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Amazing LEGO Mindstorms NXT Wheelchair by Simon Burfield (aka Burf) supports up to 90kg person! "The lastest version uses 6 LEGO Mindstorms NXT’s for moving and 1 NXT(master) for controling the direction. Each of the driving NXT’s has 2 NXT motors attached to it and 2 touch sensors used to control direction. The master NXT has 4 touch sensors connected (forward, back, left and right) and 2 motors to switch on the drive touch sensors. It is programmed in RobotC. Uses 12x 48mm Rotacaster (Lego NXT Compatible Hub) Robot Wheels"