UKHeliBob:
Why complicate things by doing that ?I am not convinced that you need to use interrupts in the first place but if you insist on doing it that way using pin change interrupts throughout would be my advice.
Have you got the PinChangeInt library installed ? It comes with examples.
Ok Thanks againn! I finally worked out the interrupt and sensor issues! I am still working with 2 external interrupt pins and 1 pin change interrupt. Although now this idea seems quite simple that I can use all the pins as pin change interrupt but anyway, if I face any problem i may use the other method!!