This summer, I taught a week-long class with David Dymesich in collaboration with Zeum, San Francisco's children's museum, and the Gray Area Foundation for the Arts. We introduced a group of kids ages 10-14 to the basics of electronic prototyping. They built moving machines and reactive toys with Arduino processors, servo motors, switches, LED lights, and various types of sensors. They learned how to wire electronics and how to program micro controllers.