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Reply-To: "fred bartoli"
From: "fred bartoli"
Subject: Re: A simple angular positioning solution?
Date: Tue, 29 Oct 2002 13:33:24 +0100
X-Newsreader: Microsoft Outlook Express 5.00.2314.1300
Organization: Guest of ProXad - France
NNTP-Posting-Date: 29 Oct 2002 13:31:29 MET
WHF a écrit dans le message :
> Hi all,
> 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
> been selected.
> 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
> ideal situation.
> 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.
Have black and white strips on one side, and use optical reflexion.
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