Roomba Internals : Nosce Your Bot : 2003-01-10 by Jake Luck & John Ioannidis
With the top cover removed, we now have access to the main motherboard and various sensors and control cables.
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Here is a closer look of the internal components. Note the interesting 4 pin port (labled in green) that was not used. Perhaps it is a diagnostic/programming interface?
To hot wire the robot to start without the top panel controls, we examined its interface circuitry.