Input Circuit

Wiki > Using FFT to Read Frequencies > image2022-10-24_20-34-26.png

Sample Code

Reference	URL
Arduino FFT Library	https://github.com/kosme/arduinoFFT
ESP32 spectrum analyser VU meter using arduinoFFT and a FastLED matrix	https://www.youtube.com/watch?v=Mgh2WblO5_c
ESP32_FFT_VU - Code	https://github.com/s-marley/ESP32_FFT_VU