A Rotary Encoder is an electro-mechanical device used to concert the angular position of a shaft to a digital signal. This is designed in different mounting styles such as hollow-shaft, hub-shaft and shafted. It is available with a easy to use push-button that can be pressed onto the knob for shutting-off the separate switch. Its one side has 3 pin connector with two pins on the other side. It is used as rotation sensors to rotate all the way constantly. It is divided into 30 segments that can easily move in clockwise or counter-clockwise directions.