Hi guys! I need to measure frequency of sine wave. I try to applyzero-crossing method. I have an interrupt triggered every 250microsec to control if analog read equals middle point of the signal(zerocrossing), also an overflow interrupt to save elapsed time from first middle point of wave to second …

Measuring frequency of sine wave

TomGeorge July 5, 2015, 12:19pm 6

Hi,

What is the frequency range you are trying to measure.

Can you please post a copy of your input circuit, in CAD or a picture of a hand drawn circuit in jpg, png?

Tom....

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