INMP441 MEMS High Precision Omnidirectional Microphone Module I2S - Buy Online in India

Package Includes:

• 1 x INMP441 MEMS High Precision Omnidirectional Microphone Module I2S

Specifications:

Supply voltage	3.3V
Communication interface	Inter-IC Sound (I2S)
Sensitivity	High
SNR	High

• Datasheet

INMP441 I2S Microphone with ESP32 – Sample Code

The following Arduino code configures the INMP441 I2S microphone with an ESP32 and continuously reads audio samples. You can upload this code using the Arduino IDE and view the raw audio waveform in the Serial Plotter.

#include <driver/i2s.h>

#define I2S_WS  15
#define I2S_SD  32
#define I2S_SCK 14

const i2s_port_t I2S_PORT = I2S_NUM_0;

void setupI2S() {
  i2s_config_t i2s_config = {
    .mode = (i2s_mode_t)(I2S_MODE_MASTER | I2S_MODE_RX),
    .sample_rate = 16000,
    .bits_per_sample = I2S_BITS_PER_SAMPLE_32BIT,
    .channel_format = I2S_CHANNEL_FMT_ONLY_LEFT,
    .communication_format = I2S_COMM_FORMAT_I2S,
    .intr_alloc_flags = ESP_INTR_FLAG_LEVEL1,
    .dma_buf_count = 8,
    .dma_buf_len = 64,
    .use_apll = false,
    .tx_desc_auto_clear = false,
    .fixed_mclk = 0
  };

  i2s_pin_config_t pin_config = {
    .bck_io_num = I2S_SCK,
    .ws_io_num = I2S_WS,
    .data_out_num = I2S_PIN_NO_CHANGE,
    .data_in_num = I2S_SD
  };

  i2s_driver_install(I2S_PORT, &i2s_config, 0, NULL);
  i2s_set_pin(I2S_PORT, &pin_config);
}

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

  setupI2S();

  Serial.println("INMP441 I2S Microphone Initialized");
}

void loop() {
  int32_t sample = 0;
  size_t bytes_read = 0;

  i2s_read(
    I2S_PORT,
    &sample,
    sizeof(sample),
    &bytes_read,
    portMAX_DELAY
  );

  if (bytes_read > 0) {
    Serial.println(sample);
  }
}

1. What is the INMP441 I2S microphone used for?

The INMP441 I2S microphone is commonly used for voice capture, audio recording, voice assistants, wake-word detection, IoT devices, robotics, security systems, and other embedded audio applications. Its digital I2S interface allows compatible microcontrollers such as ESP32 boards to receive microphone data directly.

2. Can I connect the INMP441 to an ESP32?

Yes. The INMP441 is well suited for ESP32 projects because the ESP32 family supports I2S audio interfaces. Connect VDD to a suitable 3.3V supply, GND to ground, and connect SCK, WS, and SD to appropriate ESP32 GPIO pins configured for I2S input.

3. Is the INMP441 an analog or digital microphone?

The INMP441 is a digital MEMS microphone. It includes signal conditioning and analog-to-digital conversion internally and outputs audio through a 24-bit I2S interface. This allows a compatible processor to receive digital audio without requiring a separate external audio codec.

4. What voltage does the INMP441 require?

The INMP441 microphone itself supports a supply voltage in the 1.8V to 3.3V range. For typical development-board projects, 3.3V is commonly used. Always verify the electrical specifications of the particular breakout module before connecting it to a power source.

5. Does the INMP441 capture sound from all directions?

Yes. The INMP441 uses an omnidirectional MEMS microphone, so it is designed to pick up sound from different directions rather than focusing on a single direction. This makes it useful for near-field voice and general audio sensing applications.

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