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3d printer software
Fortunately there is already a pull-up resistor integrated in Arduino that can be activated by the software. http://en.wikipedia.org/wiki/Pull-up_resistor http://arduino.cc/en/Tutorial/DigitalPins#.UyusMYXDIlp #define ENDSTOPPULLUPS // Comment this out (using // at the start of the line) to disable the endstop pull-up resistors