Re: Re: Occupancy detection

["Simon Coates" <ecolume@xxxxxxx>]

Stephen,

A 'traditional' PIR is the type used for security purposes and is designed
to minimise false alarms - ie. by having pulse counting etc...
An occupancy sensor is much more sensitive as it is designed to detect
slight movements of a person in a room.  For example, sitting at a desk or
sat on a sofa watching TV etc...

The occupancy detectors I've supplied to people on the group in the past
are
recessed ceiling mounted detectors.  They require a 12V DC supply 1mA (not
including load) and have an open collector output rated at 40V max 25mA -
and can be directly connected to HomeVision, Comfort etc.. The coverage is
360 degrees and the detection pattern is 3 concentric 'rings' - 14
concentrated zones in the centre, 24 zones from about 1m to 2m then 24
zones
>from

I've also been working on some tiny occupancy detectors that were based on
the Matsushita PIR (very small and very sensitive) unfortunately I cut off
the ends of 3 fingers a few months ago and that's put me behind on a lot of
other things - also the factory burnt down just before Christmas and I lost
most of my equipment and stock :o(  Just call me lucky !!!

However I have some of the original PIRs if you are interested.

Regards


Simon Coates


----- Original Message -----
From: Stephen <yahoo@stephenorme.freeserve.co.uk>
To: <ukha_d@yahoogroups.com>
Sent: 25 January 2004 17:55
Subject: Re: [ukha_d] Re: Occupancy detection


> On Fri, 16 Jan 2004 22:43:45 -0000, you wrote:
>
> >Go here http://www.ukha-archive.com/cgi-bin/namazu.cgi?
> >query=ecolume+pir+occupancy
> >
> >The "ecolume" occupancy PIRs do work a treat, a few of
us have
> >them.  Well, I had them in my last place, and will have them
again.
>
>
> Hello,
>
> Please can I ask what is the difference between a
"traditional" pir
> and an ocupancy detector? From what I have "overheard" here,
a
> standard pir will trigger when it detects movement, but it seems that
> an occupancy detector is much more sensitive, and will trigger on much
> smaller movements. Thjis would be great to automate lights, because
> with a normal pir, if you stop walking the lights would go off, but it
> sounds as if an occupancy detector would keep the lights on.
>
> How do you connect an occupancy detector? Do they switch 240v ac or
> 12v dc? Does their output remain high as long as movement is detected?
>
> The only one I have found is in screwfix but it only has a 90 degree
> range. Are there any with better ranges; for automating room  lights
> really 360 degrees would be best.
>
> What is the url of rapid? It is such a common word, that google has
> given me many false positives.
>
> Thanks,
> Stephen.
>
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