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From: esupg@warwick.ac.uk (Andrew Bargery)
Newsgroups: sci.electronics
Subject: Re: measuring vehicle speed
Keywords: car speed
Message-ID: <1{Z{K_C@warwick.ac.uk>
Date: 21 Jun 91 19:07:30 GMT
References: <31529@hydra.gatech.EDU> <1991Jun20.024446.18473@en.ecn.purdue.edu> <1254@sppy00.UUCP>
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I`ve only just caught this thread, so forgive me if I am repeating. I am
currently building a car speedo/odo trip computer for competition use. When I
was looking at commercially available units, the use two types of pick-up :

speedo cable drive : a sensors that connects to the speedo drive. I believe
                     they are usually hall effect devices.

inductive pick-up  : This seems a better method. Uses a standard inductive
                     proximity switch triggered of the rear of the wheel
                     bolts. I fitted one on the front strut of my car, with
                     the sensor close to my brake disc. They cost about 25
                     pound over here. It is recommended that the sensor be
                     used on a non-driven wheel, however, the validity of
                     that depends on whether you need the sensor for road-
                     speedo use or competition-odo readings. Email if you
                     want more details...


------------------------------ esupg@uk.ac.warwick.cu -----------------------
  DISCLAIMER:       Andrew     University of Warwick, Coventry, UK.
                     Bargery   154 Brunswick St, Leamington, CV31 2ER, UK.
I plead the 5th...             vox : +44 926 881264