Re: Occupancy Sensors and Auto Security Bypass

["Andrew Roberts" <andrew@xxxxxxx>]

I've been working on some logic for Comfort to do this for people living on
their own so that they can have the alarm on in certain rooms even though
they are walking around, during say Day mode, protecting just the rooms
that
they are not in. This was suggested as a useful application by Dario of
Eurosistemi. http://www.quiaffari.it/piemonte/eurosistemi/home.htm

It is using a similar logic to what you mention except with just one
pressure mat and a PIR. Basically the pressure mat checks if the 12 hour
timer on the PIR is running and sets a flag and stops the timer if it
is(meaning exiting the room) and if it isn't, it sets the flag (meaning
entering).

Meanwhile the PIR response cheacks the flag and skips the alarm if the flag
is set (occupied) and does not skip the alarm(do nothing) if the flag is
not
set. So it basically does the alarm function which the triggerring of the
designated zone type will do for that mode.

I havn't tested the theory yet but I'm hopeful it will work. Good system
design will be
critical, you must make sure that a pressure mat cannot be accessed by a
potential intruder and that the PIR is a type with a fast 'clear down' on
exit, also the PIR must not point at the area where the pressure mat is.
You could also switch all the flags off when arming to Away Mode just in
case one is still on.
Different Timers and Flags must be used per room, but the responses I've
written don't take very much code.

action codes use
21 is for skip alarm
194 for timers
132 for flags
86 for stop timer
some skips too

I'll test it (soon) and let you know if it works and share the code on the
Comfort egroup.
No point doing it unless it does work.


Andrew Roberts
Comfort Home Controls
(Tel: 44(0)1244 680675)
(Fax:44(0)1244 671455)
WebSite: http://www.comfort.org.uk

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----- Original Message -----
From: paul gordon <paul_gordon@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: 23 June 2000 12:34
Subject: Re: [ukha_d] Occupancy Sensors and No Light Switches


> I don't think this can really be done properly with only one form of
input
> (IE PIR's) - at least not economically!
>
> I think you need a minimum of two types of sensor - PIR for movement
> detection within the room, AND perimeter sensing to detect actual
entry/exit
> into the room.
>
> Perimeter detection could be by pressure pads by the doors - you'd
need a
> minimum of two of them - one outside the door, one inside, to be sure
of
> correctly deducing the direction of travel. This still would need care
to
> ensure you could guarantee detecting someone using the door - IE the
pads
> would need to be big enough to ensure that they would not be stepped
over
by
> accident... Also, some logic would be required to ensure that it
didn't
get
> confused when only ONE pad is activated (someone walking around one
one
side
> of the door, without actually passing through it...)
>
> Alternatively, a break-beam type detector in the door frame,
positioned on
> the "outside" of the door - IE the opposite side to which it
opens - so
that
> the door itself never breaks the beam regardless of whether its open
or
> closed...  This could be high enough of the ground to avoid pets, but
still
> always "see" people passing through.
>
> A combination of both of these types of detector would probably be
most
> reliable - allied with some reasonably simple "state"
tracking - IE start
> off knowing the room is empty, then using the detectors combined
inputs,
> it's possible to keep a counter of exactly how many occupants are in
each
> room at any time.
>
> Entry or exit is determined by the order in which the zones are
tripped,
and
> the delay between each zone. - Of course, it's ALWAYS going to be
possible
> to fool any of these systems, but only if you're in the habit of
> long-jumping through the doors in your house!!
>
> A front door is a far more tricky proposition - what about when
someone
> comes to the door, and you have a conversation with them - both the
inside
> and outside pressure pads would be tripped concurrently (although not
> simultaneously), and a break-beam would not be tripped at all! -
anyone
care
> to think about how you'd program for this scenario??
>
> No doubt about it though - this is going to need a lot of zones!! - a
> minimum of two per door, for every door in a room!...
>
> Why can't it be as easy as it is on Star Trek?? - Any of those
i-button
> gizmo's have anything to offer for occupancy detection?? - How about
> proximity detection within a room, by wearing a special badge?
>
> Regards.
>
> Paul G.
>
>
> >This may be another daft suggestion by me but here goes anyway....
why
not
> >mount the PIRs on the ceiling facing down just in front of the
door, as
you
> >oper the door the sensor would trigger before you got into the
room
(unless
> >you were running!). You'd probably need another sensor 'further in
the
> >room'
> >for once-you-were-in-there detection. This assumes that you close
doors
> >behind you though...
> >
> >Andy
> >
> >
> >
> >
> >
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>
>


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