=head2 phys_to_gpio($pin_num)
 
Maps to C<int physPinToGpio(int pin)>
 
Converts the pin number on the physical board to the C<GPIO> representation,
and returns it.
 
Parameters:
 
    $pin_num
 
Mandatory: The pin number on the physical Raspberry Pi board.
 
=head2 phys_to_wpi($pin_num)
 
Maps to C<int physPinToWpi(int pin)>
 
Converts the pin number on the physical board to the C<wiringPi> numbering
representation, and returns it.
 
Parameters:
 
    $pin_num
 
Mandatory: The pin number on the physical Raspberry Pi board.