Rotary Encoder by volmarias

This sketch is missing a short description

Pins: CLK to 2 DT to 3 SW to 4 This was sort of a neat learning experience, since the instructions at https://tkkrlab.nl/wiki/Arduino_KY-040_Rotary_encoder_module weren't very useful. https://en.wikipedia.org/wiki/Rotary_encoder#Incremental_rotary_encoder was a lot more useful. The full rotation encoding appears to occur over 30ms, implying that there's a limit of about 30 ticks per second, but experimentally it seemed that the limit was much lower. It looks like SW is used as a sort of reset clock, going high then low to indicate that the dial hadn't been turned in several seconds.