From: dave@davehigton.me.uk   
      
   In message    
             Mike Scott  wrote:   
      
   > OK, I get it. I'm after something that'll retain the same setting for   
   > extended periods, hence the desire for a latching relay to keep power   
   > dissipation down. Indeed, it does look as though what I've been looking  at   
   > is a normal relay plus a flip-flop - not what I want, and I think  you've   
   > saved me from a bad mistake.   
   >   
   > Not wanting to mess with relay driver circuitry, I've found something   
   > that's definitely latching at PiHut (I hope!!). Pricey, but complete   
   > modules don't seem available otherwise.   
   >   
   > Thanks to all for commenting.   
      
   Look at the Hongfa HFD2 data sheet.  The range includes single side   
   stable (i.e. an "ordinary" relay), 1 coil latching, and 2 coils   
   laching, and shows how to connect and how to energise to get latching   
   relays of either type into the state you want.   
      
   The latching relays are the real thing; they retain state indefinitely,   
   without power, after being set to either state.   
      
   David   
      
   --- SoupGate-DOS v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)