Rotary Encoders Explained

http://en.wikipedia.org/wiki/Rotary_encoder

(but using an old library)
http://ccrma.stanford.edu/~dfl/250/rotary.htm
Here is a write-up I did to explain how rotary encoders can be hooked up to an AVR microcontroller system.
David Lowenfels


c library

http://hubbard.engr.scu.edu/embedded/avr/avrlib/docs/html/index.html

http://www.mil.ufl.edu/~chrisarnold/components/microcontrollerBoard/AVR/avrlib/

http://hubbard.engr.scu.edu/embedded/avr/avrlib/docs/html/index.html


arduino
http://www.arduino.cc/playground/Main/RotaryEncoders