Arrays - help!


hello, trying create digital guitar tuner using arduino atmel168.  my idea determining frequency of incoming guitar signal use analogread command sample incoming signal @ 5khz (every 200us) , store number of values in array (about 100 samples should do).  if can pull max values array , count how occur think determine input fundamental frequency.  

i have hardware setup condition guitar signal readable levels (between 0 , 5v, input signal 2.5v biased) , filtered cut out above 600hz.  guitars harmonic frequency generators pretty tough filter each individual note fundamental, input signals max periodically @ fundamental frequency.  i thought using set limit trigger max, amplitude reduce string rings out might not trigger properly, , max values declining.

so question how store 100 input values array @ 200us(or faster) per sample, , determine how many samples occur between each max value?



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