Re: HA Holy Grail #1: Occupancy Detection

["Frank Mc Alinden" <frankmc@xxxxxxxxxxxxxxxx>]

> I've found a PIR at Maplin
> (http://www.maplin.co.uk/Module.aspx?ModuleNo=12576&criteria=PIR&doy=22m8)
> that looks pretty raw.

That looks very like the one i used in my loungeroom pir project.....quite
sensitive .......

I did reply to  your post but it may have got lost in Yahoo as i havent
received it via the group as yet........

Frank

----- Original Message -----
From: "Andy Laurence" <andy@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Tuesday, August 22, 2006 7:44 PM
Subject: RE: [ukha_d] HA Holy Grail #1: Occupancy Detection


> From: Ian Lowe [mailto:ianlowe@xxxxxxx]
>> Remember as well that PIRs normally have a "pulse count"
setting to
>> reduce
>> false alarms - in most cases, the PIR can be made more sensitive
by
>> reducing
>> the pulse count from 3 to 1.
>
> I've found a PIR at Maplin
> (http://www.maplin.co.uk/Module.aspx?ModuleNo=12576&criteria=PIR&doy=22m8)
> that looks pretty raw.  Hopefully it'll be quite sensitive, as there's
> none of the filtering you'd normally get.  I'll probably try one as
it's
> small, and cheap!
>
>> I think any Occupancy system has to use a variety of techniques -
>> pressure
>> pads, beam breaks, pirs, even CCTV with motion detection indoors
>> (although
>> that has it's own "big brother" style concerns).
>
> I was thinking the same thing about multiple sensors.  Pressure pads
would
> be good for places you tend to sit for some time without moving, such
as
> the sofa, and the bath.  Beam breaks will probably make the lights
come on
> a little quicker.  PIRs are probably a good all-rounder for when you
have
> regular movement in a room.  I had thought about motion detection
using
> CCTV, but there's probably issues with clouds varying sun into the
room,
> and other similar factors.  Then there's the processing power required
for
> 10 motion sensing CCTV cameras....
>
> Cheers,
> Andy
>
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