Switching 12V pumps and devices

1

Hi all,

I could not get much info from a search on switching the 12V Brewpi pump using Brewpi.

I have Ac running into my control panel via a power board (literally a 5 way power board in by panel). Should I add a 12V supply to this, put 12V across a DC relay, and switch it with the 5V from Brewpi? Is it this simple?

If anyone has any other ideas, or queries maybe add them here as a future resource?

2

One option you have is to switcht he power supply before the pump with an AC relay.

To switch DC, you could:

I used this circuit:

3

There’s a useful article on controlling Power, its for Arduino but it can easily be applied for use with the Brewpi. It covers use of relays and MOSFET.
https://arduino-info.wikispaces.com/ArduinoPower

4

I’m not an electrical engineer, but I can gather components and solder. If you have a pic of a completed circuit so I can see which of the 3 MOSFET pins are connected to what, I can solder this up. Otherwise I’m thinking about using a DC-DC SSR: https://www.amazon.com/uxcell%C2%AE-Soild-SSR-25-3-32VDC-5-200VDC/dp/B019132CY8/ref=sr_1_1?ie=UTF8&qid=1468328215&sr=8-1&keywords=DC+SSR

5

I think that would work fine.

Or alternatively, something like this:

http://nl.aliexpress.com/item/4-Channel-4-Route-MOSFET-Button-IRF540-V2-0-MOSFET-Switch-Module/32445180883.html

This board has an optocoupler too, between spark and mosfet.

6

Can I use this same MOSFET and resistor combo to switch a 5V DC circuit, instead of the 12V circuit you have drawn? I don’t know a lot about MOSFETs so I thought I’d go with your tried and tested combo as a shortcut.