I got two 4-relay-modules and I am probably doing something wrong because none of them seems to work:
My first try was using a breadboard 5v power supply, connecting VCC and In1 to 5V and GND to GND. I was expecting the first relay to switch, but nothing happened. I tried with all In pins but nothing
The module seems to have some LEDs to indicate when the relay should be on, they do not light.
I also tried 3v instead of 5, and connecting to another Power supply the JD-VCC. Nothing works 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 broken
Another thing i noticed is that if i apply 5v and GND, then all IN seems to have around 3v
The relay model: JQC3F-5VDC-C