240 lines
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240 lines
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<h1>danjuliodesigns llc</h1>
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<h2>engineering for life</h2>
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<li><a href="http://danjuliodesigns.com/projects/projects/dmx_fixture.html" rel="self">RGB DMX Fixture</a></li>
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<li><a href="http://danjuliodesigns.com/hacks/hacks.html" rel="self">Hacks</a></li>
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<a href="http://danjuliodesigns.com/resume/resume.html" rel="self">Resume</a>
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<li><a href="http://danjuliodesigns.com/resume/resume/hp.html" rel="self">Hewlett-Packard</a></li>
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<li><a href="http://danjuliodesigns.com/resume/resume/imi.html" rel="self">Impact Monitors</a></li>
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<li><a href="http://danjuliodesigns.com/resume/resume/hrtu.html" rel="self">Heart Rate Telemetry System</a></li>
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<li><a href="http://danjuliodesigns.com/personal/personal.html" rel="self">Personal Info</a></li>
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<div id="content">
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<h2>DMX Readout</h2>
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<br>
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<p style="text-align:center;"><img class="imageStyle" alt="dmx_readout_front" src="./Hardware Tools_files/dmx_readout_front.jpg" width="396" height="297">
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<br>
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<img class="imageStyle" alt="dmx_readout_top" src="./Hardware Tools_files/dmx_readout_top.jpg" width="394" height="295">
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<br></p>
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<p style="text-align:left;"><span style="font-size:13px;">One component of my lighting system
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design utilizes DMX as a communication protocol between my
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controllers and commercial LED fixtures. The system has the
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ability to map various data fields to any DMX channel. This
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is fairly easy to test with RGB fixtures but becomes
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difficult with more complex fixtures. I found</span>
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<span style="font-size:13px;"><a href="http://blog.wingedvictorydesign.com/about/" rel="external" target="_blank">Max Pierson’s</a></span> <span style="font-size:13px;">excellent Arduino DMX</span>
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<span style="font-size:13px;"><a href="http://blog.wingedvictorydesign.com/2009/03/20/receive-dmx-512-with-an-arduino/" rel="external" target="_blank">receiver</a></span> <span style="font-size:13px;">code. I hacked on it a bit to add a
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standard parallel LCD display that can display any eight
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sequential DMX channels in real time. The display also
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shows the number of frames being transmitted per second.
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The whole thing was wired on a perf-board and thrown
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into a cheap plastic case that originally held a
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Christmas ornament (a mistake, these cases are too
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fragile).
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<br>
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<br>
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Circuit Diagrams (</span><span style="font-size:13px;"><a href="http://danjuliodesigns.com/hw_tools/assets/dmx_readout_schem1.jpg" rel="external" target="_blank">Arduino-based</a></span> <span style="font-size:13px;">and</span> <span style="font-size:13px;"><a href="http://danjuliodesigns.com/hw_tools/assets/dmx_readout_schem2.jpg" rel="external" target="_blank">Stand-alone
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ATMega168</a></span><span style="font-size:13px;">)
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and</span> <span style="font-size:13px;"><a href="http://danjuliodesigns.com/hw_tools/assets/dmx_readout_2_0.zip" rel="external" target="_blank">Arduino Code</a></span><span style="font-size:13px;">. Note that this updated version
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compiles under Arduino 0021 (here is the original</span>
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<span style="font-size:13px;"><a href="http://danjuliodesigns.com/hw_tools/assets/dmx_readout_1_0.zip" rel="external" target="_blank">version</a></span> <span style="font-size:13px;">for Arduino 0016). I had only three
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signals left over for control after connecting the
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serial interface and LCD. I implemented a three button
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solution for setting the starting address. Up and Down
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buttons increment or decrement the starting address by 1
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for each press. Holding the Fast button causes the
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channels to change rapidly while Up or Down are held.
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Holding Up and Down together resets the starting channel
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to 1.</span>
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<br>
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<br>
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<br></p>
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<h2>Power Supply Voltage Display</h2>
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<br>
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<p style="text-align:center;"><img class="imageStyle" alt="dvm_on" src="./Hardware Tools_files/page21_3.jpg" width="320" height="237"><img class="imageStyle" alt="dvm_board" src="./Hardware Tools_files/page21_4.jpg" width="320" height="240">
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<br></p>
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<p style="text-align:left;"><span style="font-size:13px;">I
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bought an inexpensive adjustable power supply based on the
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732 regulator IC from</span> <span style="font-size:13px;"><a href="http://www.canakit.com/" rel="external" target="_blank">canakit</a></span> <span style="font-size:13px;">and then designed a simple digital
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voltage readout for it using a PIC 16F373A and 2.5 volt
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reference. I scrounged around and found some 0.1%
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resistors that summed to 28.005 k-ohms to go with a
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4.000 k-ohm 0.02% resistor I had to create the input
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voltage divider (0-20 volts scaled down to 0-2.5 volts).
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The displays were bright enough that I didn't need
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common cathode drive transistors and could sink the
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current for an entire digit with on PIC IO pin. Probably
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took 3 hours in total. Obviously it would have been a
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better use of my time to have just purchased a cheap DPM
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on ebay but we don't always choose the most efficient
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route and I didn't want to wait. If you're in a bind but
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have a few parts laying around perhaps this</span>
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<span style="font-size:13px;"><a href="http://danjuliodesigns.com/hw_tools/assets/dvm_schem.jpg" rel="external" title="DVM Schematic" target="_blank">circuit</a></span> <span style="font-size:13px;">and</span> <span style="font-size:13px;"><a href="http://danjuliodesigns.com/hw_tools/assets/dvm_asm.txt" rel="external" title="DVM Code" target="_blank">program</a></span> <span style="font-size:13px;">can help you out. You can easily
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adjust the input voltage divider or code to deal with
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whatever resistors you have at your disposal. Write it
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in C for your favorite microcontroller or an Arduino and
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the coding will only take a few minutes.</span>
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<br>
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<br>
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<br></p>
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<h2>Event Counter</h2>
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<br>
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<p style="text-align:center;"><img class="imageStyle" alt="counter" src="./Hardware Tools_files/page21_5.jpg" width="320" height="261">
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<br></p>
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<p style="text-align:left;"><span style="font-size:13px;">Along the same lines as the power supply
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voltage display I also built an event counter using a PIC
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16F84A and Siemens DL2416T display. I have primarily used
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this event counter to count the number of packet failures I
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see in the digital radio that is part of the lighting
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control system. However it has proved helpful occasionally
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for other projects as well. It can count to 19999 and then
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indicate an overflow. The "1" is indicated by the LED
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turning green. An overflow is indicated by the LED turning
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from green to red. Another very quick and dirty project
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based on an immediate need. I had the display and PIC. I
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only used this alphanumeric display to display numbers 0 -
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9 so I could tie off unused data inputs and have the PIC
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only output BCD information.</span> <span style="font-size:13px;"><a href="http://danjuliodesigns.com/hw_tools/assets/counter_schem.jpg" rel="external" title="Simple Counter Schematic" target="_blank">Schematic</a></span>
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<span style="font-size:13px;">and</span> <span style="font-size:13px;"><a href="http://danjuliodesigns.com/hw_tools/assets/counter_asm.txt" rel="external" title="Simple Counter Code" target="_blank">code</a></span> <span style="font-size:13px;">if you're interested.</span></p>
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</div>
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</div>
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</div>
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<div id="footer">
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<p>© 2008-2011 Dan Julio <a href="mailto:dan@danjuliodesigns.com" id="rw_email_contact" name="rw_email_contact">Contact</a><script type="text/javascript">
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//]]>
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