On 21.10.18 10:20, Martin Patzak wrote:
> Do you meen a switch like e.g. a DS2408?
>
> How do I issue an ON command with timeout? 

There is no off-the-shelf 1wire component that does this. You'll either
have to implement it yourself using AVR or STM32 slave code, or use
external components that require a regular "on" pulse (should be a
no-brainer with a '555), or (my preferred solution these days) a 2-wire
bus protocol like I²C that has hardware support in your
controller-of-choice and thus doesn't depend on millisecond timing to
work right.

-- 
-- Matthias Urlichs


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