RE: Occupancy detection

["Kenneth Watt" <kennwatt@xxxxxxx>]

Simple solution, in 9/10 cases, is a hard-wired magnetic contact switch
on the door wired to an input port on HV. The theory goes that if the
door is closed and, therefore the contact closed, that the lights/fan
stay on. I did this in my old house and it worked very well, you walk in
the lights come on, you close the door they stay on, okay for a
bathroom/en-suite not so good for other rooms.

K.

> -----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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