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Fabrication
The arduino (an UNO clone), the SUB-D9 connector and the 22k resistor were integrated in a metal box (a kind of cigarette case purchased in a low cost shop for 3€50):
The square holes were cutted out with a Dremel fitted with a cutting disk. The accurate locations of the holes for the screws securing the arduino board were identified by printing a real scale arduino drawing on a paper, and gluing this paper on the box.