Relay module is not working with arduino

Using Arduino General Electronics
25

@LarryD

Hello Larry, Recently I have seen your post in one of the topic and I need the similar solution but for 12v relay module. I tried few things but not working as expected.

Here is the image I got from one of your post... and I tried the same way but not working.

image
image623×584 96.4 KB

Am I connected properly or anything missing?

I need to use the same like above but for 12v relay module. Please help me on this.

One more thing I didn't understand why we need to connect 12v DC to the pin A5 through resistors. Is it really required to drive the relay?

26

If you have it connected as in post #8 and #16 then you don't need any circuit to drive the relay.

27

Hi, @chandu-mca06

Can you please post some pictures of your project?
So we can see your component layout.

Do you have a DMM? (Digital MultiMeter)

Thanks.. Tom.. :grinning: :+1: :coffee: :australia:

28

@LarryD Hello Larry, Can you please help me on this?

29

Which Arduino are you using? Is it still working (will it run the blink program)?

30

On the pictures in post # 8, I don't see any terminals or jumper block. Are the opto and transistor in the schematic external to the relay?

31

I am using Arduino nano. Yes blink sketch is working fine.

32

I connected the relay as same as in the diagram at post#25. All connections are same except A5 pin. I didn't use A5 in my project but rest of the connections are same.

33

Let’s do a reset.

  • As requested, do you have a Digital Multi Meter ?
  • Please give us a link to the relay module you have.
  • We need to see the actual wiring showing good images of all connections.
  • Measure the 5 and 12 voltages, what are they.

Let's start with this schematic:

2024-02-26_09-18-58
2024-02-26_09-18-581627×712 137 KB

34

So, you have a barefoot relay, not the relay module you inferred.
I'm done, good luck.

35

This is all you need:

image
image757×410 6.12 KB

36

Yes it is working now as expected. i missed to connect both grounds :roll_eyes:.

Thank you @LarryD :slightly_smiling_face:

1 Like
37

This circuit also working great. Thanks for the quick response. :+1::+1: :slightly_smiling_face::slightly_smiling_face:

38

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