A rotary encoder, also called a shaft encoder, is an electro-mechanicaldevice that converts the angular position of a shaft oraxle to an analog or digital code, making it an angle transducer. Rotary encodersare used in many applications that require precise shaft unlimitedrotation—including industrial controls, robotics, special purpose photographic lenses[1], computerinput devices (such as optomechanical mice and trackballs),and rotating radarplatforms. There are two main types: absolute and incremental (relative).
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