Get RPM with Mini Maestro?

I have a Mini Maestro 18-Channel. Now i try to connent a hall sensor to the digital input to get a rpm…
can you tell me if it is possible to use the signal of a hall sensor?
it wold be neccecary to identify the edge of the signal?!



The Maestro is not a good platform for reading signals that change quickly. How fast will the signal be changing?

- Ryan