I know there are some differences in the interrupt numbering on different Arduino boards.
For example:
UNO: D3 is INT1
Pro-Micro: D3 is INT0
Since I need to specify the interrupt number as the first parameter of attachInterrupt(), how can I write sketches that are portable across board types?
Is there some macro or other way to compute INT number from pin number?
Something like:
PIN_TO_INT(3)
Or at least some definitions that can be tested to determine which board type is being compiled?
Something like:
if(board_type==PROMICRO) INT=0;
Thanks!