>An Arduino can by pretty small. Here is an Arduino compatible that can
do exactly what you ask for.
>https://www.sparkfun.com/products/12765 You can find these on eBay for
a lower price.
Yes, 3.1 version is even better, up to 60MHz:
https://www.pjrc.com/teensy/td_libs_FreqCount.html
A very good candidate for my problem.
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