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 as an integer , (or at least a range ?)
i have downloaded the FFT lib and using fix_fft ()
also went through this discussion but still couldnt figure it out...
It might be best to change them to square waves and measure the period.
square waves +1
what are the 4 frequencies ?
how many pulses can the Arduino expect in one burst?
solution direction: pulseIn() might work or an interrupt based time-measurement if the waves are squared