Spinning the rotary encoder cycles through a menu of programs on the 16×2 LCD, and the key map just updates automatically for the chosen program.

The circuitry is basically that and a rotary encoder plus a tiny LiPo battery. Can we talk about the finish on those prints? Yes, those are both printed enclosures.

In devices which use rotary knobs, the AS5601 and its paired magnet may replace a rotary encoder without any change to the host microcontroller or its application software.

A 10bit magnetic rotary encoder ic for contactless position sensing is said to combine the industry's lowest power and smallest size.