Why Your Rotary Encoder Counts Wrong (And How to Fix It)

Why Your Rotary Encoder Counts Wrong (And How to Fix It) You connect a rotary encoder to your Arduino. You write the code. You rotate the shaft one click. The serial monitor shows three counts. You rotate it clockwise and the count goes down. You rotate counterclockwise and the count goes up. You add a delay. The count is still wrong. Rotary encoder wiring — A and B channels must be debounced either in hardware (RC filter) or software (interrupt-based state table) to count correctly. You assume