1

I am a beginner to relays and Raspberry Pi so please pardon me if my question sounds naive. I am trying to control 4 DC motors using relays and raspberry pi. I have decided to use an external supply for the relay. My doubt is how to connect the external power supply with the relay. I know that connecting the JD-VCC and GND to the external power supply would allow to me power the relay separately but I have also seen videos where the external power supply is directly connected NO pin of each of the relay. Image shown for reference: Power source directly connected to relay

Sorry for the poor image quality but the youtube video showing the connection is shown here. I wanted if there is a difference between connection as shown in the image and connecting the supply to JD-VCC and GND. Also which is the best way to do it. Thanks in advance!!

Improve this question
3
  • Hi @Prashant, your question about JD-VCC is a bit complicated. You might like to read the following to get started: (1) Appendix C of my answer to the question: ( raspberrypi.stackexchange.com/questions/99988/… ), (2) The paragraphs on using the Forbes recommended relay of my answer to the following question: ( raspberrypi.stackexchange.com/questions/95862/… ) / continue, ...
    – tlfong01
    Commented Jul 18, 2019 at 5:09
  • Now let us look at the Rpi JD-Vcc connection schematic, as shown in my second answer referred above: ( imgur.com/gallery/DVohaVG ) You need to read the schematic very carefully for at least 5 minutes, before I move on, ... /to continue, ...
    – tlfong01
    Commented Jul 18, 2019 at 5:20
  • In the above schematic, JD-Vcc jumper is removed, and (1) Opto coupler is powered by 3V3, (2) Songle relay switch is powered by 5V. Now suppose we have a similar low trigger relay, but without JD-Vcc jumper, Or we can consider that even if we have JD-Vcc jumper, this time we insert the jumper, so that both optocoupler and relay switch are connected by 5V, as show in the following picture. (imgur.com/gallery/GwBdP5Y ) /to continue, ...
    – tlfong01
    Commented Jul 18, 2019 at 6:12

0

Reset to default

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Browse other questions tagged or ask your own question.