Still can’t solve the Rubik’s Cube? This LEGO NXT robot will show you how its done. Video after the break.
A motor actuates a prismatic joint that pushes the side of the cube; another rotates the cube’s support; the third one has the double function to help the pusher arm to accomodate the cube on the support and to hold the cube while the bottom face is rotated. The robot uses 2 touch sensors as limit switches for the arms and a light sensor to zero the rotating base [via HackedGadgets]