[arduino code examples for AS]-02 how to use INMP441 Microphone

Code:
/*

  ESP32 I2S Microphone Sample

  esp32-i2s-mic-sample.ino

  Sample sound from I2S microphone, display on Serial Plotter

  Requires INMP441 I2S microphone

*/



// Include I2S driver

#include <driver/i2s.h>



// Connections to INMP441 I2S microphone

#define I2S_WS 3

#define I2S_SD 4

#define I2S_SCK 2



// Use I2S Processor 0

#define I2S_PORT I2S_NUM_0



// Define input buffer length

#define bufferLen 64

int16_t sBuffer[bufferLen];



void i2s_install() {

  // Set up I2S Processor configuration

  const i2s_config_t i2s_config = {

    .mode = i2s_mode_t(I2S_MODE_MASTER | I2S_MODE_RX),

    .sample_rate = 44100,

    .bits_per_sample = i2s_bits_per_sample_t(16),

    .channel_format = I2S_CHANNEL_FMT_ONLY_LEFT,

    .communication_format = i2s_comm_format_t(I2S_COMM_FORMAT_STAND_I2S),

    .intr_alloc_flags = 0,

    .dma_buf_count = 8,

    .dma_buf_len = bufferLen,

    .use_apll = false

  };



  i2s_driver_install(I2S_PORT, &i2s_config, 0, NULL);

}



void i2s_setpin() {

  // Set I2S pin configuration

  const i2s_pin_config_t pin_config = {

    .bck_io_num = I2S_SCK,

    .ws_io_num = I2S_WS,

    .data_out_num = -1,

    .data_in_num = I2S_SD

  };



  i2s_set_pin(I2S_PORT, &pin_config);

}



void setup() {



  // Set up Serial Monitor

  Serial.begin(115200);

  Serial.println(" ");



  delay(1000);



  // Set up I2S

  i2s_install();

  i2s_setpin();

  i2s_start(I2S_PORT);





  delay(500);

}



void loop() {



  // False print statements to "lock range" on serial plotter display

  // Change rangelimit value to adjust "sensitivity"

  int rangelimit = 3000;

  Serial.print(rangelimit * -1);

  Serial.print(" ");

  Serial.print(rangelimit);

  Serial.print(" ");



  // Get I2S data and place in data buffer

  size_t bytesIn = 0;

  esp_err_t result = i2s_read(I2S_PORT, &sBuffer, bufferLen, &bytesIn, portMAX_DELAY);



  if (result == ESP_OK)

  {

    // Read I2S data buffer

    int16_t samples_read = bytesIn / 8;

    if (samples_read > 0) {

      float mean = 0;

      for (int16_t i = 0; i < samples_read; ++i) {

        mean += (sBuffer[i]);

      }



      // Average the data reading

      mean /= samples_read;



      // Print to serial plotter

      Serial.println(mean);

  

    }

  }

}