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<h1 style="border-bottom: 2px solid;">
virtual sqrls hardware</h1>
<i><a href="http://bnewbold.net">bnewbold</a>, <a href="http://git.bnewbold.net/?p=pysqrls.git;a=summary">git repository</a></i><br />
<h2>Basic Design</h2>
Arduino microcontrollers output audio via PWM method (see links). Signal is
amplified by audio amp then output to speaker over variable length cables. 4
potentiometers per board allow adjustment of volume, timing, and two
software adjustments. There are two amps/speakers for each arduino and 5
arduinos total. Each board/package is powered by a 5v wall wart.
<h2>Notes</h2>
<p />
Arduinos and protoboards were chosen in the interest of time and reusability;
the cost will be about $37 each for those units (could drive at least 4
speakers each if they had to?); chosing cheaper components like PICs and
plain grid boards could bring the cost down to $10-15 but would require a lot
of design, assembly, debuging, and would not be as easily reused afterwards.
<p />
The number of power supplies could be reduced if we ran power wires between
the units.
<p />
The amount of "power wire" will depend on the physical situation, but this
should be super cheap and we could get more at a hardware store last minute.
<p />
This all assumes tools and consumables like solder are availble (I have plenty).
<h2>Parts list</h2>
<p />
N is the number of distinct microcontoller "units" (5?); M is the
number of speakers with distinct outputs (5?). I say +1 on the cheap stuff in
case something breaks or gets lost.
<table>
<tr /><th>How many</th><th>What</th><th>Specific Part</th>
<th>Cost Each (rounded)</th>
<th>From where</th>
<tr style="color:grey;" /><td />5
<td />Motion Sensors
<td />Parallax PIR Sensor Module<br />#555-28027
<td />
<td />Mouser <br />(already purchased)</i>
<tr /><td />5
<td />Arduino Pro Board
<td />328 5v/16MHz DEV-08943 <br />(sparkfun version)
<td />$20
<td />Sparkfun (<a href="http://www.sparkfun.com/commerce/product_info.php?products_id=9219">link</a>)
<tr /><td />5
<td />Arduino Protoboard
<td />DEV-07914 <br />(sparkfun version)
<td />$17
<td />Sparkfun (<a href="http://www.sparkfun.com/commerce/product_info.php?products_id=7914">link</a>)
<tr /><td />5
<td />Straight Pin Headers, 40x1
<td />PRT-00116<br />(sparkfun version)
<td />$2.50
<td />Sparkfun (<a href="http://www.sparkfun.com/commerce/product_info.php?products_id=116">link</a>)
<tr /><td />1
<td />FTDI-USB Breakout (Programming)
<td />DEV-09115
<td />$14
<td />Sparkfun (<a href="http://www.sparkfun.com/commerce/product_info.php?products_id=9115">link</a>)
<tr /><td />5
<td />Wall Power supply (AC to 5v DC)
<td />EPS050100-P5RP
<td />$7.25
<td />Digikey(<a href="http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=T1038-P5RP-ND">link</a>)
<tr /><td />??ft
<td />Power wire (high gauge)
<td />
<td />
<td />Radioshack?
<tr /><td />10
<td />Speaker
<td />4ohm 3watt<br />COM-09149 (sparkfun)
<td />$2.50
<td />Sparkfun (<a href="http://www.sparkfun.com/commerce/product_info.php?products_id=9149">link</a>)
<tr /><td />11
<td />Audio Amp (5v)
<td />5w stereo 12pin<br />Panasonic AN17822A
<td />$2.25
<td />Digikey (<a href="http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=AN17822A-ND">link</a>)
<tr /><td />21
<td />Adjustment Potentiometers
<td />10k Ohm through-hole mount<br />EVN-D8AA03B14
<td />$0.40
<td />Digikey (<a href="http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=D4AA14-ND">link</a>)
<tr /><td />3
<td />Rolls of stranded wire
<td />25ft each of Black, Red, White, 22awg
<td />$2.50
<td />Sparkfun (<a href="http://www.sparkfun.com/commerce/product_info.php?products_id=8867">link</a>)
</table>
<p /><b>Total cost estimate: $300</b>
<h2>Useful Links</h2>
<ul>
<li />http://www.arduino.cc/en/Main/ArduinoBoardPro
<li />http://www.sparkfun.com/commerce/product_info.php?products_id=9219
<li />http://www.uchobby.com/index.php/2007/11/11/arduino-sound-part-1/
<li />http://www.k9spud.com/traxmod/pwmdac.php
<li />http://www.arduino.cc/playground/Code/PCMAudio
</ul>
<h2>Helpful Emails</h2>
<blockquoteha>haha there are none!</blockquote>
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