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Lex,
I had thoughts along these lines, but a simple test of an optical mouse shows that the "slippage" inherent in returning the cursor to a known point on a computer screen means that the mouse (in its unaltered state) will not be up to the task. I also tried printing a sheet with alternating light and dark lines to try to improve the repeatability, but this did not work either. At the time I was thinking of using the mouse as a linear encoder for focus control.
Maybe somebody with more knowhow or persistence could manage to make it work, but from my point of view buying a linear encoder will be simpler and more effective.
Regards,
David.
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