Re: moving away from the remote-control paradigm

["Mick Furlong" <dorsai@xxxxxxx>]

It should be possible to come up with a reasonably reliable system using a
combination of beam breaks and PIRs. For example beam in living room door
is
broken plus activity on PIR in Living room = living room occupied, beam in
living room door broken and no activity on PIR = living room empty. If you
couple this with counting beam breaks you will have a reasonably reliable
system especially if you set the timing so that the system only flags the
Living room as empty once there has been no movement for say 10
mins....personally I can't sit still for 5 mins unless I am asleep ;)

Mick

Mark McCall <mark@xxxxxxx> said:

> Remember reading way back at the start about this guy that had two IR
beams
in his door frame.  Order they were broken in gave direction of travel and
central controller kept a count of people as they went in and out so it
didn't turn lights out until it knew there was no one left in the room.
>
> He couldn't figure out why lights were still on one time and no one
was in
the room.  Then he remembered he'd carried a chair into the room which was
slightly in front of him and seen as another person :-)
>
> Nothing's perfect in this game.
>
> M.
>
>   ----- Original Message -----
>   From: Mark Harrison
>   To: ukha_d@xxxxxxx
>   Sent: Wednesday, August 08, 2001 4:39 PM
>   Subject: RE: [ukha_d] moving away from the remote-control paradigm
>
>
>   Kieran,
>
>   Thanks.
>
>   Is there some way of sensing not just that I've been through a
doorway
>   (broken a beam), but to tell which DIRECTION I was going in.
>
>   Given that there are only 2 of us in the house, it wouldn't be
beyond
>   the wit of man to be able to say that "person enters
room", ROOM IS NOW
>   OCCUPIED, "person enters room", "person leaves",
"person leaves", ROOM
>   IS NOW EMPTY ... type of thing, but this is contingent on being able
to
>   detect the diffence between "enters" and
"leaves".
>
>   Regards,
>
>   Mark Harrison
>   Head of Systems, eKingfisher
>
>         Yahoo! Groups Sponsor
>
>
>
>
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