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tilman
2017-01-12 22:06:58 +01:00
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On the software side there's two major improvements: The SD card is now mounted read-only by default. This makes unplugging the AudioSphere (by accident or for reboot) unproblematic. And the Python script that operates the player now uses interrupts instead of polling for checking the input sources. This removes unnecessary overhead from the CPU and also reduces power-consumption.
On the software side there's two major improvements: The SD card is now mounted read-only by default. This makes unplugging the AudioSphere (by accident or for reboot) unproblematic. And the Python script that operates the player now uses interrupts instead of polling for checking the input sources - no more busy waiting! This removes unnecessary overhead from the CPU and also reduces power-consumption.
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<h3 id="jblpreparation">Preparing the JBL IIIp Speaker</h3>
In order to drill the holes for the screws, the JBL On Stage IIIp has to be disassembled. The procedure is described <a href="https://de.ifixit.com/Guide/JBL+On+Stage+II+Speakers+Replacement/22462">here at ifixit.com for the predecessor</a> which works basically the same way: Remove the rubber pads, then unscrew
<h3 id="electronics">Electronics</h3>
After <a href="http://www.instructables.com/id/Multiroom-Client-With-Raspberry-Pi-ZERO-and-PHAT-D/?ALLSTEPS">soldering the PHAT DAC onto the Raspberri Pi</a> the used GPIO PINs (9, 10, 11, 17, 22 and 27 together with physical PIN 1 and 9) are connected with jumper cables. (The easiest way is to <a href="https://www.youtube.com/watch?v=MSGIrtGMYRM">solder all PINs at once with a GPIO header</a>.)
<p class="gallery">
<a href="images/audiosphere-electronics.png" class="fancybox" rel="collection03"><img src="images/audiosphere-electronics.png" width="320" alt="The electronics in a single diagram with the optical sensor on the left, the LED, the infrared LED for remote controlling the speaker and the four buttons." /></a>
<a href="images/2016-12-18_19-36-44.jpg" class="fancybox" rel="collection03"><img src="images/2016-12-18_19-36-44.jpg" width="320" alt="The circuit board after soldering with all resistors and the LED for illumination. Buttons, optical sensor and infrared LED are installed directly in the case." /></a>
</p>
<h2 id="software">Software</h2>
<h3 id="system">System Installation</h3>
<h3 id="python">Python Script</h3>