Hyper Peppy II

HYPER PEPPY II is a robot with a built-in sensor which reacts to vibration from sound or physical contact. It moves forward but when it senses a high pitched noise (such as a hand clap) or vibration from physical contact with an obstacles,it retreats by reversing and turning left for a preset time and then continues forward on a new course. You will enjoy its crispy movement. You can learn the mechanism of sound sensor and the ratchet mechanism.