How to Power 3x 12V Relays

Projects General Guidance
1

I am currently working out the electronics side of an automated drinks dispenser. It utilises 3x 12V air pumps which I intended to power using relays. However I am very new to this and am not sure the best way to go about supplying power to 3 separate relays. Is there a convenient way to supply the power to all 3 relays (and the arduino itself if at all possible) without having 4 power sources?

To clarify, all of the 12V outputs need to be individually controllable so couldn't run from a single relay (unless there's a way I'm missing).

Apologies if this is a dumb question.

2

Please read the first topics telling how to get the best from this forum.
What more stuff than 3 pumps will need to be powered?
Airpumps for fluids?
What relays? Use relay modules.

3

Hi @jappleby
use 3 single opto isolated relay module.
Use that has 12V relay.

RV mineirin

4

I say: use the 5 volt module. Else 12 volt is needed to make the relay switch. I've got both versions and I've just been testing them.... The 12 volt relay doesn't switch powered by 5 volt. Powering with 12 volt forces the controller to sink 12 volts or supply 12 volts.

5

Why do you think you need relays.
Logic level mosfets (or mosfet modules) can directly switch the pumps.
Leo..

6

... If we are ever given the specifications for said pumps. :face_with_raised_eyebrow:

7

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