I don't own a frequency counter, but I was interested in checking accuracy of system clocks and also RTCs. I'd seen a couple frequency counter sketches around, but they used the system clock as their time base. I thought that by using the 1Hz signal from a GPS receiver I could achieve pretty good ac…

GPS-based frequency counter library

udoklein February 1, 2013, 5:40pm 2

I think you should disable timer0 in order to avoid spurious glitches.

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