This is a brief breakdown of the proximity sensor stuff for the nano project for the Royal Academy of Engineering.
The proto-board (of which I hand soldered 4) which is used to control 3 1 watt LED's at a time.
The Arduino with it's beautiful wiring.
All 4 sets of 3 lights strung out and finished and working. Well not actually working, they're not plugged in.
The finished bits at the bottom, proto-board, Arduino and the little black guys on stalks are the proximity sensors.