This breakout board gives you a pretty slick interface for rotary input. Since rotary encoders turn continuously it can be difficult to imagine where in your range of values you might be at any given time. This board uses two 8-bit shift registers to control a circular LED bargraph which can be used to indicate the virtual position of a rotary encoder. The footprint for the encoder matches up with our illuminated rotary encoders for optimum 'blinky-ness'. The shift register inputs and rotary encoder lines are all broken out to standard 0.1" headers. Project description, more information and ordering can be found at https://www.sparkfun.com/products/11040 Example Code: http://dlnmh9ip6v2uc.cloudfront.net/datasheets/BreakoutBoards/RGB_Ringcoder_Example.ino