INMP441 I2S 24-bit omnidirectional microphone module
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The product is intended for specialists and requires qualified and authorized personnel. The product does not include assembly/use instructions . Putting the product into operation by unqualified persons leads to the loss of the warranty according to the Terms and Conditions on the site.

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Digital Microphone Module, INMP441 Compatible, I2S, Omnidirectional, 24-bit, 3.3V

Omnidirectional MEMS module with I2S output, ideal for audio projects with ESP32 and other microcontrollers, without a separate codec. Delivers 24-bit data for clear capture of voice and ambient sounds, has good signal-to-noise ratio and low power consumption. Operates at 1.8-3.3V , and left/right channel selection is made simply by the L/R pin.

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This product has a warranty of 2 years.

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The INMP441 Digital Microphone Module is an omnidirectional MEMS module with I2S output, designed for audio projects with ESP32 and other microcontrollers, without the need for a separate audio codec.

It provides clear voice and ambient sound capture thanks to its wide frequency response and good signal-to-noise ratio, making it suitable for recording applications, voice commands, sound detection, or small conference systems.

The module delivers 24-bit audio data through the I2S interface, has low power consumption, and operates stably at power supplies from 1.8V to 3.3V, with left-right channel selection easily done via the L R pin.

The module is available both in Original and Compatible versions (cheaper). This product is COMPATIBLE, with lower performance compared to the original module.

 

Specifications:

Supply Voltage: 1.8V - 3.3V

Model: INMP441, COMPATIBLE

Microphone type: Omnidirectional MEMS with bottom port

Interface: I2S 24-bit

Signal-to-noise ratio: 61 dBA

Sensitivity: -26 dBFS

Frequency response: 60 Hz to 15 kHz

Current consumption: 1.4 mA

PSR: -75 dBFS

I2S pins: SCK, WS, SD

Channel selection: L R

Dimensions mm (diameter): 14mm 

 

Pinout:

INMP441 Pin Role ESP32 (example)
VDD Power supply 1.8V to 3.3V 3V3
GND Ground GND
SCK I2S clock BCLK GPIO14
WS I2S word select LRCLK GPIO15
SD I2S data out GPIO32
L/R Channel selection GND for Left or 3V3 for Right

 

Usage:

Connect the module to the ESP32 as follows

SCK to GPIO14

SD to GPIO32

WS to GPIO15

L R to GND for left channel or to VDD for right channel

GND to GND

VDD to 3.3V

 

Mount a 100nF decoupling capacitor as close as possible to the VDD pin for stability and noise reduction on the power supply.

For good results, keep the I2S wires as short as possible and avoid routing them near interference sources such as step-up converters, motors, or power cables.

If the application is in a noisy environment, use software filtering and noise reduction algorithms, because an omnidirectional microphone captures sound from all directions and may pick up more ambient noise than a directional microphone.

Secure the module so that the microphone port is not covered and has free access to air for correct sound capture.

88226

Produs destinat utilizarii in proiecte electronice, automatizari, prototipare, educatie si cercetare.

Produsul trebuie utilizat numai conform specificatiilor tehnice mentionate in descriere si/sau in documentatia produsului.

Avertismente generale de siguranta:

Nu utilizati produsul la tensiuni, curenti sau temperaturi peste valorile specificate.

Montajul si conectarea trebuie realizate de persoane cu cunostinte tehnice minime in domeniul electric/electronic.

Evitati scurtcircuitele, inversarea polaritatii si conectarea gresita a alimentarii.

Nu lasati produsul alimentat nesupravegheat in timpul testelor.

Produsul nu este jucarie si nu este destinat copiilor.

Pentru modulele electronice, se recomanda utilizarea in carcase, panouri sau montaje protejate, dupa caz.

Identificare produs:

Denumirea produsului, codul/SKU-ul si caracteristicile tehnice sunt mentionate in pagina produsului si/sau pe eticheta ambalajului.

Producator / Importator / Distribuitor:

Sigmanortec S.R.L.

Calea Bucuresti nr. 9, Targu Jiu, Gorj, Romania

E-mail: [email protected]

Website: www.sigmanortec.ro

Persoana responsabila in UE:

Sigmanortec S.R.L.

Calea Bucuresti nr. 9, Targu Jiu, Gorj, Romania

E-mail: [email protected]

Documentatie si siguranta:

Pentru informatii suplimentare, fise tehnice, declaratii de conformitate sau instructiuni, ne puteti contacta la [email protected].

ESP Example Code:

#include <Arduino.h>

#include "driver/i2s.h"

// INMP441 - ESP32 connection

// SCK(BCLK) - GPIO14

// WS(LRCLK) - GPIO15

// SD(DOUT)  - GPIO32

// L/R       - GND (Left) or 3V3 (Right)

static const i2s_port_t I2S_PORT = I2S_NUM_0;

#define I2S_BCLK   14

#define I2S_LRCLK  15

#define I2S_DOUT   32

// Audio settings

#define SAMPLE_RATE     16000

#define I2S_READ_LEN    1024   // bytes per read

void setupI2S()

{

  i2s_config_t i2s_config = {

    .mode = (i2s_mode_t)(I2S_MODE_MASTER | I2S_MODE_RX),

    .sample_rate = SAMPLE_RATE,

    .bits_per_sample = I2S_BITS_PER_SAMPLE_32BIT,   // INMP441 outputs 24 bits in a 32-bit frame

    .channel_format = I2S_CHANNEL_FMT_ONLY_LEFT,    // if L/R is connected to GND

    .communication_format = I2S_COMM_FORMAT_I2S,

    .intr_alloc_flags = ESP_INTR_FLAG_LEVEL1,

    .dma_buf_count = 8,

    .dma_buf_len = 256,

    .use_apll = false,

    .tx_desc_auto_clear = false,

    .fixed_mclk = 0

  };

  i2s_pin_config_t pin_config = {

    .bck_io_num = I2S_BCLK,

    .ws_io_num = I2S_LRCLK,

    .data_out_num = I2S_PIN_NO_CHANGE,

    .data_in_num = I2S_DOUT

  };

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

  i2s_set_pin(I2S_PORT, &pin_config);

  i2s_zero_dma_buffer(I2S_PORT);

}

void setup()

{

  Serial.begin(115200);

  delay(200);

  setupI2S();

  Serial.println("INMP441 I2S start. Reading and displaying signal level");

}

void loop()

{

  uint8_t i2sData[I2S_READ_LEN];

  size_t bytesRead = 0;

  esp_err_t result = i2s_read(I2S_PORT, i2sData, I2S_READ_LEN, &bytesRead, portMAX_DELAY);

  if (result != ESP_OK || bytesRead == 0) return;

  // Convert a few samples for a simple level measurement (peak)

  int32_t peak = 0;

  // Data is 32-bit little-endian, useful data is 24 bits

  for (int i = 0; i < (int)bytesRead; i += 4) {

    int32_t sample = (int32_t)(

      ((uint32_t)i2sData[i]) |

      ((uint32_t)i2sData[i + 1] << 8) |

      ((uint32_t)i2sData[i + 2] << 16) |

      ((uint32_t)i2sData[i + 3] << 24)

    );

    // Sometimes a shift is needed to align the 24-bit sample

    sample >>= 8;

    int32_t absS = sample < 0 ? -sample : sample;

    if (absS > peak) peak = absS;

  }

  Serial.print("Peak: ");

  Serial.println(peak);

  delay(50);

}

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