The OP has a 4 channel relay module similar to one shown below.
Thank you very much for pointing me to this one, that seems to be the right one: My module is generic, and I couldn't find the official schematics. I tested with the multimeter and all the pins I connected are getting power, so either I am missing something (very probable) or I both boards are brokenĪnother thing i noticed is that if i apply 5v and GND, then all IN seems to have around 3v I also tried 3v instead of 5, and connecting to another Power supply the JD-VCC. The module seems to have some LEDs to indicate when the relay should be on, they do not light. I was expecting the first relay to switch, but nothing happened.
My first try was using a breadboard 5v power supply, connecting VCC and In1 to 5V and GND to GND. I got two 4-relay-modules and I am probably doing something wrong because none of them seems to work: Check the full answer to understand why :)
A quick benefit of JD-VCC, is that allows you to control the relays that are 5V with 3.3V GPIOs.
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