12 coin
            puzzle solution

Saladin's Puzzle.
12 coins, one is of different weight. Measure on a balance which one is false and if it is heavier or lighter. Solved with information theory.

Rubik's Cube    Rubik's Cube solution (oplossing. Dutch): rubik.pdf

Printer Music (Arduino)

video: Playing music with a
            printer (video)

schematics: Printer
            music schematics
Arduino program

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Prof. Peter Stallinga