Rotary encoder

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An incremental rotary encoder

A rotary encoder is a device that can keep track of how much something has turned. This is called its angular position. That information is useful to know how far a motor has turned, for example.

Rotary encoders are often used in manufacturing and robotics. This is because they need things to be measured and controlled very accurately.

Basic types[change | change source]

Absolute[change | change source]

An absolute encoder always keeps track of what value its on, even if it isn't powered.

Incremental[change | change source]

An incremental encoder only keeps track of changes. It gives off signals if it is turned one way or another.