MAX4466 microphone amplifier with ESP32

Supply 3.3-5 V Bus ANALOG Measures sound

Pins and ESP32 wiring

Pin	Role	ESP32 pin	Notes
OUT	Analog output	D34	Audio centred at half the supply. Power from 3V3. To an ADC pin (prefer ADC1: GPIO 32 to 39)
GND	Ground	GND
VCC	Power	3V3

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); }

void loop() {
  int mv = analogReadMilliVolts(34);  // OUT on GPIO 34
  Serial.println(mv);
  delay(200);
}

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