hi All i have my android phone sending 4 different frequencies to the Arduino analog in using the earphones jack. i need my arduino to find out which frequency is coming in, and do some actions according to the certain frequency. my question is, how can i extract the input frequency and save it a…

Find analogIn frequency using FFT library

KeithRB January 20, 2013, 8:58pm 2

It might be best to change them to square waves and measure the period.

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