Re: [CAD_CAM_EDM_DRO] Hacking Optical Mice as position/distance encoders

Hmmm,

Point taken Jon although I still can't quite figure out how it si done -
I'll be pulling another mouse to bits tomorrow for sure!! The ones I've been
into so far have just the one sensor per encoder but it does have three
wires. I had assumed that these were simply normal phototransistors but
maybe not. However, even if they are not and are two photodiodes back to
back, they surely can't give real quadrature as I thought that required the
photosensors to be spaced by half a 'line-width'.

Ian
--
Ian W. Wright
Sheffield UK
www.iw63.freeserve.co.uk

----- Original Message -----
From: "Jon Elson" <jmelson@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: 28 February 2001 19:43
Subject: Re: [CAD_CAM_EDM_DRO] Hacking Optical Mice as position/distance
encoders


>
>
> Ian Wright wrote:
>
> > ----- Original Message -----
> > From: "Tim Goldstein" <timg@...>
> >
> > > If you open up standard a mouse you will find 2 low line count
quadrature
> > you would get 1440 counts
> > > per inch in quadrature which works out to just
> >
> > Tim,
> >
> > Where do you get the quadrature from, all the mice I have ever opened up
> > only have a single optical sensor
>
> They usually have a single sensor comonent, but it has to sense light at
two
> locations to determine direction. It DOES use quadrature, or there would
be
> no way to tell which way the mouse is moving.
>
> Jon
>
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