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.

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.

You can find a really Interesting Paper on this at www.faqs.org. 2. Gray code used for shaft-angle encoding. The conducting (golden) areas are arranged in concentric circles, where each circle ...

Permutation codes are mathematical constructs that utilise the properties of permutations to encode and protect information, with applications spanning powerline communications, flash memory ...