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From: Chris Green <cl@isbd.net>
Newsgroups: comp.sys.raspberry-pi
Subject: Re: relay modules?
Date: Wed, 10 Apr 2024 14:16:03 +0100
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Mike Scott <usenet.16@scottsonline.org.uk.invalid> wrote:
> Hi all. Two separate projects which will need a relay of some sort to 
> run from a Pi or similar.
> 
> I'm really looking for something plug-and-go rather than build-your-own 
> (especially item 2 below)
> 
> First is a dpdt relay to switch around 12-20 V at a couple of amps. spdt 
> are easy to come by; the only dpdt ones I've found are on aliexpress, 
> but their longevity is possibly open to question :-{
> 
Try CPC (cpc.farnell.com), but you will probably need some sort of
'driver' between the Pi digital output and the relay coil.
Alternatively, as suggested here, a solid state switch or even an opto
isolator.


> Second is something to switch mains safely - a full 13A to run a 3kW 
> heater. I've drawn a blank: best I can think of is to butcher one of 
> those wireless mains switch modules, which would at least provide a good 
> isolation gap :-)
> 
Again CPC will probably have something, but again you'll need
something between the Pi and the 'whatever'.

Are there not ready made relay modules for the Pi?

-- 
Chris Green
·