The entire system is basically a big homemade rotary position encoder. Real rotary position encoders use Gray code to prevent slight misalignments and border cases from being a problem.

I needed a rotary encoder — I pulled a cheap one out of ... The output forms a gray code so you can throw away bad states and bad state transitions. However, if you are sure about your input ...

All rotary encoders consist of a light source ... encoders often are arranged to produce a binary output called Gray code. The advantage of Gray code over straight binary is that only one bit ...

Rotary encoders track motor shaft movement for myriad ... unique tracks. The disc produces Gray code output — named after Bell Labs physicist Frank Gray — a binary numeral system for which ...