The FollowLight is a bare lightbulb, hanging from three wires, that follows you around the room. Wherever you're standing, you've got plenty of light to read by.

The light is dangling from three monofilament wires, each of which is pulled by a lasercut spool attached to a stepper motor. By arranging these motors in a large equilateral triangle on the ceiling, the motors are able to move their common attachment point (i.e. the lightbulb) within a fairly broad motion envelope.

Each motor has its own motor controller chip (A4988) that gets 5V logic power, 12V motor power, and step and direction commands remotely from the main control Arduino. Both the power and data are carried in custom-wired cat 5 (ethernet) cable to the motors.