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

1. Real-time FFT to get frequencies
2. Use MSGEQ7 chip to get the same data
3. Display frequency bands on LEDs as bars

FFT basics:

GitHub: debsahu/ESP32_FFT_Audio_LEDs

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.

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