Re: Dual Tech motion detectors with dual relay outputs ?

["Robert L Bass" <RobertLBass@xxxxxxxxxxx>]

> The Visonic K-980D would seemingly work too -- assuming that the specifics
> of how to access the LED and its mode of powering are amenable to the hack.
> I'd use the first blink of the green LED to trigger a monostable timer to
> actuate a relay for a few seconds. That relay would provide the output of
> the "occupancy" detector.  The factory relay would provide the "intrusion"
> detector.

That should work.

> If I were to use two physically separate motion detectors (PIR and Dual
> Tech), am I correct in assuming that -- all else equal -- a Quad PIR would
> provide fewer falses than a Dual PIR with almost as quick a response? If
> the detector has to scratch its head for much more than a second or so,
> it's not an improvement over what I've already tried and rejected.

Yes, a quad PIR *should* be more stable than a dual, all else being the same.

> I've been working on this lighting path project ("Lighting Vectors") off
> and on for 7-8 years. Time to get it done ...

By vectors do you mean direction of travel as in "occupant entering" vs "occupant exiting"?  If so, have you looked at the Visonic
SPY series detectors?  If you place one in the ceiling or wall just inside a door and another just outside you can count occupants.
It's not perfect.  You'd need to incorporate a function to clear a room if there's no activity for n minutes.

> With the renewed emphasis on daylight harvesting
> and energy conservation one would think that a dual
> output model (occupancy and intrusion) would be
> commercially available...

The problem is that dual outputs would add to the cost.  Since the vast majority of users (alarm companies and DIYers) only
want/need a single, form "A" output, that's what alarm manufacturers are churning out.

> Of course that would mean acknowledging limitations
> of dual tech sensors ;-) What am I missing here ?

Not a thing.  From previous threads you've apparently got a good handle on how things are in the trade.  :^)

If you want to try a few different detectors to see which works best for the app let me know.  As long as they're in new condition
I'll let you experiment and send back what you don't need.

--

Regards,
Robert L Bass

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Bass Home Electronics
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http://www.bassburglaralarms.com
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