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http://pinkypibot.blogspot.com/ Here is a link to my blog that has a lot of project details. Current code available as txt files Arduino and Python. UPDATE 08-19-2013: I now have the iPad app (RasPiConnect) operating and the bot doing basic obstacle avoidance. Integrating camera next, then some OpenCV processing.
This is a companion discussion topic for the original entry at https://community.robotshop.com/index.php/robots/show/rpi-arduino-ipad-robot