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Re: Digital 18??!?!
Not sure where you found that resource, but digital 18 was the last digital IO port on the IFI control system (last used by FRC in 2008). The IFI system provided 'default code' which mapped all of the motor and relay outs to joystick inputs and buttons, including 1 relay for the compressor (mapped to digital 18 for the switch), allowing teams to run a robot without programming it, as such most examples suggested that teams use the same IO ports as the default code.
Any digital port will work now, but you have to write a bit of code to do it. The exact way to do this depends on your programming language.
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Kettering University - Computer Engineering
Kettering Motorsports
Williams International - Commercial Engines - Controls and Accessories
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