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Hi Gary,

Do you have some Arduino code somewhere showing how to use it as a counter?

I am also wondering if you would be better off connecting an accurate clock (such as the 1pps on a GPS module or from an OXCO) then using interupts to gate the frequency input. I have built an Arduino based WSPR generator designed by W3PM some years ago and it is accurate to less than 1 part in 10Million.

Cheers,
Peter - VK2AN