Makes me wonder if it would make sense to have rotary encoders for precision work -- something that would work like in an Etch A Sketch. The pointer could be po

Makes me wonder if it would make sense to have rotary encoders for precision work -- something that would work like in an Etch A Sketch. The pointer could be positionned with great accuracy and wouldn't move by accident. It may not be too hard to make a prototype with an Arduino. Or maybe somebody already tried it?