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.

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