Forgive me here C and C++ programmers, for I do not dwell within your hallowed halls. This one, from SparkFun, is the most understandable one I have found yet, although I have no idea how long case ...

His TMD-1 was based on 3D printed tiles with embedded magnets — arranging the tiles on a matrix containing Hall effect sensors programmed the finite state machine, with the “tape” concept ...