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   REPLYADDR none@nowhere.whereo   
   REPLYTO 3:770/3.0 UUCP   
   MSGID:  5d5d1fee   
   REPLY: <6f361eed5b.DaveMeUK@BeagleBoard-xM> 45c0018c   
   PID: SoupGate-Win32 v1.05   
   On Mon, 10 Feb 2025 18:47:21 GMT, David Higton  wrote:   
      
   >In message    
   >          Mike Scott  wrote:   
   >   
   >> Hi all. I think a latching relay is the way to go for a pico-based job I   
   >> have in mind. However the prevalent ones all seem to be controlled by a   
   >> pulse on a single input wire which flips and flops the state.   
   >>   
   >> No doubt they reset to a known-state at power-up.   
   >   
   >It has always been my understanding that they retain their current state   
   >indefinitely, until the next pulse.  So there is no such thing as a   
   >reset state.   
   >   
   >David   
   Yes they remain their state BUT sometimes Arduino likes (from experience) &   
   probably Raspi's give of spurious pulses on startup   
   which can be/needs to be prevented:   
      
   Known issue and solutions are on the internet i.e.   
   https://forum.arduino.cc/t/relay-turn-on-whenever-i-turn-on-arduino/644387   
      
   If the state needs to be knows between bootups, store the last setting in a   
   file before/after switching and if needed send the   
   proper setting again after bootup.  That is why I like dual coil relays ;-)   
      
   --- SoupGate-Win32 v1.05   
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