On 1/31/2013 8:18 AM, Yan Seiner wrote:
> I have a "smart" relay that has a tri-state control line:
>
> Control line to 12V = relay closed
> Control line open = relay on automatic (closes and opens based on
> internal logic)
> Control line to ground = relay open
>
> I'd like to be able to control this via my 7200.
>
> Is there some way to do tri-state logic at 12V or am I looking at relays?
You can't directly drive a 12v load with a 7200, you could drive two
transistors in a push-pull tho. To make the DIO go open collector
switch the DDR bit for the pin to input.
--
Jason Stahls
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