ESP32 Fast Fourier Transform of Audio & WS2812B mapping

Here we use ESP32 microcontroller to analyze real-time audio signals

• Real-time FFT to get frequencies (99% of code from ESP32-8266-Audio-Spectrum-Display Project by @G6EJD)
• Or use MSGEQ7 chip to get the same data
• Display frequency bands on LEDs as bars

Libraries Needed

Software FFT platformio.ini and Hardware FFT platformio.ini is included, use PlatformIO and it will take care of installing the following libraries.

Library	Link
arduinoFFT	https://github.com/kosme/arduinoFFT
WS2812FX	https://github.com/kitesurfer1404/WS2812FX
MD_MSGEQ7	https://github.com/debsahu/MD_MSGEQ7

Known Limitations

• Sampling frequency must be high
• Sampling time should not interfere with other WiFi functions
• FFT calculations are CPU intensive
• Frequency binning needs to be done manually

Wiring