Vehicle proximity censors in driveway

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Article #1487

#1487

From: Bill Pherigo
Date: Fri, 31 Jul 1992 21:18

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     I'm considering laying coils of wire 6 inches under my soon to be poured
driveway to sense the passing of vehicles.  I've seen this done for traffic
lights, but I have no idea how many turns to use.  I assume these work like a
large metal detector, in which case I would make an LC oscillator, with the
coil of wire being the L, and sense changes in the frequency of oscillation,
but I'm not sure.  Any ideas?

Bill Pherigo
<wlp@fc.hp.com>
(303) 229-3586

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From: wlp@hpfcso.FC.HP.COM (Bill Pherigo)
Date: Fri, 31 Jul 1992 21:18:40 GMT
Subject: Vehicle proximity censors in driveway
Message-ID: <7480102@hpfcso.FC.HP.COM>
Organization: Hewlett-Packard, Fort Collins, CO, USA
Path: arc1-ca.pugleaf.net!sparky!uunet!zaphod.mps.ohio-state.edu!sol.ctr.columbia.edu!usc!sdd.hp.com!hpscdc!hplextra!hpfcso!wlp
Newsgroups: sci.electronics
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