Quote Originally Posted by mister_e View Post
Hi and welcome aboard

Knowing the "frequency range" and the PIC you're going to use would help. However in some circumstance, PBP COUNT command could do the job.

You could do a search for Frequency Counter or simply Counter with the forum search tool. Sure enough there's a load of tips and example here that might help you.
I used it (count) for a tachometer and it was fast enough. http://www.picbasic.co.uk/forum/showthread.php?t=9037
Alter the math a bit, based upon the wheel diameter and you have it. this is set up for an LED display, LCD would use less code.