First of all, if you like this project, please vote for me in the Hurricane Laser Competition and the LED Contest!
Have you ever needed to find out how quickly something is oscillating? For things like hamster wheels and ocean waves, this is easy. You just count how many times the wheel goes around in a certain amount of time, then do some math, and you have the frequency. But what if you're dealing with something a little less tangible like audio waves or electronic signals? That's where digital electronics saves the day.
This Instructable will show you how to build a digital frequency counter capable of measuring events up to 250kHz and will attempt to explain some of the electronics theory behind it. The project costs about $30US, assuming you already have all the tools and equipment required.
This is actually my term project in a Digital Electronics course at the University of Oregon. It's intended as an addition to my term project from the winter term, which was a Function Generator
I also posted to this site.