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   On 10/04/2024 20:09, Gordon Henderson wrote:   
   > 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   
   >   
      
   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   
      
   --   
   “The ultimate result of shielding men from the effects of folly is to   
   fill the world with fools.”   
      
   Herbert Spencer   
      
   --- SoupGate-Win32 v1.05   
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