YOU BUILT WHAT?!

摘要

Three ultrasonic sensors at the top of the trunk emit inaudible high-frequency sounds and listen to the echoes to determine a person's proximity. Each sensor triggers a different sound. One elicits piano notes, for example, and tunes them according to distance. An X-band sensor (similar to those in home alarm systems) measures speed. Shaffer coded the sensor to alter a digital drumbeat based on a dancer's pace.