Day 1 - Prototyped volume control, scrolling, and button press on a KY-040 rotary encoder. Button press was done with a timer based debounce, but nailing down debounce logic for volume/scrolling was more tricky… The solution I landed on was making a state transition table, which maps changes in the encoder’s quadrature signal to a physical turn, CW or CCW. In the screenshot you can see debounce in action - button press is registered 3 times but the actual output only changes once!