i was trying that:
The Arduino Mega has an additional four: numbers 2 (pin 21), 3 (pin 20), 4 (pin 19), and 5 (pin 18).
is there anybody who has ever used INT2, INT3, INT4 and INT5 on an arduino mega2560?
because they don't work as they should on my arduino mega2560, and i can't understand why... INT0 and INT1 work well, but the other hardware interrupts don't work...
is there a problem on the library? or on my arduino? or what do you think it is the problem?
thank you very much for helping! 