> I just scraped an old mouse (a Logitech wheel mouse)
> to see what optical components they used.
> I noticed that the wheel had one LED (IR?) and one
> 3 pin "receiver" mounted. Now, the wheel just have a row
> of spokes, but someway, the unit must not only detect
> spoke/nospoke, but also the direction the wheel is turning.
> Anyone know how these receivers work ?

Two detectors in quadrature?


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