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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Loop
Actually after having posted it came to my mind that I could google for "capacitance arduino" and actually found this: http://arduino.cc/en/Tutorial/CapacitanceMeter#.UxWz6vRdX2c
Which is not simple, but doable. I'll let you know if I make any progress.
Cheers!