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High resolution rotary encoder

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I'm trying to find a way to translate small angle rotation into some form of digital signal. 1 degree resolution would be excellent, but something like 5 degrees would be ok.

I need something like a rotary encoder, but with much higher resolution, similar to what we see inside old rubber ball mouses, which have an encoding disk and IR leds/sensors to detect when the disk spins.

Is there any commercial component that would do that? Or I will need to build it myself?

Thanks in advance!


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