Pitch detection for musical instruments tuner

[Xelaocram]

Hi everyone,

I'm looking for a well-functioning and precise example of pitch detection with the autocorrelation algorithm...
With the FFT, I can achieve satisfactory resolution (hundredths of a semitone), but many musical instruments have harmonics with amplitudes greater than the fundamental, so it's not suitable.

I use the Arduino IDE.

Thanks

[esp_man]

So just scan through the entire FFT spectrum, looking for the first peak (even if it is not the largest).