A KY-040 Rotary Encoder Module is an electromechanical input device that translates 360-degree rotational movement into digital quadrature signals. Unlike traditional analog potentiometers, it offers infinite, continuous rotation in either direction without physical end stops. By tracking the sequence of output pulses from two offset internal contacts, microcontrollers can determine both the direction and step count of rotation. Additionally, pressing down on the metallic D-shaft triggers an integrated momentary push-button switch, providing an all-in-one rotary and selector interface.

This product is featured by Famephase Electronic Accessories as an ideal input component for digital volume controls, menu navigation systems, 3D printer interfaces, and precision motor speed control.