Two gears one large (120T), and one small (45T) compose the main moving parts of the project.

The small gear rotates about its centre whilst simultaineously rotating around the edge of the large gear, all driven by a single motor at the centre.

Through one of six holes in the small gear a UV LED is mounted.

The electrical connections to the rotating LED are made using slipping connections.

Mounted above the rotating LED is a circular sheet of UV sensitive paper held in place with a circular piece of clear Acyrlic.

All mounted on a square sheet of white Acrylic using M3 x 25mm threaded standoffs.

Driven by a USB adapter or alternatively (4 X AA (1.5V)), batteries.

Alternative use.

This project can quickly be converted to a sand table by doing the following:

1: Replacing the LED with a 5mm cylindrical magnet.

2: Remove the luminous paper.

3: Sit the clear Acrylic disc in the bottom of the hoop and secure on place with tacky to enable easy removal whilst sealing any gaps.

4: Fill with fine sand.

5: A steel ball bearing that can be pulled by the magnet.