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span><span class="syntax--punctuation syntax--terminator syntax--statement">;</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="leading-whitespace"> </span>sensor<span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--entity syntax--name syntax--function">enableDefault</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span><span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span><span class="syntax--punctuation syntax--terminator syntax--statement">;</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="syntax--punctuation syntax--section syntax--block syntax--end syntax--bracket syntax--curly">}</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="syntax--support syntax--storage syntax--type">void</span> <span class="syntax--entity syntax--name syntax--function">loop</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span><span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span> <span class="syntax--punctuation syntax--section syntax--block syntax--begin syntax--bracket syntax--curly">{</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="leading-whitespace"> </span><span class="syntax--support syntax--storage syntax--type">int</span> len <span class="syntax--keyword syntax--operator">=</span> <span class="syntax--constant syntax--numeric syntax--decimal">0</span><span class="syntax--punctuation syntax--terminator syntax--statement">;</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="leading-whitespace"> </span><span class="syntax--keyword syntax--control">for</span> <span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span><span class="syntax--support syntax--storage syntax--type">int</span> i<span class="syntax--keyword syntax--operator">=</span><span class="syntax--constant syntax--numeric syntax--decimal">0</span><span class="syntax--punctuation syntax--terminator syntax--statement">;</span> i<<span class="syntax--constant syntax--numeric syntax--decimal">100</span><span class="syntax--punctuation syntax--terminator syntax--statement">;</span> i<span class="syntax--keyword syntax--operator">++</span><span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span> <span class="syntax--punctuation syntax--section syntax--block syntax--begin syntax--bracket syntax--curly">{</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="leading-whitespace"> </span>sensor<span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--entity syntax--name syntax--function">read</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span><span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span><span class="syntax--punctuation syntax--terminator syntax--statement">;</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="leading-whitespace"> </span>len <span class="syntax--keyword syntax--operator">+=</span> <span class="syntax--entity syntax--name syntax--function">sprintf</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span>outS <span class="syntax--keyword syntax--operator">+</span> len, <span class="syntax--string syntax--quoted syntax--double"><span class="syntax--punctuation syntax--definition syntax--string">"</span>%6d, %6d, %6d<span class="syntax--constant syntax--character syntax--escape">\n</span><span class="syntax--punctuation syntax--definition syntax--string">"</span></span>, sensor<span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--variable syntax--other syntax--member">a</span><span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--variable syntax--other syntax--member">x</span>, sensor<span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--variable syntax--other syntax--member">a</span><span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--variable syntax--other syntax--member">y</span>, sensor<span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--variable syntax--other syntax--member">a</span><span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--variable syntax--other syntax--member">z</span><span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span><span class="syntax--punctuation syntax--terminator syntax--statement">;</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="leading-whitespace"> </span><span class="syntax--entity syntax--name syntax--function">delay</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span><span class="syntax--constant syntax--numeric syntax--decimal">20</span><span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span><span class="syntax--punctuation syntax--terminator syntax--statement">;</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="leading-whitespace"> </span><span class="syntax--punctuation syntax--section syntax--block syntax--end syntax--bracket syntax--curly">}</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="leading-whitespace"> </span><span class="syntax--entity syntax--name syntax--function">appendFile</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span><span class="syntax--constant syntax--other">SD</span>, <span class="syntax--string syntax--quoted syntax--double"><span class="syntax--punctuation syntax--definition syntax--string">"</span>/data.csv<span class="syntax--punctuation syntax--definition syntax--string">"</span></span>, outS<span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span><span class="syntax--punctuation syntax--terminator syntax--statement">;</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="syntax--punctuation syntax--section syntax--block syntax--end syntax--bracket syntax--curly">}</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="syntax--support syntax--storage syntax--type">void</span> <span class="syntax--entity syntax--name syntax--function">appendFile</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span>fs<span class="syntax--punctuation syntax--separator syntax--method syntax--double-colon">::</span><span class="syntax--support syntax--storage syntax--type">FS</span> <span class="syntax--keyword syntax--operator">&</span>fs<span class="syntax--punctuation syntax--separator syntax--delimiter">,</span> <span class="syntax--storage syntax--modifier">const</span> <span class="syntax--support syntax--storage syntax--type">char</span> <span class="syntax--keyword syntax--operator">*</span> path<span class="syntax--punctuation syntax--separator syntax--delimiter">,</span> <span class="syntax--storage syntax--modifier">const</span> <span class="syntax--support syntax--storage syntax--type">char</span> <span class="syntax--keyword syntax--operator">*</span> message<span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span><span class="syntax--punctuation syntax--section syntax--block syntax--begin syntax--bracket syntax--curly">{</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="leading-whitespace"> </span>Serial<span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--entity syntax--name syntax--function">printf</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span><span class="syntax--string syntax--quoted syntax--double"><span class="syntax--punctuation syntax--definition syntax--string">"</span>Appending to file: %s<span class="syntax--constant syntax--character syntax--escape">\n</span><span class="syntax--punctuation syntax--definition syntax--string">"</span></span>, path<span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span><span class="syntax--punctuation syntax--terminator syntax--statement">;</span></span></div><div class="line"></div><div class="line"><span class="syntax--source syntax--cpp"><span class="leading-whitespace"> </span><span class="syntax--support syntax--storage syntax--type">File</span> file <span class="syntax--keyword syntax--operator">=</span> fs<span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--entity syntax--name syntax--function">open</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span>path, <span class="syntax--constant syntax--other">FILE_APPEND</span><span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span><span class="syntax--punctuation syntax--terminator syntax--statement">;</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="leading-whitespace"> </span><span class="syntax--keyword syntax--control">if</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span><span class="syntax--keyword syntax--operator">!</span>file<span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span> <span class="syntax--punctuation syntax--section syntax--block syntax--begin syntax--bracket syntax--curly">{</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="leading-whitespace"> </span>Serial<span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--entity syntax--name syntax--function">println</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span><span class="syntax--string syntax--quoted syntax--double"><span class="syntax--punctuation syntax--definition syntax--string">"</span>Failed to open file for appending<span class="syntax--punctuation syntax--definition syntax--string">"</span></span><span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span><span class="syntax--punctuation syntax--terminator syntax--statement">;</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="leading-whitespace"> </span><span class="syntax--keyword syntax--control">return</span><span class="syntax--punctuation syntax--terminator syntax--statement">;</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="leading-whitespace"> </span><span class="syntax--punctuation syntax--section syntax--block syntax--end syntax--bracket syntax--curly">}</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="leading-whitespace"> </span><span class="syntax--keyword syntax--control">if</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span>file<span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--entity syntax--name syntax--function">print</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span>message<span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span><span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span> <span class="syntax--punctuation syntax--section syntax--block syntax--begin syntax--bracket syntax--curly">{</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="leading-whitespace"> </span>Serial<span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--entity syntax--name syntax--function">println</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span><span class="syntax--string syntax--quoted syntax--double"><span class="syntax--punctuation syntax--definition syntax--string">"</span>Message appended<span class="syntax--punctuation syntax--definition syntax--string">"</span></span><span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span><span class="syntax--punctuation syntax--terminator syntax--statement">;</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="leading-whitespace"> </span><span class="syntax--punctuation syntax--section syntax--block syntax--end syntax--bracket syntax--curly">}</span> <span class="syntax--keyword syntax--control">else</span> <span class="syntax--punctuation syntax--section syntax--block syntax--begin syntax--bracket syntax--curly">{</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="leading-whitespace"> </span>Serial<span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--entity syntax--name syntax--function">println</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span><span class="syntax--string syntax--quoted syntax--double"><span class="syntax--punctuation syntax--definition syntax--string">"</span>Append failed<span class="syntax--punctuation syntax--definition syntax--string">"</span></span><span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span><span class="syntax--punctuation syntax--terminator syntax--statement">;</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="leading-whitespace"> </span><span class="syntax--punctuation syntax--section syntax--block syntax--end syntax--bracket syntax--curly">}</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="leading-whitespace"> </span>file<span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--entity syntax--name syntax--function">close</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span><span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span><span class="syntax--punctuation syntax--terminator syntax--statement">;</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="syntax--punctuation syntax--section syntax--block syntax--end syntax--bracket syntax--curly">}</span></span></div></pre>
<h2 id="explanation-1">Explanation</h2>
<pre class="editor-colors lang-cpp"><div class="line"><span class="syntax--source syntax--cpp"><span class="syntax--keyword syntax--control syntax--directive">#include</span> <span class="syntax--string syntax--quoted syntax--double"><span class="syntax--punctuation syntax--definition syntax--string">"</span>FS.h<span class="syntax--punctuation syntax--definition syntax--string">"</span></span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="syntax--keyword syntax--control syntax--directive">#include</span> <span class="syntax--string syntax--quoted syntax--double"><span class="syntax--punctuation syntax--definition syntax--string">"</span>SD.h<span class="syntax--punctuation syntax--definition syntax--string">"</span></span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="syntax--keyword syntax--control syntax--directive">#include</span> <span class="syntax--string syntax--quoted syntax--double"><span class="syntax--punctuation syntax--definition syntax--string">"</span>SPI.h<span class="syntax--punctuation syntax--definition syntax--string">"</span></span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="syntax--keyword syntax--control syntax--directive">#include</span> <span class="syntax--string syntax--quoted syntax--double"><span class="syntax--punctuation syntax--definition syntax--string">"</span>Wire.h<span class="syntax--punctuation syntax--definition syntax--string">"</span></span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="syntax--keyword syntax--control syntax--directive">#include</span> <span class="syntax--string syntax--quoted syntax--other"><LSM303.h></span></span></div></pre>
<p>Here we include the Wire and LSM303 libraries, just like in the previous program, but also the FS, SD and SPI libraries, as these handle the SD card communication and filesystem</p>
<pre class="editor-colors lang-cpp"><div class="line"><span class="syntax--source syntax--cpp"><span class="syntax--support syntax--storage syntax--type">LSM303</span> sensor<span class="syntax--punctuation syntax--terminator syntax--statement">;</span></span></div></pre>
<p>Create an LSM303 object named sensor to interface with the LSM303D accelerometer</p>
<pre class="editor-colors lang-cpp"><div class="line"><span class="syntax--source syntax--cpp"><span class="syntax--support syntax--storage syntax--type">char</span><span class="syntax--keyword syntax--operator">*</span> outS <span class="syntax--keyword syntax--operator">=</span> <span class="syntax--keyword syntax--operator">new</span> <span class="syntax--support syntax--storage syntax--type">char</span><span class="syntax--punctuation syntax--definition syntax--begin syntax--bracket syntax--square">[</span><span class="syntax--constant syntax--numeric syntax--decimal">300</span><span class="syntax--punctuation syntax--definition syntax--end syntax--bracket syntax--square">]</span><span class="syntax--punctuation syntax--terminator syntax--statement">;</span></span></div></pre>
<p>Create a string which will contain a buffer of measurements to be written to the SD card (note: this is already a string and not an array of integers)</p>
<pre class="editor-colors lang-cpp"><div class="line"><span class="syntax--source syntax--cpp">Serial<span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--entity syntax--name syntax--function">begin</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span><span class="syntax--constant syntax--numeric syntax--decimal">115200</span><span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span><span class="syntax--punctuation syntax--terminator syntax--statement">;</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="syntax--keyword syntax--control">if</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span><span class="syntax--keyword syntax--operator">!</span><span class="syntax--constant syntax--other">SD</span><span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--entity syntax--name syntax--function">begin</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span><span class="syntax--constant syntax--numeric syntax--decimal">5</span><span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span><span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span> <span class="syntax--punctuation syntax--section syntax--block syntax--begin syntax--bracket syntax--curly">{</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="leading-whitespace"> </span>Serial<span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--entity syntax--name syntax--function">println</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span><span class="syntax--string syntax--quoted syntax--double"><span class="syntax--punctuation syntax--definition syntax--string">"</span>Card Mount Failed<span class="syntax--punctuation syntax--definition syntax--string">"</span></span><span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span><span class="syntax--punctuation syntax--terminator syntax--statement">;</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="leading-whitespace"> </span><span class="syntax--keyword syntax--control">return</span><span class="syntax--punctuation syntax--terminator syntax--statement">;</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="syntax--punctuation syntax--section syntax--block syntax--end syntax--bracket syntax--curly">}</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="syntax--support syntax--storage syntax--type">uint8_t</span> cardType <span class="syntax--keyword syntax--operator">=</span> <span class="syntax--constant syntax--other">SD</span><span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--entity syntax--name syntax--function">cardType</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span><span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span><span class="syntax--punctuation syntax--terminator syntax--statement">;</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="syntax--keyword syntax--control">if</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span>cardType <span class="syntax--keyword syntax--operator">==</span> <span class="syntax--constant syntax--other">CARD_NONE</span><span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span> <span class="syntax--punctuation syntax--section syntax--block syntax--begin syntax--bracket syntax--curly">{</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="leading-whitespace"> </span>Serial<span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--entity syntax--name syntax--function">println</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span><span class="syntax--string syntax--quoted syntax--double"><span class="syntax--punctuation syntax--definition syntax--string">"</span>No SD card attached<span class="syntax--punctuation syntax--definition syntax--string">"</span></span><span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span><span class="syntax--punctuation syntax--terminator syntax--statement">;</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="leading-whitespace"> </span><span class="syntax--keyword syntax--control">return</span><span class="syntax--punctuation syntax--terminator syntax--statement">;</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="syntax--punctuation syntax--section syntax--block syntax--end syntax--bracket syntax--curly">}</span></span></div></pre>
<p>Set up the SD card and print any problems to the serial port</p>
<pre class="editor-colors lang-cpp"><div class="line"><span class="syntax--source syntax--cpp">Wire<span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--entity syntax--name syntax--function">begin</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span><span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span><span class="syntax--punctuation syntax--terminator syntax--statement">;</span></span></div><div class="line"><span class="syntax--source syntax--cpp">sensor<span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--entity syntax--name syntax--function">init</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span><span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span><span class="syntax--punctuation syntax--terminator syntax--statement">;</span></span></div><div class="line"><span class="syntax--source syntax--cpp">sensor<span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--entity syntax--name syntax--function">enableDefault</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span><span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span><span class="syntax--punctuation syntax--terminator syntax--statement">;</span></span></div></pre>
<p>Initialise the accelerometer</p>
<pre class="editor-colors lang-cpp"><div class="line"><span class="syntax--source syntax--cpp"><span class="syntax--support syntax--storage syntax--type">int</span> len <span class="syntax--keyword syntax--operator">=</span> <span class="syntax--constant syntax--numeric syntax--decimal">0</span><span class="syntax--punctuation syntax--terminator syntax--statement">;</span></span></div></pre>
<p>Set the "pointer" to 0 (this variable keeps track of how far we have progressed through our buffer)</p>
<pre class="editor-colors lang-cpp"><div class="line"><span class="syntax--source syntax--cpp"><span class="syntax--keyword syntax--control">for</span> <span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span><span class="syntax--support syntax--storage syntax--type">int</span> i<span class="syntax--keyword syntax--operator">=</span><span class="syntax--constant syntax--numeric syntax--decimal">0</span><span class="syntax--punctuation syntax--terminator syntax--statement">;</span> i<<span class="syntax--constant syntax--numeric syntax--decimal">100</span><span class="syntax--punctuation syntax--terminator syntax--statement">;</span> i<span class="syntax--keyword syntax--operator">++</span><span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span> <span class="syntax--punctuation syntax--section syntax--block syntax--begin syntax--bracket syntax--curly">{</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="leading-whitespace"> </span>...</span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="syntax--punctuation syntax--section syntax--block syntax--end syntax--bracket syntax--curly">}</span>```</span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="syntax--support syntax--storage syntax--type">Take</span> <span class="syntax--constant syntax--numeric syntax--decimal">100</span> readings, at <span class="syntax--constant syntax--numeric syntax--decimal">50</span> Hz sample <span class="syntax--support syntax--storage syntax--type">rate</span> this <span class="syntax--support syntax--storage syntax--type">would</span> be <span class="syntax--constant syntax--numeric syntax--decimal">2</span> seconds <span class="syntax--support syntax--storage syntax--type">of</span> data</span></div><div class="line"><span class="syntax--source syntax--cpp">```cpp</span></div><div class="line"><span class="syntax--source syntax--cpp">sensor<span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--entity syntax--name syntax--function">read</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span><span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span><span class="syntax--punctuation syntax--terminator syntax--statement">;</span></span></div></pre>
<p>Read the current acceleration</p>
<pre class="editor-colors lang-cpp"><div class="line"><span class="syntax--source syntax--cpp">len <span class="syntax--keyword syntax--operator">+=</span> <span class="syntax--entity syntax--name syntax--function">sprintf</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span>outS <span class="syntax--keyword syntax--operator">+</span> len, <span class="syntax--string syntax--quoted syntax--double"><span class="syntax--punctuation syntax--definition syntax--string">"</span>%6d, %6d, %6d<span class="syntax--constant syntax--character syntax--escape">\n</span><span class="syntax--punctuation syntax--definition syntax--string">"</span></span>, sensor<span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--variable syntax--other syntax--member">a</span><span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--variable syntax--other syntax--member">x</span>, sensor<span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--variable syntax--other syntax--member">a</span><span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--variable syntax--other syntax--member">y</span>, sensor<span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--variable syntax--other syntax--member">a</span><span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--variable syntax--other syntax--member">z</span><span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span><span class="syntax--punctuation syntax--terminator syntax--statement">;</span></span></div></pre>
<p>write our x y and z acceleration (seperated by ",") into our buffer at position len and increment len to reflect new position</p>
<pre class="editor-colors lang-cpp"><div class="line"><span class="syntax--source syntax--cpp"><span class="syntax--entity syntax--name syntax--function">delay</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span><span class="syntax--constant syntax--numeric syntax--decimal">20</span><span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span><span class="syntax--punctuation syntax--terminator syntax--statement">;</span></span></div></pre>
<p>Pause for 20 ms. Ideally this would give us a sample rate of 50 Hz, however the previous lines of code will take a while to run, so it might not be entirely accurate</p>
<pre class="editor-colors lang-cpp"><div class="line"><span class="syntax--source syntax--cpp"><span class="syntax--entity syntax--name syntax--function">appendFile</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span><span class="syntax--constant syntax--other">SD</span>, <span class="syntax--string syntax--quoted syntax--double"><span class="syntax--punctuation syntax--definition syntax--string">"</span>/data.csv<span class="syntax--punctuation syntax--definition syntax--string">"</span></span>, outS<span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span><span class="syntax--punctuation syntax--terminator syntax--statement">;</span></span></div></pre>
<p>This writes our data (outS) to data.csv on the SD card</p>
<pre class="editor-colors lang-cpp"><div class="line"><span class="syntax--source syntax--cpp"><span class="syntax--support syntax--storage syntax--type">void</span> <span class="syntax--entity syntax--name syntax--function">appendFile</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span>fs<span class="syntax--punctuation syntax--separator syntax--method syntax--double-colon">::</span><span class="syntax--support syntax--storage syntax--type">FS</span> <span class="syntax--keyword syntax--operator">&</span>fs<span class="syntax--punctuation syntax--separator syntax--delimiter">,</span> <span class="syntax--storage syntax--modifier">const</span> <span class="syntax--support syntax--storage syntax--type">char</span> <span class="syntax--keyword syntax--operator">*</span> path<span class="syntax--punctuation syntax--separator syntax--delimiter">,</span> <span class="syntax--storage syntax--modifier">const</span> <span class="syntax--support syntax--storage syntax--type">char</span> <span class="syntax--keyword syntax--operator">*</span> message<span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span><span class="syntax--punctuation syntax--section syntax--block syntax--begin syntax--bracket syntax--curly">{</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="leading-whitespace"> </span>Serial<span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--entity syntax--name syntax--function">printf</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span><span class="syntax--string syntax--quoted syntax--double"><span class="syntax--punctuation syntax--definition syntax--string">"</span>Appending to file: %s<span class="syntax--constant syntax--character syntax--escape">\n</span><span class="syntax--punctuation syntax--definition syntax--string">"</span></span>, path<span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span><span class="syntax--punctuation syntax--terminator syntax--statement">;</span></span></div><div class="line"></div><div class="line"><span class="syntax--source syntax--cpp"><span class="leading-whitespace"> </span><span class="syntax--support syntax--storage syntax--type">File</span> file <span class="syntax--keyword syntax--operator">=</span> fs<span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--entity syntax--name syntax--function">open</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span>path, <span class="syntax--constant syntax--other">FILE_APPEND</span><span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span><span class="syntax--punctuation syntax--terminator syntax--statement">;</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="leading-whitespace"> </span><span class="syntax--keyword syntax--control">if</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span><span class="syntax--keyword syntax--operator">!</span>file<span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span> <span class="syntax--punctuation syntax--section syntax--block syntax--begin syntax--bracket syntax--curly">{</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="leading-whitespace"> </span>Serial<span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--entity syntax--name syntax--function">println</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span><span class="syntax--string syntax--quoted syntax--double"><span class="syntax--punctuation syntax--definition syntax--string">"</span>Failed to open file for appending<span class="syntax--punctuation syntax--definition syntax--string">"</span></span><span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span><span class="syntax--punctuation syntax--terminator syntax--statement">;</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="leading-whitespace"> </span><span class="syntax--keyword syntax--control">return</span><span class="syntax--punctuation syntax--terminator syntax--statement">;</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="leading-whitespace"> </span><span class="syntax--punctuation syntax--section syntax--block syntax--end syntax--bracket syntax--curly">}</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="leading-whitespace"> </span><span class="syntax--keyword syntax--control">if</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span>file<span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--entity syntax--name syntax--function">print</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span>message<span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span><span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span> <span class="syntax--punctuation syntax--section syntax--block syntax--begin syntax--bracket syntax--curly">{</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="leading-whitespace"> </span>Serial<span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--entity syntax--name syntax--function">println</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span><span class="syntax--string syntax--quoted syntax--double"><span class="syntax--punctuation syntax--definition syntax--string">"</span>Message appended<span class="syntax--punctuation syntax--definition syntax--string">"</span></span><span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span><span class="syntax--punctuation syntax--terminator syntax--statement">;</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="leading-whitespace"> </span><span class="syntax--punctuation syntax--section syntax--block syntax--end syntax--bracket syntax--curly">}</span> <span class="syntax--keyword syntax--control">else</span> <span class="syntax--punctuation syntax--section syntax--block syntax--begin syntax--bracket syntax--curly">{</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="leading-whitespace"> </span>Serial<span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--entity syntax--name syntax--function">println</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span><span class="syntax--string syntax--quoted syntax--double"><span class="syntax--punctuation syntax--definition syntax--string">"</span>Append failed<span class="syntax--punctuation syntax--definition syntax--string">"</span></span><span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span><span class="syntax--punctuation syntax--terminator syntax--statement">;</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="leading-whitespace"> </span><span class="syntax--punctuation syntax--section syntax--block syntax--end syntax--bracket syntax--curly">}</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="leading-whitespace"> </span>file<span class="syntax--keyword syntax--operator syntax--member">.</span><span class="syntax--entity syntax--name syntax--function">close</span><span class="syntax--punctuation syntax--section syntax--parens syntax--begin syntax--bracket syntax--round">(</span><span class="syntax--punctuation syntax--section syntax--parens syntax--end syntax--bracket syntax--round">)</span><span class="syntax--punctuation syntax--terminator syntax--statement">;</span></span></div><div class="line"><span class="syntax--source syntax--cpp"><span class="syntax--punctuation syntax--section syntax--block syntax--end syntax--bracket syntax--curly">}</span></span></div></pre>
<p>This function takes our SD object, a path to a file and a string (char*) and writes to the card. This function was written by Rui Santos (<a href="https://randomnerdtutorials.com/esp32-microsd-card-arduino/">https://randomnerdtutorials.com/esp32-microsd-card-arduino/</a>)</p></body>
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