/products/arduino/b/blog/posts/make-arduino-relay-breakout-boards-3-3v-readyWe all have these 5V Arduino relay breakout boards. They work on 5V, and expect a 5V control signal from your controller. They work very well in that 5V / 5V setup. But these days, most microcontrollers have 3.3V for a logic high, not 5V. And ...en-USTelligent Community 12https://community.element14.com/products/arduino/b/blog/posts/make-arduino-relay-breakout-boards-3-3v-readySun, 30 Oct 2022 13:23:58 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:29657908-cda0-4008-ae09-8f2f94d7647dJan Cumps2<p>Simulation:</p> <p></p> <p><img height="278" src="/resized-image/__size/2004x556/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-29657908-cda0-4008-ae09-8f2f94d7647d/pastedimage1667136180119v4.png" width="1002" alt=" " /></p> <p></p> <p><img src="/resized-image/__size/1280x720/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-29657908-cda0-4008-ae09-8f2f94d7647d/pastedimage1667136236094v5.png" alt=" " /></p><img src="https://community.element14.com/aggbug?PostID=24685&AppID=145&AppType=Weblog&ContentType=0" width="1" height="1">https://community.element14.com/products/arduino/b/blog/posts/make-arduino-relay-breakout-boards-3-3v-readySun, 30 Oct 2022 08:57:21 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:29657908-cda0-4008-ae09-8f2f94d7647djavagoza1<p>I may be talking nonsense, but couldn&#39;t you short the bottom led? The one that is in series with the other 1K resistor. The led has a voltage drop of about 2 V.</p><img src="https://community.element14.com/aggbug?PostID=24685&AppID=145&AppType=Weblog&ContentType=0" width="1" height="1">https://community.element14.com/products/arduino/b/blog/posts/make-arduino-relay-breakout-boards-3-3v-readySat, 29 Oct 2022 17:48:14 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:29657908-cda0-4008-ae09-8f2f94d7647dDAB0<p>Nice update Jan.</p><img src="https://community.element14.com/aggbug?PostID=24685&AppID=145&AppType=Weblog&ContentType=0" width="1" height="1">