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In article ,
Mike Scott 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 :-{
>
>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 :-)
I used a solid state relay to control an oven some years back - the
Pi's 3.3v output was good enough to fire the relay although it's LED
was rather dim.
The oven was only 2.2Kw though, but I used a relay rated for something
like 40 amps (that's probably chinese amps, but it never failed in the
5 or so years I used it near daily when I was running my small bakery)
For a 3Kw project (Atmega, not a Pi) I used one of the SparkFun "Beefcake"
relays.
I think it did need a 5v signal though. You'll need a driver transitor from a
Pi.
https://www.sparkfun.com/products/13815
I built that into a control system in a micro-brewery 'washing machine'
about 5 or 6 years back and its still running today.
Gordon
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