Little Helpers incorporate an ultrasonic sensor and a motor with Arduino resulting in a simple way to make environments more interactive –
Bodies moving through a space trigger motors, sounding whatever object they are attached to. Movements acquire a resonant trace. The use of movement as a trigger is intended to initiate performative engagement, drawing passersby into interactive exchange and making audible the impact of their movements upon their immediate surroundings.
Check out the project page for video and source code – Little Helpers