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Subject: Re: vechile speed meter
X-Newsreader: Microsoft Outlook Express 6.00.2600.0000
Date: Mon, 11 Nov 2002 16:31:38 -0800
NNTP-Posting-Date: Mon, 11 Nov 2002 16:29:42 MET
Organization: @Home Network
"John Jardine" wrote in message
> abacus-ri wrote in message
> > Hi to all,
> > I need to develop vehicle speed meter with trip computer.Does anybody
> > some idea how to measure a speed without outside sensor.
> > Thanks in advanced
> > Damir
> > --
> > abacus-riSPAM1@email.hinet.hr
> > http://free-ri.hinet.hr/abacus-ri
> > izbrisi SPAM1 u e-mail adresi
> > remove SPAM1 from address
> In a closed system you are stuck with choice of GPS or inertial. Simple
> inertial needs a heavy pendulum and will directly indicate
> as a G value (45 degree =1G), angle analogue then requires integrating to
> give wanted velocity but lots of problems with non-axial forces and drift.
> I'd be inclined to use a clip on magnet and reed switch on one of the
Better is something like 3 magnets on a driveshaft and a hall sensor.
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