There is a difference between
#include <FreqCounter.h>
and
#include "FreqCounter.h"
The difference is where the compiler looks for include files. If one doesn't work, because you have not installed the library as a library, try the other one.
There is a difference between
#include <FreqCounter.h>
and
#include "FreqCounter.h"
The difference is where the compiler looks for include files. If one doesn't work, because you have not installed the library as a library, try the other one.