Turn a basic line-following robot into a jousting knight. Append a simple circuit to the chassis, add some personality to your bot, and let the games begin!
"Flip lights" — turn them upside down, and they’re off. Turn them back up, and they’re on. Here's an easy soldering project that's really fun to use. New from Make: Volume 41.
Project animations from the rear of your bicycle using a Raspberry Pi and open-source software. The framerate of the animation depends on the speed you are moving at.