Re: Re: PIR control of lights

["Jon Payne" <jgpayne@xxxxxxx>]

Patrick, sorry if you've said before, but where can you(I!) get some of
these modules?

Thanks,
Jon
----- Original Message -----
From: <patrick@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Wednesday, February 26, 2003 7:33 AM
Subject: [ukha_d] Re: PIR control of lights


>
> I think the underlying message here is that PIR switching can work
> reliably, but that you have to use sensors that are independent from
> the security system. Security PIRs are poorly suited to light
> switching because of their inbuilt immunity to false alarms - PIR's
> optimised for occupancy detection are readily available and do a
> superb job. The Matsushita module I have on my workbench at the
> moment will detect sub-cm movement over a couple of metres pretty
> much instantly, just what you want for this kind of application - and
> probably sensitive enough to keep the lights on even if you're lying
> in the bath and just wiggling your big toe.
>
> Patrick


http://www.automatedhome.co.uk
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