[Ether]

Originally Posted by billbo911

I have verified the above code works quite well

Very cool! Thanks for posting that update

You've inspired me. For teams on a really tight budget that can't afford an Arduino, I wrote a small app that will run on any Pentium-based laptop or PC¹ with a parallel port. It uses that port's status pins² to get the elapsed time between rising and falling edges of a single sensor, or between the rising edges of two separate sensors, with +/- 2 μs accuracy.

If there's enough interest³, I'll clean it up and post a white paper.

¹especially on the old junker ones with 133MHz Pentium
²these are pulled up to +3.3 volts on most parallel ports and need only be grounded to generate a signal.
³PM me if you'd be interested.