Jason Stahls wrote:
>
>
> 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.
>
Thanks. I figured something like that.
The smart relay currently has a manual switch installed, which I'd like
to keep. The goal is to have the 7200 only take control if the manual
switch is in the open position (the pin is open).
Do you have any ideas on how to sense the current state of the control line?
------------------------------------
Yahoo! Groups Links
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/ts-7000/
<*> Your email settings:
Individual Email | Traditional
<*> To change settings online go to:
http://groups.yahoo.com/group/ts-7000/join
(Yahoo! ID required)
<*> To change settings via email:
<*> To unsubscribe from this group, send an email to:
<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/
|