Re: Re: Measuring bath water depth

["Frank Mc Alinden" <armagh@xxxxxxx>]

Hi Dave

>Perhaps it would be hoping for too much to convert this into an
> ultrasound room radar for occupancy detection? :-)
Back in the early mid eighties ultrasonics sensors were quite popular.
Thry
did have some drawbacks though , for instance in a room with no
furnishings
they were quite sensitive but when you put carpets etc the ultrasonics
would
get absorbed by the soft  furnishings. Also some people could hear
the
ultrasonic transmitters .......I think they are still in use not to the
extent of pir,s.......

Frank Mc

ps Hows the can bus going


----- Original Message -----
From: "PatrickLidstone" <patrickl@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Monday, August 12, 2002 11:03 PM
Subject: [ukha_d] Re: Measuring bath water depth


> Thanks for a comprehensive reply Dave!
>
> > As a matter of interest on this idea, you could adapt the
> ultrasonic radar
> > that Milford Instruments sell for this application.
www.milinst.com
> and look
> > under General Modules.
>
> Perhaps it would be hoping for too much to convert this into an
> ultrasound room radar for occupancy detection? :-)
>
> Patrick
>
>
>
> For more information: http://www.automatedhome.co.uk
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