INTL 3:770/1 3:770/3   
   REPLYADDR joebeanfish@nospam.duh   
   REPLYTO 3:770/3.0 UUCP   
   MSGID:  890d4736   
   REPLY:  a98397b9   
   PID: SoupGate-Win32 v1.05   
   On Mon, 10 Feb 2025 18:49:04 +0000, Michael J. Mahon wrote:   
      
   > Mike Scott  wrote:   
   >> On 10/02/2025 12:33, Joe wrote:   
   >>> On Mon, 10 Feb 2025 09:12:32 +0000, 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. But I see no   
   >>>> indication of any way of resetting them to that known state without   
   >>>> turning off the power - eg after reloading the pico control program.   
   >>>>   
   >>>> Has anyone used these and can offer advice please? Thanks.   
   >>> I am using the HFD2/005-S-L2-D dual coil relays.  They work for my   
   purpose....   
   >>>   
   >>> See: https://source.hongfa.com//Api/DownloadPdf/323   
   >>   
   >> Thanks for the reply. I was considering complete units (like eg url   
   >> below (*)), which differ in operation. They take a pulse on a single   
   >> logic-level input, and flip-flop between states: my query is how to   
   >> reset from a random state to the power-up state.   
   >>   
   >> The one you reference uses either reverse polarity or a 2nd coil to flip   
   >> and flop.   
   >>   
   >>   
   >>   
   >> (*)   
   >>    
   >>   
   >> (No, I'd not pay that sort of price :-) )   
   >>   
   >   
   > In that case, the only reliable way to proceed is to provide a way to sense   
   > the current state of the relay so that the desired state can be selected.   
      
   Such as an extra pole that you could connect to a sense input to poll   
   and check the relay state.   
      
   --- SoupGate-Win32 v1.05   
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