[Kevin Sevcik]

Inf would be because you're getting 0 for the period. Try setting the MaxPeriod to something reasonable. gts.SetMaxPeriod(0.25) or so. The counter class clears out the buffer if it doesn't see a pulse in within MaxPeriod seconds, and I don't know what the default is. Past that, I made my own class that did a little filtering of values so I'd ignore values I knew were bad. I've attached the files, you can try using it. You'd just need to modify "prevResult = 60.0 / period;" to read "prevResult = 10.0 / period;" And you'd want to reduce periodThreshold in the .h file to something like 1e-3 just so it doesn't limit the max RPM to something less that what you can actually output. It's set up so you can use it as a PIDSource for a PIDController.