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To help everyone celebrate the upcoming annual rebirth of the sun, 12 leds charlieplexed on 4 lines, in the shape of a decorated pine tree.

12 leds charlieplexed on 4 lines

Plug this into just about any microcontroller with 4 free outputs, such as an arduino or fabkit for instance.

ArPino board layout


As usual, rename the file below to an .tar.bz2 extention before unpacking...

Roithner Laser Technik

Roithner Laser Austria has a wide range of laser products and different optics.