Difference between interrupt pin?

[Bamanio]

Hi,

I followed this Wind Speed project:
http://forcetronic.blogspot.com/2016/12/measuring-wind-speed-with-anemometer.html

On the Due, I expected to choose whatever interrupt Pin but found out that using PIN 2 gives totally different results than using PIN 8.

aren't they suppose to be the same on Due?

thanks

[ard_newbie]

AFAIk there should not be any difference, both are Schmitt trigger pins (page 12, Sam3x datasheet).

Did you try with pull down resistors on both ?

[pert]

What is the difference you're seeing? Are you saying you get different wind speed readings depending on which pin is used?