What is Rotary encoder?
[[File:Rotary encoder.jpg|thumb|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== ===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. {{tech-stub}} [[Category:Sensors]]