Vishay Optical Encoders/Digital Potentiometers

An optical encoder, is an optoelectronic, electromechanical device that converts the angular position or motion of an encoder blade to a digital code. There are two main types: absolute and incremental (relative). The output of absolute encoders indicates the current position of the code-blade, making them angle transducers. The output of incremental encoders provides information about the motion of the encoder blade. This information is typically further processed elsewhere into information such as speed, distance, and position. Rotary encoders are used in many applications that require precise shaft unlimited rotation, including industrial controls, robotics, computer input devices (such as optomechanical mice and trackballs), climate control units, and various user interfaces.