RE: Occupancy detection

["Mark Harrison" <Mark.Harrison@xxxxxxx>]

Mike,

You are correct. It was an X-10 wireless PIR, bought in the days before
I started wiring with CAT5e.

I am indeed serious. I have an HA-compliant, non-destructive wife, but
she didn't like being cast into darkness :-)

When you say "no tweaks" does that mean you can't adjust the
"base
pressure"?

Mark Harrison
Head of Systems, eKingfisher


-----Original Message-----
From: Mike Griffiths [mailto:mike@xxxxxxx]
Sent: 3 January 2002 16:21
To: ukha_d@xxxxxxx
Subject: RE: [ukha_d] Occupancy detection


Mark
When you say Mary "took down and hid" the PIR
Are you serious?
I presume it was a wireless PIR??

Well it brought a smile to my face

On a more serious note the normal pressure mats are just that
Over a certain pressure and they change state
No tweaks I'm afraid
The best solution for this is the one I have
The house has such small windows If we are in the house the lights are
on
downstairs and the pressure mats on the stairs turn on and count how
many
people are upstairs


Mike


-----Original Message-----
From: Mark Harrison [mailto:Mark.Harrison@xxxxxxx]
Sent: 03 January 2002 16:13
To: ukha_d@xxxxxxx
Subject: [ukha_d] Occupancy detection

Hmmm... I've been thinking more about this.

At the moment, there's only one room where my "occupancy
detection"
actually works reliably. (Ie both always detects when I come in, and
doesn't give the "false exit".)

This room is my dressing room, and has the key characteristic that, when
I'm in there, I'm moving about. As such, a single PIR, cunningly
positioned, does the trick, together with an HV timeout of about 90
seconds.

This was all sparked from some things that Kieran Broadfoot said at one
of the previous London meets - in fact, the meet in which I uttered the
famous line about an Asian domestic servant :-)

Kieran's ideas have worked out very well, and I'm really finding that
the house WORKS! Remote control is nice, but this is WAY more useful
when it comes to human-house interaction.


In my study, however, I don't move about enough, which got me to
wondering about pressure pads. I have two chairs in the study, both of a
contstant weight.

Is it possible to get a pressure pad with a sort of "trigger
weight"
setting, that could go under the chair. Then EITHER coming into the room
(triggering the PIR) or sitting on the chair would give a "Room is now
occupied" event. But a "Room is now empty" event would only
be triggered
once BOTH a "PIR no longer detects anyone" and a "pressure
pad no longer
reports weight" events had happened.)


In Mary's bathroom it's even worse. After being cast into the dark twice
(once while on the loo, once while in the bath), she has taken down, and
hidden the PIR. With the bath, I can imagine that a pressure-pad
solution would work (ie if the bath is full of water, then the room is
deemed to be occupied, and don't worry about distinguishing between
"full of water" and "full of person".) On the loo, a
"break beam" type
of thing could tell if someone were sitting on it.


Any one got any thoughts about this.


Mark Harrison
Head of Systems, eKingfisher


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