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maoning · Apr 16, 2016 · 7d82e68 · 7d82e68
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diff --git a/.gitignore b/.gitignore
@@ -1,2 +1,3 @@
 .DS_Store
+.sass-cache/
 
diff --git a/_posts/2016-04-15-FFT-with-Arduino.md b/_posts/2016-04-15-FFT-with-Arduino.md
@@ -0,0 +1,27 @@
+---
+layout: post
+title: Real-time Signal Processing with Arduino
+excerpt: "How to use Arduino for real-time audio signal processing."
+categories: Arduino
+comments: true
+---
+
+The objective of this exercise is to reproduce "Sitting Wave" using an Arduino. The audio signal from a microphone connected to the Arduino is modulated with a signal with a known frequency to bring the audio signal to base band. A low pass filter is applied to the result. Then the audio signal is output to SWIM stick to illustrate the phenomenon of the Sitting Wave with the use of a long exposure photograph.
+
+### Background Knowledge
+Nyquist Theorem:
+
+    We can only accurately measure frequencies equal or less than half of the sampling rate.
+
+
+
+
+<!-- Code example goes here -->
+
+
+<!-- Questions
+1. Inside the same app, could multiple instance of tasks exist?
+-->
+
+[You can find the awesome Adafruit tutorial here.]( https://learn.adafruit.com/fft-fun-with-fourier-transforms?view=all)
+[Documentation on Wave Shield from Adafruit.](https://learn.adafruit.com/adafruit-wave-shield-audio-shield-for-arduino?view=all)
diff --git a/_sass/pages/_layout.scss b/_sass/pages/_layout.scss
@@ -3,7 +3,7 @@
   // background-color: $background-color;
   // background: url(../../img/bg.jpg) no-repeat center fixed;
   background-image: $background-image;
-  background-size: 160%;
+  background-size: 250%;
   background-repeat: no-repeat;
   position: fixed;
   text-align: center;;

diff --git a/_site/archive/index.html b/_site/archive/index.html
@@ -35,7 +35,7 @@
 
   <img src="/img/avatar.jpg" alt="" class="avatar">
 
-  <a href="/" class="author_name">Neomorning</a>
+  <a href="/" class="author_name">neomorning</a>
   <span class="author_job">Developer</span>
   <span class="author_bio mbm">Code monkey, fantasy/scifi/coffee addict, soldering fume maker, whah? A blog for like-minded people, and a notepad for myself. Have fun...</span>
   <nav class="nav">
@@ -104,6 +104,14 @@ <h4 class="archive-year">2016</h4>
 
     <ul>
 
+    <li>
+      <span>Apr 15</span>&nbsp;~&nbsp;<i class="fa fa-angle-right"></i>&nbsp;<a href="/articles/2016-04/FFT-with-Arduino">Real-time Signal Processing with Arduino</a></li>
+
+
+
+
+
+
     <li>
       <span>Apr 15</span>&nbsp;~&nbsp;<i class="fa fa-angle-right"></i>&nbsp;<a href="/articles/2016-04/Android-task-and-activity-management">Android Task and Activity Management</a></li>
 
@@ -122,7 +130,7 @@ <h4 class="archive-year">2016</h4>
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diff --git a/_site/articles/2016-04/Android-task-and-activity-management.html b/_site/articles/2016-04/Android-task-and-activity-management.html
@@ -34,7 +34,7 @@
 
   <img src="/img/avatar.jpg" alt="" class="avatar">
 
-  <a href="/" class="author_name">Neomorning</a>
+  <a href="/" class="author_name">neomorning</a>
   <span class="author_job">Developer</span>
   <span class="author_bio mbm">Code monkey, fantasy/scifi/coffee addict, soldering fume maker, whah? A blog for like-minded people, and a notepad for myself. Have fun...</span>
   <nav class="nav">
@@ -208,7 +208,7 @@ <h6>Share on: </h6>
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diff --git a/_site/articles/2016-04/FFT-with-Arduino.html b/_site/articles/2016-04/FFT-with-Arduino.html
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+  <meta name="description" content="How to use Arduino for real-time audio signal processing.">
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+    <h1 title="Real-time Signal Processing with Arduino">Real-time Signal Processing with Arduino</h1>
+    <span class="post-meta">
+      <span class="post-date">
+        15 APR 2016
+      </span>
+      •
+      <span class="read-time" title="Estimated read time">
+
+
+    1 min read
+
+</span>
+
+    </span>
+
+  </header>
+
+  <article class="post-content">
+    <p>The objective of this exercise is to reproduce “Sitting Wave” using an Arduino. The audio signal from a microphone connected to the Arduino is modulated with a signal with a known frequency to bring the audio signal to base band. A low pass filter is applied to the result. Then the audio signal is output to SWIM stick to illustrate the phenomenon of the Sitting Wave with the use of a long exposure photograph.</p>
+
+<h3 id="background-knowledge">Background Knowledge</h3>
+<p>Nyquist Theorem:</p>
+
+<pre><code>We can only accurately measure frequencies equal or less than half of the sampling rate.
+</code></pre>
+
+<!-- Code example goes here -->
+
+<!-- Questions
+1. Inside the same app, could multiple instance of tasks exist?
+-->
+
+<p><a href="https://learn.adafruit.com/fft-fun-with-fourier-transforms?view=all">You can find the awesome Adafruit tutorial here.</a>
+<a href="https://learn.adafruit.com/adafruit-wave-shield-audio-shield-for-arduino?view=all">Documentation on Wave Shield from Adafruit.</a></p>
+
+  </article>
+</div>
+
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+  <h6>Share on: </h6>
+  <ul>
+    <li>
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diff --git a/_site/categories/index.html b/_site/categories/index.html
@@ -35,7 +35,7 @@
 
   <img src="/img/avatar.jpg" alt="" class="avatar">
 
-  <a href="/" class="author_name">Neomorning</a>
+  <a href="/" class="author_name">neomorning</a>
   <span class="author_job">Developer</span>
   <span class="author_bio mbm">Code monkey, fantasy/scifi/coffee addict, soldering fume maker, whah? A blog for like-minded people, and a notepad for myself. Have fun...</span>
   <nav class="nav">
@@ -106,6 +106,16 @@ <h5 class="tag-group-title" id="Android">Android</h5>
 
   </div>
 
+  <div class="tag-group">
+
+    <h5 class="tag-group-title" id="Arduino">Arduino</h5>
+
+    <article class="tag-item">
+      <a class="tag-item-title" href="/articles/2016-04/FFT-with-Arduino">Real-time Signal Processing with Arduino</a>
+    </article>
+
+  </div>
+
 </div>
 
     </article>
@@ -117,7 +127,7 @@ <h5 class="tag-group-title" id="Android">Android</h5>
   <!-- 
 
         <footer>
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+  &copy; 2016 neomorning. Powered by <a href="http://jekyllrb.com/">Jekyll</a>, <a href="http://github.com/renyuanz/leonids/">leonids theme</a> made with <i class="fa fa-heart heart-icon"></i>
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diff --git a/_site/css/main.css b/_site/css/main.css
@@ -1436,7 +1436,7 @@ pre code {
 /* LAYOUT CSS */
 .cover {
   background-image: url(../../img/bg.jpg);
-  background-size: 160%;
+  background-size: 250%;
   background-repeat: no-repeat;
   position: fixed;
   text-align: center;

diff --git a/_site/feed.xml b/_site/feed.xml
@@ -6,10 +6,38 @@
 </description>
     <link>/</link>
     <atom:link href="/feed.xml" rel="self" type="application/rss+xml"/>
-    <pubDate>Fri, 15 Apr 2016 18:04:10 +0000</pubDate>
-    <lastBuildDate>Fri, 15 Apr 2016 18:04:10 +0000</lastBuildDate>
+    <pubDate>Sat, 16 Apr 2016 00:52:28 +0000</pubDate>
+    <lastBuildDate>Sat, 16 Apr 2016 00:52:28 +0000</lastBuildDate>
     <generator>Jekyll v3.0.3</generator>
 
+      <item>
+        <title>Real-time Signal Processing with Arduino</title>
+        <description>&lt;p&gt;The objective of this exercise is to reproduce “Sitting Wave” using an Arduino. The audio signal from a microphone connected to the Arduino is modulated with a signal with a known frequency to bring the audio signal to base band. A low pass filter is applied to the result. Then the audio signal is output to SWIM stick to illustrate the phenomenon of the Sitting Wave with the use of a long exposure photograph.&lt;/p&gt;
+
+&lt;h3 id=&quot;background-knowledge&quot;&gt;Background Knowledge&lt;/h3&gt;
+&lt;p&gt;Nyquist Theorem:&lt;/p&gt;
+
+&lt;pre&gt;&lt;code&gt;We can only accurately measure frequencies equal or less than half of the sampling rate.
+&lt;/code&gt;&lt;/pre&gt;
+
+&lt;!-- Code example goes here --&gt;
+
+&lt;!-- Questions
+1. Inside the same app, could multiple instance of tasks exist?
+--&gt;
+
+&lt;p&gt;&lt;a href=&quot;https://learn.adafruit.com/fft-fun-with-fourier-transforms?view=all&quot;&gt;You can find the awesome Adafruit tutorial here.&lt;/a&gt;
+&lt;a href=&quot;https://learn.adafruit.com/adafruit-wave-shield-audio-shield-for-arduino?view=all&quot;&gt;Documentation on Wave Shield from Adafruit.&lt;/a&gt;&lt;/p&gt;
+</description>
+        <pubDate>Fri, 15 Apr 2016 00:00:00 +0000</pubDate>
+        <link>/articles/2016-04/FFT-with-Arduino</link>
+        <guid isPermaLink="true">/articles/2016-04/FFT-with-Arduino</guid>
+
+
+        <category>Arduino</category>
+
+      </item>
+
       <item>
         <title>Android Task and Activity Management</title>
         <description>&lt;p&gt;Definition of tasks and activities&lt;/p&gt;