maybe I can post the links in a reply:
http://www.arduino.cc/playground/Code/PIDLibrary
http://www.arduino.cc/playground/Main/BarebonesPIDForEspresso
maybe I can post the links in a reply:
http://www.arduino.cc/playground/Code/PIDLibrary
http://www.arduino.cc/playground/Main/BarebonesPIDForEspresso