• They aren't necessarily horizontal. You can orient them whichever way you like.

    If no one else replies, i'll write something up when i get back home later today (don't have the Arduino IDE and the sources here). But the basic idea is, you hook them up to 4 free analogue in ports (the voltage divider ones, for example, without the voltage dividing resistors installed, of course), uncomment the relevant parts of the code, set up the coordinates of the sensors, depending on where you've installed them and that's about it IIRC.

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