I have been using the digital pins 2,3,18& 19 as external interrupt pins.
Pin 2&3 working fine but pin 18&19 doesn't work perfectly as expected (intermittent).
I have attached a WiFi shield to my Arduino Mega.
Is it possible to use pin 18&19 as interrupt pins even though i have already connected a WiFi shield on it?
Can anyone please advise on this?