Rotary encoder facts for kids
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
Absolute
An absolute encoder always keeps track of what value its on, even if it isn't powered.
Incremental
An incremental encoder only keeps track of changes. It gives off signals if it is turned one way or another.
Images for kids
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A Gray code absolute rotary encoder with 13 tracks. At the top, the housing, interrupter disk, and light source can be seen; at the bottom the sensing element and support components.
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Hall effect quadrature encoder, sensing gear teeth on the driveshaft of a robot vehicle.
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An incremental encoder
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Conceptual drawing of a rotary incremental encoder sensor mechanism, with the corresponding logic states of the A and B signals
See also
In Spanish: Codificador rotatorio para niños
