Subject:
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Re: Gutting an optical mouse - Part I
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Newsgroups:
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lugnet.robotics
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Date:
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Fri, 12 Jul 2002 18:29:12 GMT
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Viewed:
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672 times
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> 5) I removed the rotational sensor because it appeared to be a 360 degree
> potentiometer. It wasn't... it's an encoder. It has 24 detents. There are
> 3 pins. Looking from the side where the scroll wheel is inserted, there are
> 3 pins: 1 (left), 2 (center), and 3 (right). +V is hooked to pin 2. Bits
> 0 and 1 are pins 1 and 3, respectively.
>
> Each detent position is either 00 or 11. So, starting from a 00 position,
> the next detent would be 11, the next 00, and so on. The half-step between
> detents alternates a pattern as well: 00 and 01. Starting from a 00
> detented position and turning gives the following output patterns:
>
> Clockwise
> Detent? Bit 0 Bit 1
> Y 0 0
> N 0 0
> Y 1 1
> N 0 1
> (pattern repeats 11 more times)
It appears to me there is a slight mistake here. According to this, there is no way to distinguish between the first row and the second. I assume the second should be 10, so it would go 00 10 11 01.
Steve
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