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Question: Do you have any suggestions on how to detect a doorbell ring sound on an ESP32 microcontroller with a microphone module?
Asked by Jesse (74.105.72.x) on August 22 2023, 1:52am
Reply on August 22 2023, 12:57pm (edited at August 22 2023, 12:58pm):
    Probably do a windowed FFT and look for a lot of activity in the frequency bin that corresponds with the bell, and see if it's above a certain threshold above the sum of the rest of the bins? Alternatively you could multiply the signal with a sinewave and cosinewave of the doorbell frequency, summing, and look for a large sum of absolute values there, or something...

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