Re: Re: Intelligent Light Switching - Thoughts?

["Graham Butler" <graham@xxxxxxx>]

Had a thought along similar lines - stick a PIR on the wall under the desk.
Sit down and it detects your legs :-)

G
----- Original Message -----
From: "PatrickLidstone" <patrickl@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Wednesday, January 02, 2002 11:15 AM
Subject: [ukha_d] Re: Intelligent Light Switching - Thoughts?


> --- In ukha_d@y..., "Steve B" <steve@b...> wrote:
> > Could you not improve this with better PIR position or more than
> one ?
>
> How's this for a barking mad bit of lateral thinking?
>
> Put a light sensor in the vicinity of the seat.
>
> 1. PIR detects movement and turns light on.
> 2. Timer started
> 3. Mark sits down for a 3 hour nap at his desk
> 4. Light sensor goes from light->dark even though room is lit.
> 5. Timer expires. If light sensor is dark - reset timer; if light
> sensor is light room is empty - turn off light.
>
> Major issue is positioning light sensor adequately. It doesn't have
> to be directly fixed to the chair - as long as it is in a shadow
> (perhaps on the floor in the vicinity of the desk?)
>
> Patrick
>
>
>
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