<div style="font-family: 'Calibri', 'sans-serif';">What's extra funny about this thread now is that the designer of that board (Terry) is on this list!<div><br></div><div>I'm going to put two more cents in and then shut up:</div><div><br></div><div> Read Terry's "Electrical Safety Page". Mounting these boards in a well grounded metal box that is never opened with mains current applied is worth considering.</div><div><br></div><div>Pete</div><div><br></div><br><div id="htc_header">----- Reply message -----<br>From: "Rodney Radford via TriEmbed" <triembed@triembed.org><br>To: "Robert Gasiorowski" <rgresume@gmail.com><br>Cc: "triembed@triembed.org" <TriEmbed@triembed.org><br>Subject: [TriEmbed] Driving 32 5v relays<br>Date: Thu, Jul 16, 2015 5:10 PM</div></div><br><div dir="ltr">Everyone is trying to help, and that is good, but please look at the specs of this board, which is what he already has:<br><br><a href="http://yourduino.com/sunshop2/index.php?l=product_detail&p=156" target="_blank" style="font-size:12.8000001907349px">http://yourduino.com/sunshop2/index.php?l=product_detail&p=156</a><br><div><br></div><div>It has both transistors and opto-isolators, ready to go... ;-)</div><div><br></div><div>It is active low, so all that needs to be done to turn on a relay is to provide a ground path for the LED to sink the couple milliamps (1k resistor in series with the LED and connected to 5v supply).</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Jul 16, 2015 at 5:04 PM, Robert Gasiorowski <span dir="ltr"><<a href="mailto:rgresume@gmail.com" target="_blank">rgresume@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">If you already have relay boards with transistor driver, then all you need is weak driver like 595.<div>If you have relays only, then I would suggest using high current version of 595, TPIC6C595 (or higher current B595 & A595)</div><div>No need for opto-isolators if you use flyback diodes.</div><div><br></div><div>Rob.</div></div><div class="HOEnZb"><div class="h5"><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Jul 16, 2015 at 4:53 PM, Rodney Radford via TriEmbed <span dir="ltr"><<a href="mailto:triembed@triembed.org" target="_blank">triembed@triembed.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Keep in mind he has already purchased the relay board that includes the opto isolation and transistor drive... so to do anything else involves additional money for a new solution.<div><br></div><div>What he has is definitely good enough... no reason to buy anything different </div></div><div class="gmail_extra"><br><div class="gmail_quote"><div><div>On Thu, Jul 16, 2015 at 4:48 PM, John Vaughters via TriEmbed <span dir="ltr"><<a href="mailto:triembed@triembed.org" target="_blank">triembed@triembed.org</a>></span> wrote:<br></div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div><div><div style="color:#000;background-color:#fff;font-family:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif;font-size:12px"><span><div dir="ltr">>I am with Rodney on the opto-isolation relay board as the best solution.<span></span></div><div dir="ltr"><br></div></span><div dir="ltr">Small change: Opto-isolated triacs or the opto-isolated relay board. Kind of a toss up, I would probably break the tie on cost or convenience of the choices.</div> <br><div>John Vaughters</div></div></div><br></div></div><span>_______________________________________________<br>
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