Hi.
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 ?

Maybe I'll de-solder a pair and setup a testbed...

No marking on the components, of course...

Jan-Erik.

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