On http://www.smm.org/ltc/Spencer%27s+Project Spencer is demonstrating his driving game with Lego WeDo sensors. It reminded me of a similar project I made with costless cardboard, linchpins and a PicoBoard. The accelerator is on the left (for the left hand). I made another accelerator which can be put on the floor. More pictures on http://oponoa-programmeertalen.wikispaces.com/Scratch+-+interfaces. (Sorry, the text is in Dutch. But the images speak for themselves.)