The GPIO can't control my relay switch

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Andy, RPi GPIO’s are 3.3 volt out. Do your relay’s look like the ones in this drawing? Specificly, are the relays 5 volt, have SRD-05VDC-SL-C on the tops? Do you have 5 volts going to the VCC on the relay board like in this diagram? [image] Next the GPIO needs to be hooked to the relay you want to control, in the below case it is GPIO13 to control relay 1 so it is hooked to IN1. And a ground needs to be hooked up. It should work as shown here, when the GPIO is pulled low the relay shoud c…

I think adding a resistor fixed the issue. It has to do with the Relay that was bought, where it always output a certain amount of voltage or something. I’ve not been able to reproduce the issue with the relays that I have, unfortunately.

-B