From: "Robbie Banks"
Subject: Re: Proximity Detector
Date: Wed, 16 Oct 2002 09:36:50 +0100
NNTP-Posting-Date: 16 Oct 2002 08:36:42 GMT
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I don't know if this is a goer, as it's in a workyard with lots of obstacles
(sp?) and garbage in the way, so mirror alignment would be a pain. Thanx
"davidh359" wrote in message
> given that it can be tough to get the perfect aim, etc., for a large area,
> and not knowing where he is getting in, what _I_ would do in this case, is
> get an inexpensive laser pointer, set it about 10 inches(around 20cm) from
> the ground, get some surplus front surface mirrors and set them at angles
> the corners, and have a simple phot transistor detector circuit at the end
> of the loop. UNless the guy is looking for it, the visable laser beam
> shouldn;t be a problem here in this simple case. THe heigh is set so a
> normal walking pattern will break the beam. Some experimenttion may be in
> order here. It's a fairly cheap way to set up a perimetor detector around
> wide area. GOod luck catching him!
> "Robbie Banks" wrote in message
> > Can anybody suggest a suitable detector. I've been looking for something
> > that covers an area of about 30m with a 60 degree angle spread. All the
> > sensors I have found only seem to have a range of about 15m.
> > It's to connect to a push solenoid to operate a video camera. The idea
> > to catch the theiving git that's making of with contents from the yard.
> > suggestions would be appreciated.
> > Robbie