There were quite a few pie wedges, so the device had multiple foil strips per wedge forming a 4-bit binary ... rotary position encoder. Real rotary position encoders use Gray code to prevent ...

Rotary and linear optical encoders are common in position and motion sensing. Rotary and linear optical encoders are common in position and motion sensing. Here, a disc or plate containing opaque ...

There’s a problem with rotary encoders, though: it’s going to use Gray code or something weird, and getting a rotary encoder to work with your code isn’t as easy as a simple button.