namespace ArduinoLibrary
{
public enum class GpioPin
{
    P2 = 3, P3 = 5, P4 = 7, ...
};

public ref class Arduino sealed
{
public:
    static void pinMode(GpioPin pin, PinMode mode);
    static PinValue digitalRead(GpioPin pin);
    static void digitalWrite(GpioPin pin, PinValue state);
};
}