https://github.com/sheaivey/esp32-audioini2s

A simple MEMS I2S microphone and audio processing library for ESP32.
https://github.com/sheaivey/esp32-audioini2s

arduino-library audio audio-processing esp32 esp32s2 fft frequency i2s inmp441 mems microphone oled vumeter ws2812b

Last synced: 4 days ago
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A simple MEMS I2S microphone and audio processing library for ESP32.

• Host: GitHub
• URL: https://github.com/sheaivey/esp32-audioini2s
• Owner: sheaivey
• License: mit
• Created: 2022-08-10T06:49:23.000Z (over 2 years ago)
• Default Branch: master
• Last Pushed: 2024-09-02T19:20:13.000Z (4 months ago)
• Last Synced: 2024-12-18T22:08:52.508Z (4 days ago)
• Topics: arduino-library, audio, audio-processing, esp32, esp32s2, fft, frequency, i2s, inmp441, mems, microphone, oled, vumeter, ws2812b
• Language: C++
• Homepage:
• Size: 96.7 KB
• Stars: 53
• Watchers: 5
• Forks: 11
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# ESP32-AudioInI2S

A simple MEMS I2S microphone and audio processing library for ESP32.

## Features

* Simple I2S sample reading and setup. Just choose the pins, sample size and sample rate.

* Robust audio processing classes for analysis.

  * Simple FFT compute on your I2S samples.

  * Frequency bands in 2, 4, 8, 16, 32 or 64 buckets.

  * Volume Unit Meter.

  * Set a noise floor to ignore values below it.

  * Normalize values into desired min/max ranges.

  * Auto level values for noisy/quiet enviroments where you want to keep values around the normalize max.

  * Ability to set the peak falloff rates and types. NO_FALLOFF, LINEAR_FALLOFF, ACCELERATE_FALLOFF, EXPONENTIAL_FALLOFF.

  * Equalizer to adjust the frequency levels for each bucket. Good for lowering the bass or treble response depending on the enviroment.

#### [AudioInI2S Class README](./AudioInI2S.md)

  * [Basic](examples/Basic/Basic.ino) - Reads I2S microphone data to be viewed in the Serial Plotter.

#### [AudioFrequencyAnalysis Class README](./AudioFrequencyAnalysis.md) (New Way - Pick the frequencies range buckets you want)

  * [FrequencyRange](examples/FrequencyRange/FrequencyRange.ino) - Reads I2S microphone data, processes them into custom FrequencyRange buckets to be viewed in the Serial Plotter.

  * [FrequencyRange-Visuals](examples/TTGO-T-Display/FrequencyRange-Visuals/FrequencyRange-Visuals.ino) - Reads I2S microphone data, processes them into custom FrequencyRange buckets and displays them on a

#### [AudioAnalysis Class README](./AudioAnalysis.md) (Old Way - One Shot frequency buckets 20Hz - 20KHz)

  * [Frequencies](examples/Frequencies/Frequencies.ino) - Reads I2S microphone data, processes them into frequency buckets to be viewed in the Serial Plotter.

  * [FastLED](examples/FastLED/FastLED.ino) - Reads I2S microphone data, processes them into frequency buckets and displays them on a WS2812B led strip.

  * [OLED](examples/OLED_128x64/OLED_128x64.ino) - Reads I2S microphone data, processes them into frequency buckets and displays them on a 128x64 OLED display.

  * [TFT](examples/TTGO-T-Display/Basic-Visuals/Basic-Visuals.ino) - Reads I2S microphone data, processes them into frequency buckets and displays them on a 240x135 16bit TFT display.

240x135 16bit TFT display.

## Hardware 

* ESP32, ESP32 S2, ESP32 C2, ESP32 C3

* INMP441 - MEMS Microphone

## Known Issues

The `AudioAnalysis.h` and `AudioFrequencyAnalysis.h` classes are built on top of ArduinoFF2 V2 develop branch. You can find out more about it here: https://github.com/kosme/arduinoFFT/tree/develop

`AudioAnalysis.h` is not optimized and uses a lot of helper variables and floats. That said it is still very responsive at 1024 sample size and 44100 sample rate.

## Recognition

This library's audio processing would not be possible without ArduinoFFT https://github.com/kosme/arduinoFFT

## Licensing 

MIT Open Source - Free to use anywhere.