# ESP32-S3 INMP441 noise indicator

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](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.