Folks,
This URL says interrupts 0 and 1 are on digital pins 2 and 3:
These URL's say interrupts 0 and 1 are on digital pins 43 and 44:
Can someone please clarify this for me? Thank you.
Brian
"In addition, some pins have specialized functions:
External Interrupts: 2 (interrupt 0), 3 (interrupt 1), 18 (interrupt 5), 19 (interrupt 4), 20 (interrupt 3), and 21 (interrupt 2)."
(think of these as D2, D3, D18, D19, D20, D21)
"interrupts 0 and 1 are on digital pins 43 and 44."
These refer to physical package pins 43 and 44, PortD bit 0 and 1.
The IDE maps these to software names D21 and D20 which is what you see marked along the side of the board. It would seem there is also some interrupt re-naming.
These two sources are consistent with each other and I would assume they are both correct: