ESP32 using ICS43434 as MEMS microphone in Arduino IDE

[tolo69]

Hi all,

I want to connect the MEMS-microphone ICS43434 to the ESP32. This microphone chip comprises I2S Interface to transmit the audion data stream. There is an "I2S.h" library compatible for the Arduino board MKRZero. I'm looking for a library for ESP32. Has somebody already done the porting or using similiar library for ESP32 ?

[onehorse]

+1

I am able to use these mics with the nRF52 and STM32L4 and Teensy (various) but am not sure if there is an easy way to do so with the ESP32 Arduino core.

[rudi ;-)]

Hi all,

I want to connect the MEMS-microphone ICS43434 to the ESP32. This microphone chip comprises I2S Interface to transmit the audion data stream. There is an "I2S.h" library compatible for the Arduino board MKRZero. I'm looking for a library for ESP32. Has somebody already done the porting or using similiar library for ESP32 ?

did you try simple insert the megaphone c code example in your arduino project?
try it - i am sure it work's

best wishes
rudi

[tolo69]

The microphone data can be captured. But in the Serial plotter I'm facing square wave, but I would expect analog graph. What do I have to change in my Code?

Code: Select all

#include <WiFi.h>
#include "driver/i2s.h"

void i2s_config() {
  // http://esp-idf.readthedocs.io/en/latest/api/perip herals/i2s.html
  // input
  i2s_config_t i2s_in_config = {
    mode: (i2s_mode_t)(I2S_MODE_MASTER | I2S_MODE_RX),
    sample_rate: 44100,
    bits_per_sample: (i2s_bits_per_sample_t)32,
    channel_format: I2S_CHANNEL_FMT_RIGHT_LEFT,
    communication_format: (i2s_comm_format_t)(I2S_COMM_FORMAT_I2S | I2S_COMM_FORMAT_I2S_MSB),
    intr_alloc_flags: ESP_INTR_FLAG_LEVEL1,
    dma_buf_count: 14,
    dma_buf_len: 64
  };
  i2s_pin_config_t i2s_in_pin_config = {
    bck_io_num: 16,
    ws_io_num: 4,
    data_out_num: -1, //Not used
    data_in_num: 17
  };

   pinMode(17, INPUT);
   pinMode(16, OUTPUT);
   pinMode(4, OUTPUT);

  i2s_driver_install((i2s_port_t)0, &i2s_in_config, 0, NULL);
  i2s_set_pin((i2s_port_t)0, &i2s_in_pin_config);
}

void read_i2s() {
  uint32_t sample_val[2] = {0, 0};
  uint8_t bytes_read = i2s_pop_sample((i2s_port_t)0, (char *)sample_val, portMAX_DELAY);
  Serial.println(sample_val[0]);
}

void setup()
{
    Serial.begin(115200);
    delay(4000);

    i2s_config();
}

void loop()
{
  read_i2s();
}

[hassan789]

The microphone data can be captured. But in the Serial plotter I'm facing square wave, but I would expect analog graph. What do I have to change in my Code?

I don't use arduino, but just looking at your code, here are some ideas:
1. "sample_val" should be signed (aka "int32_t", not "uint32_t")
2. the println might be slowing down your sampling. Might want to buffer up (maybe 100 samples atleast?) and print them all at once

[tolo69]

Correcting the data type of sample_val to int32_t solved the problem Not it works

Thanks a lot

[onehorse]

Please post the entire working Arduino sketch or link to a github repository where I can find it. Thanks!

[tolo69]

It is same sketch as posted above. Just 1 line has to be replaced:
uint32_t sample_val[2] = {0, 0}; ---> int32_t sample_val[2] = {0, 0};