Re: PIR through glass

["Dan" <dtoma@xxxxxxx>]

You can use a proximity senzor (radar based), like the one used in cars.
I have one of these and it works even behind a wood door.
It is connected to the alarm system too.

Dan
----- Original Message -----
From: "Ward, David" <David.Ward@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Wednesday, April 09, 2003 12:21 PM
Subject: RE: [ukha_d] PIR through glass


> Sorry Matthew,  IR at that wavelength is mostly reflected by glass.
> You need to use an external PIR or another sensor technology.
>
> Dave
>
> -----Original Message-----
> From: Matthew Norman [mailto:mafiu@xxxxxxx]
> Sent: Wednesday, April 09, 2003 10:04 AM
> To: ukha_d@xxxxxxx
> Subject: [ukha_d] PIR through glass
>
>
> Does PIR work through glass?
>
> I want to create a welcome light at the front door that turns the
internal
> lights on in the porch before I unlock the door.
>
> I thought I could pop a x10 pir behind the glass so that when someone
came
> to the door and started fumbling with keys the light came on.  Would
this
> work?  I want the effect to be contained and not to trigger when
people
walk
> passed the end of the path like other external PIRs which then blind
any
> passers by.
>
> Just wondering.
>
> Matthew
>
>
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