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    <div class="moz-cite-prefix">If you search the internet for info on
      your component (one of the numbers silkscreened on top) you'll
      find a datasheet pdf. Those often have example circuits with
      proper resistor values. 33ohm would be on the low side for this
      kind of part, I wouldn't go lower than 100ohm for fear of burning
      it out. That's the other thing, opto-isolators are very easy to
      burn out. All you may need to do is start over with a new one. I
      always buy a couple extra for this reason. <br>
      --D<br>
      <br>
      On 9/23/13 11:45 PM, Phil Spitler wrote:<br>
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      With some help from Mitch tonight I dug a little deeper into the
      issue.
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      <div>Basically the OptoIsolator (opto-relay) seems to be working,
        we measured resistance across the output pins and when we
        powered it up the resistance went to ~26ohms.</div>
      <div><br>
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      <div>So, I got a 27ohm resistor and used that to short out my
        flash unit and it fired but still when I connect the flash unit
        across the output of the optoIsolator it doesn't fire.</div>
      <div><br>
      </div>
      <div>Is anybody up for giving me hand at Noisebridge to
        troubleshoot this? I would love to solve the mystery and get tis
        part of my project sorted.</div>
      <div><br>
      </div>
      <div>Much appreciated.</div>
      <div><br>
      </div>
      <div>Phil</div>
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                                        <div><b>Phil Spitler</b>  | 
                                          Creative Technologist   |  <b>Bonfire
                                            Labs</b>  |  t :
                                          415.394.8200  m : 415.571.3139<br>
                                          <br>
                                          <a moz-do-not-send="true"
                                            href="http://bonfirelabs.com/">Website</a> | <a
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                                            href="http://www.facebook.com/bonfirelabs">Facebook</a> | <a
                                            moz-do-not-send="true"
                                            href="http://www.linkedin.com/company/235257?trk=tyah">LinkedIn</a></div>
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          <div>On Sep 22, 2013, at 9:46 PM, Davidfine wrote:</div>
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              <div class="moz-cite-prefix">With an opto isolator you're
                really just powering a small LED inside the packaging.
                Something between 1k and 150 ohm will probably not burn
                it out too quickly - use the highest resistance that
                triggers it solidly. And try it without the arduino
                first (but with a resistor).<br>
                --D<br>
                <br>
                On 9/22/13 9:22 PM, Phil Spitler wrote:<br>
              </div>
              <blockquote
                cite="mid:062BEAE1-2564-4107-A570-66DFE8504C3D@bonfirelabs.com"
                type="cite"> Hey list people, I have an electronics
                question that I wonder if somebody could help me with.
                <div><br>
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                <div>Basically I'm trying to build a high speed
                  photography rig based on this.</div>
                <div><br>
                </div>
                <div><a moz-do-not-send="true"
                    href="http://mattrichardson.com/blog/arduino-flash-trigger-parts-list/">http://mattrichardson.com/blog/arduino-flash-trigger-parts-list/</a></div>
                <div><br>
                </div>
                <div>I have fallen at the first hurdle which is to get
                  the opto-issolator to work.</div>
                <div><br>
                </div>
                <div>I have a feeling it is due to the value of the
                  resistor I'm using on the input.</div>
                <div><br>
                </div>
                <div>I have followed his instructions but it seems like
                  the resistor value of  4.7k might be too high.</div>
                <div><br>
                </div>
                <div>I found the data sheet for the opto-issolator here <a
                    moz-do-not-send="true"
href="http://pewa.panasonic.com/assets/pcsd/catalog/aqw-dip-2-form-a-catalog.pdf">http://pewa.panasonic.com/assets/pcsd/catalog/aqw-dip-2-form-a-catalog.pdf</a> </div>
                <div><br>
                </div>
                <div>And more info here. <a moz-do-not-send="true"
href="http://www.digchip.com/datasheets/parts/datasheet/724/AQW280EH.php">http://www.digchip.com/datasheets/parts/datasheet/724/AQW280EH.php</a></div>
                <div><br>
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                <div>I used an online resistor calculator  <a
                    moz-do-not-send="true"
                    href="http://led.linear1.org/1led.wiz">http://led.linear1.org/1led.wiz</a> and

                  put in the numbers that I found in the data sheet (I
                  think) and it gave me a resistor value of 33 ohms.</div>
                <div><br>
                </div>
                <div>When I use the 4.7k resistor the opto-isolator
                  doesn't do anything when the arduino pin goes high but
                  I don;t want to use a much lower value in case I fuck
                  the chip.</div>
                <div><br>
                </div>
                <div>Any ideas?</div>
                <div><br>
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                <div>Cheers.</div>
                <div><br>
                </div>
                <div>Phil</div>
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                                        <div><b>Phil Spitler</b>  | 
                                          Creative Technologist   |  <b>Bonfire
                                            Labs</b>  |  t :
                                          415.394.8200  m : 415.571.3139<br>
                                          <br>
                                          <a moz-do-not-send="true"
                                            href="http://bonfirelabs.com/">Website</a> | <a
                                            moz-do-not-send="true"
                                            href="http://www.facebook.com/bonfirelabs">Facebook</a> | <a
                                            moz-do-not-send="true"
                                            href="http://www.linkedin.com/company/235257?trk=tyah">LinkedIn</a></div>
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