RE: HA Holy Grail #1: Occupancy Detection

["Paul Gale" <groups@xxxxxxxxxxxxxxxx>]

Ian - did you not go ahead with a BB on the ultrasonic sensors? I
remember emailing but can't remember if anything happened from there???

Cheers,

Paul.



> -----Original Message-----
> From: ukha_d@xxxxxxx [mailto:ukha_d@xxxxxxx] On Behalf Of
> ian.bird@xxxxxxx
> Sent: 22 August 2006 10:33
> To: ukha_d@xxxxxxx
> Subject: Re: [ukha_d] HA Holy Grail #1: Occupancy Detection
>
> Hi Andy
>
> I use this in the kitchen and have two observations.
> 1) Ambient light in the room should be considered and
> 2) As Paul mentions PIR lag and subsequent X-10 transmission delays
(if
> you use X-10 that is) make the lights slow to _very_ slow at times.
>
> As for my system - I have just had some ultrasonic range sensors
arrive
> from the States and I hope to use these to cover the kitchen area and
then
> with some wizardry I can note the 'normal' distance returned and
thereby
> know when it varies. If it varies it must mean something is in there,
> hopefully a person. With some programming this could become
intelligent
> too and adapt. This might be relevant in the winter for example when
we
> hang washing from the ceiling dryer (there is an AGA in the kitchen so
> everything dries overnight). If all this works I will retire the PIR
> gladly as no movement switching off and long off times to compensate
are a
> pain. This is probably a winter project though.
>
> Thanks
>
> Ian
>
>
>
>
>
>
> "Andy Laurence" <andy@xxxxxxx>
> Sent by: ukha_d@xxxxxxx
> 22/08/2006 09:49
> Please respond to ukha_d
>
>
>         To:     <ukha_d@xxxxxxx>
>         cc:     (bcc: Ian Bird/CV/Novartis)
>         Subject:        [ukha_d] HA Holy Grail #1: Occupancy Detection
>
>
> I've finally puched down all the CAT5 in Node0, so it's time to think
> about lighting.  I've got the switches and lighting controllers
sorted,
> but what I'd really like is automgic lights.  This leads me in pursuit
of
> the holy grail.  Occupancy detection.  Has anyone got a reasonably
> reliable method of occupancy detection?  I'm thinking a sensitive PIR,
> which triggers a timer and turns the light on.  When the timer reaches
> zero the light goes off.  Whenever the PIR is triggered, it resets the
> timer.  I suspect I can do this with xAP Floorplan, although I've not
> checked yet.  Has anyone implemented this?  If so, any recommendations
for
> PIRs?
>
> Cheers,
> Andy
>
>
>
>
>
>
>
> [Non-text portions of this message have been removed]
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>
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