INMP441 I2S digital microphone with ESP32

Supply 3.3 V Bus GPIO Measures sound

Pins and ESP32 wiring

Pin	Role	ESP32 pin	Notes
L/R	Not wired to the ESP32	—	Channel select: GND = left, 3V3 = right
WS	SPI chip select	D25	I2S word select (LRCLK), not SPI
SCK	SPI clock	D26	I2S bit clock (BCLK), not SPI
SD	Output (the part drives it)	D27	I2S data out of the microphone
VDD	Power	3V3	3.3 V only
GND	Ground	GND

Suggested wiring for the 30-pin ESP32 DevKit, avoiding flash, input-only and strapping pins. BoardPilot checks it for you as you wire.

void setup() {
  Serial.begin(115200);
  pinMode(27, INPUT);  // SD
}

void loop() {
  Serial.println(digitalRead(27));
  delay(100);
}

InvenSense INMP441 datasheet, I2S interface: SCK, WS, SD, L/R; supply 1.8 to 3.3 V

Part data: CC BY 4.0, free to reuse with credit to BoardPilot.