Re: Ocupancy Detection

["Simon Coates" <ecolume@xxxxxxx>]

I sell them!  The PIRs are normally sold with a control unit for switching lighting off (and on) in commercial buildings, but I can supply them separately.  The PIRs trigger a pre-set timer - when this 'times-out' the lighting is switched off.

They are quite expensive at £29.50 + VAT each.  But the pyro sensor used is expensive.  They come with 2 core screened cable attached (approx. 1.0m) - the screen is used as the ground wire with the other 2 cores being 12V and switched return.  If you were using them with HomeVision's 5V inputs you can use a drop-down resistor.

 

Simon

Ecolume Lighting Ltd

Bradford

 

----- Original Message -----

From: Phil Harris

To: ukha_d@xxxxxxx

Sent: 02 October 2001 20:05

Subject: RE: [ukha_d] Ocupancy Detection

Where did you get the PIRs and how much are they?

 

Phil

-----Original Message-----
From: Simon Coates [mailto:ecolume@xxxxxxx]
Sent: 02 October 2001 19:12
To: ukha_d@xxxxxxx
Subject: Re: [ukha_d] Ocupancy Detection

I've been considering using VMD in a few rooms but there's to many potential flaws :o(

Instead I've chosen to use ceiling mounted PIRs for occupancy detection.  The units I've got are small (45 x 45mm) recessed PIRs which are specifically designed for occupancy detection - not the same as standard alarm PIRs.  I've used them before to control lighting in offices.  They are extremely sensitive and will pick up any slight movement - ie. when sat on a sofa watching TV etc...  I'm going to use them in all the rooms in my house for detection, so I can control lighting and heating depending on the time of day etc...

Mounted at 2.5m ceiling height they cover approx. 3.0m radius.  They are 12V open collector switching so I can use them with HomeVision.  In certain rooms I'm installing 2 per room, just to be certain.

 

Simon

 

 

 

----- Original Message -----

From: Alancc

To: UKHA

Sent: 02 October 2001 18:09

Subject: [ukha_d] Ocupancy Detection

Don't know the practicalities of this but if you had a camera in a room could you not use software to tell if someone was moving around or even just sitting on the sofa. I know motion detection software is available but this would not help when sitting still, the system could know what an empty sofa looks like so work out if someone was on it.

 

Any thoughts or should I shut up.

 

Alancc 

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