Thank you Felix & ajb2k3! I tried to run it using the above changes and the example runs so well on M5stickc Plus. Is it possible to print the values using the Arduino IDE's serial plotter? I tried it like this, but it is not a clean wave ....!! There seems to be an offset in the signal? Thank you so much for saving the day!
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RE: M5StickC or M5StickC PLUS microphone basic example not working [Solved]