Encoder technologies abound, but software, wiring, and embedded microprocessors let designers tailor magnetic-encoder performance to application requirements.

A while back we featured a magnetic rotary encoder that [LongHairedHacker] designed. The heart of the system is an AS5043 magnetic rotary sensor which runs from $6.5-$11 and has a 10 bits precision… ...

Once you have a suitable donor mouse with a rotary encoder, you will gut the mouse removing the scroll wheel, rotary encoder, cord, and circuit board.