This E-blocks board contains two rotary encoders an LED and a push switch. Rotary encoders are popular input devices used to varying a value in your embedded system like for example a volume control. Unlike a conventional potentiometer these do not have a start and end position but keep on turning in either a clockwise or anti-clockwise direction. These encoders are very tactile and produce small clicks as rotated. This is supported in Flowcode 4.5.