5V or 12V relay board for Arduino?

Other Hardware Motors, Mechanics, Power and CNC
1

I bought this relay board, but I think I screwed up because I ordered the 12V version thinking I was going to control 12 V (in a car).
Now I think that maybe I should have got the 5V version so I could power the board from the Arduino 5V power?

Do I understand it correctly if thinking I have to supply my board with 12V to the VCC on the relay board?

2

Link to the relay you bought please.

3

Hi Session,
You should never power anything directly from the Arduino. So use a 12v power supply and the 12V relay will be fine. Yes the same supply can power the arduino via the Vin pin or the power socket, make sure both board grounds are connected.

Regards

Mel.

4

Carefully study the schematic for the relay board purchased. Some boards are optically isolated and some are not. The voltage printed on the relay itself will probably be the voltage designed to operate the coil in the relay.

5

Is there any data sheet or sth similar? I also agree not to power from arduino, in best case you wont get a good performance, besides overloading the board. Try to power arduino from an outsource like battery series, also you can supply power from common 12V/5V ;(which you prefer) power supply that you will feed motors.

Regards.

6

Sorry I forgot the link. 16-Channel 5V Relay Optocoupler Protection Module Board - Free shipping - DealExtreme

Unfortunatly it seems there is no schematic supplied...

7

Hi.

Sorry to post-bombing here but I have problem with my recently bought relay board and found this post with similar problem.

I bought this product to control 12V lights but is it possible or do I need the 5V version?

I also tried to connect it with my arduino but my arduino can't turn it on / off.
It just stays on.
The arduino itself is connected to 12V powersupply by some instructions what I found from net.

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