[forbes]

It works essentially the same as a joystick.

If you plug the controller into the driver station computer, open the "FRC Driver Station" program, click on the USB devices tab on the left, and select the controller in the list- you will be able to see the mapping of axes and buttons (starting from 0), and whatever the number left of the controller is in the list will be the number of that "Joystick" in Begin.vi.