INMP441 Omnidirectional Microphone Module

🗣️

Voice Recognition

Wake word detection and voice command projects

🔊

Smart Speaker Builds

DIY Alexa-style smart speakers with ESP32

🎙️

Audio Recording

Record and save audio data to SD card or cloud

📊

Sound Level Monitoring

Ambient noise detection and noise pollution logging

🤖

Robot Voice Input

Give your robot the ability to hear and respond

🎓 Beginners

Curious about adding audio input to an ESP32 project — I2S setup is simpler than analog audio processing

📚 Students

Signal processing, voice recognition thesis work, and audio IoT system university projects

⚙️ Engineers

Prototyping voice-controlled devices, noise monitoring systems or audio-enabled IoT products

🛠️ Hobbyists

Makers building DIY smart speakers, baby monitors, or voice-activated home automation systems

INMP441 → ESP32 PIN CONNECTIONS

INMP441 ESP32 I2S Read Example

#include <driver/i2s.h>
 
#define I2S_WS   15
#define I2S_SD   32
#define I2S_SCK  14
#define I2S_PORT I2S_NUM_0
#define SAMPLE_RATE 44100
 
void setup() {
  Serial.begin(115200);
  i2s_config_t config = {
    .mode = (i2s_mode_t)(I2S_MODE_MASTER | I2S_MODE_RX),
    .sample_rate = SAMPLE_RATE,
    .bits_per_sample = I2S_BITS_PER_SAMPLE_32BIT,
    .channel_format = I2S_CHANNEL_FMT_ONLY_LEFT,
    .communication_format = I2S_COMM_FORMAT_STAND_I2S,
    .intr_alloc_flags = 0,
    .dma_buf_count = 8,
    .dma_buf_len = 64,
    .use_apll = false
  };
  i2s_driver_install(I2S_PORT, &config, 0, NULL);
  i2s_pin_config_t pins = {
    .bck_io_num = I2S_SCK,
    .ws_io_num = I2S_WS,
    .data_out_num = I2S_PIN_NO_CHANGE,
    .data_in_num = I2S_SD
  };
  i2s_set_pin(I2S_PORT, &pins);
  Serial.println("✅ INMP441 I2S Ready!");
}
 
void loop() {
  int32_t sample = 0;
  size_t bytesRead;
  i2s_read(I2S_PORT, &sample, sizeof(sample), &bytesRead, 100);
  Serial.println(sample >> 14);  // Print audio level
  delay(1);
}

1 × INMP441 Omnidirectional I2S MEMS Microphone Module

Jumper wires not included