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WLED/usermods/audioreactive/readme.md

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Audioreactive usermod

Enables controlling LEDs via audio input. Audio source can be a microphone or analog-in (AUX) using an appropriate adapter. Supported microphones range from analog (MAX4466, MAX9814, ...) to digital (INMP441, ICS-43434, ...).

Does audio processing and provides data structure that specially written effects can use.

does not provide effects or draw anything to an LED strip/matrix.

Additional Documentation

This usermod is an evolution of SR-WLED, and a lot of documentation and information can be found in the SR-WLED wiki:

Supported MCUs

This audioreactive usermod works best on "classic ESP32" (dual core), and on ESP32-S3 which also has dual core and hardware floating point support.

It will compile successfully for ESP32-S2 and ESP32-C3, however might not work well, as other WLED functions will become slow. Audio processing requires a lot of computing power, which can be problematic on smaller MCUs like -S2 and -C3.

Analog audio is only possible on "classic" ESP32, but not on other MCUs like ESP32-S3.

Currently ESP8266 is not supported, due to low speed and small RAM of this chip. There are however plans to create a lightweight audioreactive for the 8266, with reduced features.

Installation

using latest arduinoFFT library version 2.x

The latest arduinoFFT release version should be used for audioreactive.

  • build_flags = -D USERMOD_AUDIOREACTIVE -D sqrt_internal=sqrtf
  • lib_deps= kosme/arduinoFFT @ 2.0.1

Configuration

All parameters are runtime configurable. Some may require a hard reset after changing them (I2S microphone or selected GPIOs).

If you want to define default GPIOs during compile time, use the following (default values in parentheses):

  • -D SR_DMTYPE=x : defines digital microphone type: 0=analog, 1=generic I2S (default), 2=ES7243 I2S, 3=SPH0645 I2S, 4=generic I2S with master clock, 5=PDM I2S
  • -D AUDIOPIN=x : GPIO for analog microphone/AUX-in (36)
  • -D I2S_SDPIN=x : GPIO for SD pin on digital microphone (32)
  • -D I2S_WSPIN=x : GPIO for WS pin on digital microphone (15)
  • -D I2S_CKPIN=x : GPIO for SCK pin on digital microphone (14)
  • -D MCLK_PIN=x : GPIO for master clock pin on digital Line-In boards (-1)
  • -D ES7243_SDAPIN : GPIO for I2C SDA pin on ES7243 microphone (-1)
  • -D ES7243_SCLPIN : GPIO for I2C SCL pin on ES7243 microphone (-1)

Other options:

  • -D UM_AUDIOREACTIVE_ENABLE : makes usermod default enabled (not the same as include into build option!)
  • -D UM_AUDIOREACTIVE_DYNAMICS_LIMITER_OFF : disables rise/fall limiter default

NOTE I2S is used for analog audio sampling. Hence, the analog buttons (i.e. potentiometers) are disabled when running this usermod with an analog microphone.

Advanced Compile-Time Options

You can use the following additional flags in your build_flags

  • -D SR_SQUELCH=x : Default "squelch" setting (10)
  • -D SR_GAIN=x : Default "gain" setting (60)
  • -D I2S_USE_RIGHT_CHANNEL: Use RIGHT instead of LEFT channel (not recommended unless you strictly need this).
  • -D I2S_USE_16BIT_SAMPLES: Use 16bit instead of 32bit for internal sample buffers. Reduces sampling quality, but frees some RAM ressources (not recommended unless you absolutely need this).
  • -D I2S_GRAB_ADC1_COMPLETELY: Experimental: continuously sample analog ADC microphone. Only effective on ESP32. WARNING this will cause conflicts(lock-up) with any analogRead() call.
  • -D MIC_LOGGER : (debugging) Logs samples from the microphone to serial USB. Use with serial plotter (Arduino IDE)
  • -D SR_DEBUG : (debugging) Additional error diagnostics and debug info on serial USB.

Release notes