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From: agodwin@acorn.co.uk (Adrian Godwin)
Newsgroups: sci.electronics
Subject: Re: Digital dash (was: Inductive pickups.
Message-ID: <7398@acorn.co.uk>
Date: 3 Jun 91 12:30:04 GMT
References: <1970@ole.UUCP> <1991May30.151040.50@cmkrnl.uucp> <847@newave.UUCP>
Organization: Acorn Computers Ltd, Cambridge, UK
Lines: 15

In article <847@newave.UUCP> john@newave.mn.org (John A. Weeks III) writes:
>Of course this assumes that a digital display is actually accurate to
>the resolution that it displays at--which is not a good assumption unless
>it has been calibrated.

Don't just calibrate the digital speedometer - the pulse train it gets from
the speedo is dependent on wheel diameter, which is dependent on temperature
as well as tyre wear. If you want accuracy, consider using a Gunn-diode
microwave unit to measure ground speed by doppler shift.

-adrian

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Adrian Godwin                                        (agodwin@acorn.co.uk)