/members-area/personalblogs/b/blog/posts/schematic-of-the-buildSo here&#39;s a schematic of the build. I&#39;m not sure I made the schematic very accurate when it came to the relay since on the schematic I was confused as to the purpose of each connection. In real life, I have the relay powered off of the 5 ...en-USTelligent Community 12https://community.element14.com/members-area/personalblogs/b/blog/posts/schematic-of-the-buildFri, 01 Sep 2017 20:38:44 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:228406ab-492c-45f1-98ff-93b67f35f7fbbeacon_dave1<p>As drawn, the NC contact of your relay appears to short out your +5v rail from the voltage regulator.</p><p>&nbsp;</p><p>However, presumably you are still using the opto-isolated relay board.&nbsp; </p><img src="https://community.element14.com/aggbug?PostID=3506&AppID=293&AppType=Weblog&ContentType=0" width="1" height="1">https://community.element14.com/members-area/personalblogs/b/blog/posts/schematic-of-the-buildFri, 01 Sep 2017 17:45:29 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:228406ab-492c-45f1-98ff-93b67f35f7fbpettitda0<p>You should have a flyback diode across the relay coil too.&nbsp; </p><img src="https://community.element14.com/aggbug?PostID=3506&AppID=293&AppType=Weblog&ContentType=0" width="1" height="1">