I2S Output Digital Microphone - INMP441-dat
[x] - MSM261S4030H0R-dat
MSM261 S3526
MSM321 A3729H9BP
MEMS audio sensor omnidirectional digital microphone
https://www.st.com/resource/en/datasheet/mp34dt06j.pdf
Common pins
| model | L/R | WS | SD | SCK |
|---|---|---|---|---|
| explain | left/right | data-word select | DATA | clock |
| INMP441-dat | yes | yes | yes | yes |
| ICS-43434-dat | yes | yes | yes | yes |
| MSM261S4030H0R-dat | yes | yes | yes | yes |
| SPH0645-dat | yes | yes | yes | yes |
wiring reference
| Signal | Connection |
|---|---|
| SEL | unconnected (only one channel, apparently left) |
| LRCL | #15 |
| DOUT | #32 |
| BCKL | #14 |
| GND | GND |
| 3V | 3V |
go advance
- simultaneous data = microphones with TDM (Time-Division Multiplexing)
demo code for interleaved data
#include <driver/i2s.h>
// I2S configuration
#define I2S_NUM I2S_NUM_0 // I2S port number
#define SAMPLE_RATE 16000 // Sampling rate in Hz
#define I2S_BCK_PIN 26 // Bit clock pin (SCK)
#define I2S_WS_PIN 25 // Word select pin (WS/LRCLK)
#define I2S_DATA_PIN 22 // Serial data pin (SD)
#define BUFFER_SIZE 1024 // Buffer size for audio data
void setup() {
Serial.begin(115200);
// Configure I2S
i2s_config_t i2s_config = {
.mode = (i2s_mode_t)(I2S_MODE_MASTER | I2S_MODE_RX), // Master receive mode
.sample_rate = SAMPLE_RATE,
.bits_per_sample = I2S_BITS_PER_SAMPLE_32BIT, // 32-bit data
.channel_format = I2S_CHANNEL_FMT_RIGHT_LEFT, // Stereo format
.communication_format = I2S_COMM_FORMAT_I2S,
.intr_alloc_flags = ESP_INTR_FLAG_LEVEL1, // Interrupt level 1
.dma_buf_count = 4, // Number of DMA buffers
.dma_buf_len = BUFFER_SIZE // DMA buffer size
};
// Configure I2S pins
i2s_pin_config_t pin_config = {
.bck_io_num = I2S_BCK_PIN,
.ws_io_num = I2S_WS_PIN,
.data_out_num = I2S_PIN_NO_CHANGE,
.data_in_num = I2S_DATA_PIN
};
// Install and start I2S
i2s_driver_install(I2S_NUM, &i2s_config, 0, NULL);
i2s_set_pin(I2S_NUM, &pin_config);
i2s_zero_dma_buffer(I2S_NUM);
Serial.println("I2S initialized!");
}
void loop() {
int32_t i2s_buffer[BUFFER_SIZE]; // Buffer for interleaved audio data
size_t bytes_read;
// Read data from I2S
i2s_read(I2S_NUM, i2s_buffer, sizeof(i2s_buffer), &bytes_read, portMAX_DELAY);
// Process interleaved data
size_t samples_read = bytes_read / sizeof(int32_t);
for (size_t i = 0; i < samples_read; i += 2) {
int32_t left_channel = i2s_buffer[i]; // Left channel (Microphone 1)
int32_t right_channel = i2s_buffer[i+1]; // Right channel (Microphone 2)
// Print the audio data for debugging
Serial.print("Left: ");
Serial.print(left_channel);
Serial.print(" | Right: ");
Serial.println(right_channel);
}
}
Other Pick
LMD2718T261-OA1
Types
5P
ICS-43434 - 5P
8P
WMM7040DTHN0-8/TR = WMM7040DTHN0-8/TR
LGA8