Lego-Train-Radar-Clock Arduino installed on Lego Train. Uses track to power Arduino. Uses IR LED at 12:00 mark to measure speed, and to calibrate hom. Uses voltage sensing on Rail to sense change in direction. Example Videos: https://www.youtube.com/watch?v=48ty9EczBrk https://www.youtube.com/watch?v=E69kTuxfek8