Does anyone know how/what I need to make to filter out the overtones and harmonics of a guitar? I'm trying to make something like a digital guitar tuner, but it isn't responding correctly to guitar notes. I think it's because of overtones, because my microprocessor is just measuring the period/frequency of the input signal.

Does anyone know how to isolate the fundamental?

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Turn done all tone knobs, use the neck pickup, pluck the string above the 12th fret.