If to be more serious, this is small project to get more familiar with electronics: arduino, sensors, actuators and coding. I decided to fabricate bracelet witch’s strength of light depends on compass position. More north it is directed – brighter it shines. The main component for this application is tilt compensated compass module CMPS10. Also I use ‘arduino fio’ (3.3V), which is smaller than classical ‘arduino uno’ and adapted for lithium lon battery. It can be charged using usb cable. To illuminate bracelet panel  I got 3 high luminosity, white diffused leds’. Below you can see photos of creative process:

• I started from super simple step. Circuit scheme of lights and it’s test with arduino uno.
• Then I’ve cut few prototypes to test how different materials diffuse light. Finally Alex’s advice was to stay with crystal acrylic.
• Second version was adapted to insert led’s inside and engraved north sign has nice luminous effect.
• and challenge which is still waiting is to put everything together and make it work..