INMP441 โมดูลไมโครโฟนรอบทิศทาง Omnidirectional Microphone Module I2S Interface MEMS

INMP441 โมดูลไมโครโฟนรอบทิศทาง Omnidirectional Microphone Module I2S Interface MEMS

INMP441 Feature:

1. The microphone module has a 24‑bit digital I2S interface with high‑ data and the output performance is stable.
2. With flat broadband frequency response and high signal‑to‑noise ratio it can produce high‑definition natural sound.
3. INMP441 is a high-performance low-power digital output omnidirectional MEMS microphone with a bottom port.
4. With MEMS sensor signal conditioning analog‑to‑digital converter anti‑aliasing filter power management and I2S interface.
5. The microphone outputs the signal on the left channel when the level is low and outputs the signal on the right channel when the level is high.


INMP441 Omnidirectional Microphone Specification:

- Item Type: Microphone Module
- Interface Definition:
- SCK: Serial data clock of I2S interface
- WS: Select serial data for I2S interface
- L/R: Left/right channel selection
- When set to low level the microphone outputs signals on the left channel
- When set to high level the microphone outputs the signal on the right channel
- SD: Serial data output from I2S interface
- VCC: Input power 1.8V-3.3V
- GND: Power supply


With flat broadband frequency response and high signal‑to‑noise ratio it can produce high‑definition natural sound.
INMP441 is a high-performance low-power digital output omnidirectional MEMS microphone with a bottom port.
The microphone module has a 24‑bit digital I2S interface with high‑ data and the output performance is stable

ตัวอย่างโค้ต INMP441

Connect to ESP32: INMP441 ESP32
SCK GPIO14
SD GPIO32
WS GPIO15
L/R GND
GND GND
VDD VDD3.3

#include driver/i2s.h

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#define I2S_WS 15

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#define I2S_SD 13

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#define I2S_SCK 2

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#define I2S_PORT I2S_NUM_0

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void setup() {

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Serial.begin(115200);

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Serial.println(Setup I2S ...);

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delay(1000);

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i2s_install();

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i2s_setpin();

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i2s_start(I2S_PORT);

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delay(500);

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}

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void loop() {

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int32_t sample = 0;

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int bytes = i2s_pop_sample(I2S_PORT (char*)sample portMAX_DELAY);

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if(bytes 0){

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Serial.println(sample);

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}

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}

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void i2s_install(){

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const i2s_config_t i2s_config = {

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.mode = i2s_mode_t(I2S_MODE_MASTER | I2S_MODE_RX)

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.sample_rate = 44100

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.bits_per_sample = i2s_bits_per_sample_t(16)

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.channel_format = I2S_CHANNEL_FMT_ONLY_LEFT

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.communication_format = i2s_comm_format_t(I2S_COMM_FORMAT_I2S | I2S_COMM_FORMAT_I2S_MSB)

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.intr_alloc_flags = 0 // default interrupt priority

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.dma_buf_count = 8

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.dma_buf_len = 64

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.use_apll = false

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};

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i2s_driver_install(I2S_PORT i2s_config 0 NULL);

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}

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void i2s_setpin(){

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const i2s_pin_config_t pin_config = {

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.bck_io_num = I2S_SCK

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.ws_io_num = I2S_WS

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.data_out_num = -1

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.data_in_num = I2S_SD

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};

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i2s_set_pin(I2S_PORT pin_config);

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}