This ESP-IDF sample reads audio from an INMP441 I2S microphone and indicates the smoothed sound level (RMS) using the ESP32-S3 board's onboard RGB LED. The microphone's left channel is used because its L/R pin is grounded.

The LED fades from off to green as the smoothed RMS rises from 0 to 100,000. From 100,000 to 1,000,000 RMS, it smoothly changes from green to red; at or above 1,000,000 it remains red. These thresholds are 10 times higher than the previous settings to make red less likely during ordinary background noise.

The thresholds are defined by GREEN_NOISE_RMS and RED_NOISE_RMS near the top of main/main.c. Adjust them after checking the RMS values in the serial monitor for your microphone and environment.

Wiring

Module	Pin	ESP32-S3
INMP441	SCK / BCLK	GPIO 3
INMP441	WS / LRCLK	GPIO 4
INMP441	SD	GPIO 5
INMP441	L/R	GND
INMP441	VDD	3.3V
INMP441	GND	GND
Onboard RGB LED	Data	GPIO 48 (on supported board variants)

Build and run

Open this folder as an ESP-IDF project, select the esp32s3 target, then build, flash, and open the serial monitor. The firmware uses ESP-IDF's I2S driver and the espressif/led_strip component.