ESP32_OSC_IMU/lib/M5Stack/examples/Fire/Microphone/Microphone.ino

/*
 microphone test

   hardwware:  M5StackFire 

 please use the serial plotter in the Arduino IDE to show the signal
 change the baudrate of the plotter to 115200
 
 September 2018, ChrisMicro
*/

#define M5STACKFIRE_MICROPHONE_PIN 34

void setup() 
{
  Serial.begin(115200);
}

void loop() 
{
  int micValue = analogRead(M5STACKFIRE_MICROPHONE_PIN);

  Serial.println(micValue);
  delay(1);       
}