33 lines
1.3 KiB
Markdown
33 lines
1.3 KiB
Markdown
# ESP32-S3 INMP441 noise indicator
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This ESP-IDF sample reads audio from an INMP441 I2S microphone and indicates
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the smoothed sound level (RMS) using the ESP32-S3 board's onboard RGB LED. The
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microphone's left channel is used because its L/R pin is grounded.
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The LED fades from off to green as the smoothed RMS rises from 0 to 100,000.
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From 100,000 to 1,000,000 RMS, it smoothly changes from green to red; at or
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above 1,000,000 it remains red. These thresholds are 10 times higher than the
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previous settings to make red less likely during ordinary background noise.
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The thresholds are defined by `GREEN_NOISE_RMS` and `RED_NOISE_RMS` near the
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top of [main/main.c](main/main.c). Adjust them after checking the RMS values in
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the serial monitor for your microphone and environment.
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## Wiring
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| Module | Pin | ESP32-S3 |
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| --- | --- | --- |
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| INMP441 | SCK / BCLK | GPIO 3 |
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| INMP441 | WS / LRCLK | GPIO 4 |
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| INMP441 | SD | GPIO 5 |
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| INMP441 | L/R | GND |
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| INMP441 | VDD | 3.3V |
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| INMP441 | GND | GND |
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| Onboard RGB LED | Data | GPIO 48 (on supported board variants) |
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## Build and run
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Open this folder as an ESP-IDF project, select the `esp32s3` target, then build,
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flash, and open the serial monitor. The firmware uses ESP-IDF's I2S driver and
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the `espressif/led_strip` component.
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