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From: martingriffith@SPAMbtopenworld.com (Martin Griffith)
Subject: Re: A simple angular positioning solution?
Date: Tue, 29 Oct 2002 12:07:09 +0000 (UTC)
Organization: BT Openworld
NNTP-Posting-Date: Tue, 29 Oct 2002 12:07:09 +0000 (UTC)
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On 29 Oct 2002 02:05:42 -0800, email@example.com (WHF)
>I was wondering if anybody out there had come up with a solution to
>problem similar to this or even whether they had ideas on how this
>might be done?
>I am designing something that has a plastic mechanical dial on it,
>which can click into 1 of 4 locations. Each of these locations will
>signify a mode of operation for the device. I must get the processor
>to recognise what position the dial is in, to determine what mode has
>I have experimented with hall effect proximity sensors, and having a
>different 2 bit binary number on each segment of the dial, but both of
>these require having some electronics on the dial which is not the
>Another idea I had was to have holes and blanks in each segment
>representing binary 1's and 0's. This would require having some
>optical transmitting and sensing circuitry on either side of the dial
>to determine which position it is in.
>Anyway All ideas would be appreciated.
Depending on the speed of rotation..
If the disc only changes position occasionaly, use two microswitches
that line up with the holes, instead of the opto's.Or you could have
notches around the edge of the disc for the microswitches
This is the simplest solution i can think of.
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