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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 :-) )

--
Mike Scott
Harlow, England

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