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On 10/04/2024 20:09, Gordon Henderson wrote:
> In article
1@dont-email.me>,
> 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 :-{
>>
>> 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
>
Good find - the relay is available separately at a sane price.
I might try and source some
https://www.aliexpress.com/item/4001135871051.html
Looking to make up some boards with mains relays on and PI Pico Ws and a
mains PSU to go into the backbox of a UK mains socket to act as smart
sockets...
> I built that into a control system in a micro-brewery `washing machine`
> about 5 or 6 years back and its still running today.
>
That says a lot more than any ali-express recommendation.
> Gordon
--
тАЬThe ultimate result of shielding men from the effects of folly is to
fill the world with fools.тАЭ
Herbert Spencer
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