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JD-Vcc jumper relay

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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

enter image description here

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  • 2
    Try connecting GND to the INx pins, the board might be wirded up active low. – Turbo J Jun 13 at 9:12
  • haha… i am such a beginner XD. Please post it as an answer. Thank you! – Carlos Garcia Jun 13 at 9:15
  • 1
    Data sheet link to the part please. – Andy aka Jun 13 at 9:47
  • Thanks Andy, @TurboJ answered my question. The board requires GND in the INs, and not VCC – Carlos Garcia Jun 13 at 9:49
  • No, this isn’t a back-street forum where nobody cares much – you need to make sure that your question is answerable and, not supplying the data sheet means you question is lacking information. This is a Q and A site and good questions are just as important as good answers. Guessed answers that prove to be right are great but there’s still a responsibility on you to fix your question. When you have fixed it I’ll remove the downvote and close vote. Let me know when you do it. You can of course answer your own question but add the data sheet link. – Andy aka Jun 13 at 12:22
  • @Andy aka, yes, I agree that the question needs to be fixed. Actually the OP’s relay with the JD-Vcc jumper is a bit tricky to handle. He might like to read my posts for a schematic and wiring for 3V3 Rpi and 3V3 Arduino: (1) “Forbes Low Level Trigger Relay Module with JD-Vcc jumper Basics – rpi.org.forum 2018jul14”: raspberrypi.org/forums/…, (2) “Forbes Low Level Trigger Relay Module with JD-Vcc jumper Wiring – rpi.org.forum 2018jul14”: raspberrypi.org/forums/…. Cheers. – tlfong01 13 mins ago    

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