What is the use of MEGA8U2 chip in the Arduino ADK?

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« on: February 24, 2013, 06:36:02 pm »

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I have been working on a senior project that involves communicating an Arduino board to a phone. Now I was going to use the Arduino ADK but because of dimensions issues I have to make my own print circuit board. I have been comparing these two boards and found that the Arduino has an extra microprocessor. I didn't know what its purpose is for and was hoping someone could help.

Arduino http://arduino.cc/en/uploads/Main/ADK_MEGA_2560-Rev2-sch.pdf

Electric Sheep http://dlnmh9ip6v2uc.cloudfront.net/datasheets/Dev/Android/electric_sheep-v11.pdf