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.

Dubai Elecrow’s CrowPanel Rotary Display is positioning itself as a compact, multifunctional control interface for hobbyists and developers seeking tactile interaction in smart home and embedded ...