Design with Microphone Module in Cirkit DesignerThe SmartElex I2S MEMS Microphone Module is a compact and efficient device designed to convert sound waves into electrical signals. This module utilizes MEMS (Micro-Electro-Mechanical Systems) technology and supports the I2S (Inter-IC Sound) protocol for digital audio data transmission. It is ideal for applications requiring high-quality audio input, such as voice recognition systems, audio recording devices, and communication systems.
This circuit consists of an Arduino Nano microcontroller connected to a KY-037 microphone module. The microphone's analog output is read by the Arduino on pin A0, allowing the Arduino to process audio signals. Power and ground connections are also established between the Arduino and the microphone module.
Open Project in Cirkit Designer
This circuit is a voice-controlled system that uses an ESP32 microcontroller to process audio input from a microphone, send the data to a Gemini API for speech-to-text conversion, and output responses through a speaker. It includes an IR sensor for additional input, an LED for status indication, and a battery with a charging module for power management.
Open Project in Cirkit Designer
This circuit is a digital voice playback and recording system powered by a 3.7V battery. It features an ESP32 microcontroller for processing, an Adafruit MAX98357A amplifier to drive a loudspeaker for audio output, and an Adafruit MAX9814 microphone amplifier for audio input. A pushbutton provides user interaction, and a 3.3V regulator ensures stable power supply to the components.
Open Project in Cirkit Designer
This circuit integrates an Arduino UNO to control a stepper motor via an A4988 driver and interfaces with a VC-02 module for audio processing. The condenser microphone captures audio signals, which are processed by the VC-02 module and output through a loudspeaker, while the Arduino also communicates with the VC-02 module and controls the stepper motor's movements.
Open Project in Cirkit DesignerThe following table outlines the key technical details of the SmartElex I2S MEMS Microphone Module:
| Parameter | Value |
|---|---|
| Manufacturer | SmartElex |
| Part ID | I2S MEMS |
| Operating Voltage | 1.8V to 3.6V |
| Current Consumption | < 1 mA |
| Output Format | I2S (Inter-IC Sound) |
| Frequency Response | 50 Hz to 20 kHz |
| Signal-to-Noise Ratio | 64 dB |
| Sensitivity | -26 dBFS ±3 dB |
| Dimensions | 15 mm x 10 mm x 2 mm |
| Operating Temperature | -40°C to +85°C |
The SmartElex I2S MEMS Microphone Module has the following pinout:
| Pin Name | Description |
|---|---|
| VDD | Power supply input (1.8V to 3.6V) |
| GND | Ground connection |
| WS | Word Select (Left/Right channel selection) |
| SCK | Serial Clock (I2S clock input) |
| SD | Serial Data (I2S audio data output) |
The Arduino UNO does not natively support I2S, but you can use an external I2S interface module or a microcontroller like the ESP32, which has built-in I2S support. Below is an example code snippet for using the I2S MEMS Microphone Module with an ESP32:
#include <driver/i2s.h>
// I2S configuration
#define I2S_NUM I2S_NUM_0 // I2S port number
#define I2S_WS_PIN 25 // Word Select pin
#define I2S_SCK_PIN 26 // Serial Clock pin
#define I2S_SD_PIN 22 // Serial Data pin
void setup() {
// Configure I2S
i2s_config_t i2s_config = {
.mode = (i2s_mode_t)(I2S_MODE_MASTER | I2S_MODE_RX), // Master mode, receive
.sample_rate = 16000, // Sampling rate
.bits_per_sample = I2S_BITS_PER_SAMPLE_16BIT, // 16-bit audio
.channel_format = I2S_CHANNEL_FMT_ONLY_LEFT, // Left channel only
.communication_format = I2S_COMM_FORMAT_I2S, // I2S format
.intr_alloc_flags = ESP_INTR_FLAG_LEVEL1, // Interrupt level
.dma_buf_count = 8, // Number of DMA buffers
.dma_buf_len = 64 // Buffer length
};
// Configure I2S pins
i2s_pin_config_t pin_config = {
.bck_io_num = I2S_SCK_PIN, // Serial Clock
.ws_io_num = I2S_WS_PIN, // Word Select
.data_out_num = I2S_PIN_NO_CHANGE, // Not used
.data_in_num = I2S_SD_PIN // Serial Data
};
// Install and start I2S driver
i2s_driver_install(I2S_NUM, &i2s_config, 0, NULL);
i2s_set_pin(I2S_NUM, &pin_config);
}
void loop() {
// Buffer to store audio data
int16_t audio_buffer[128];
size_t bytes_read;
// Read audio data from I2S
i2s_read(I2S_NUM, audio_buffer, sizeof(audio_buffer), &bytes_read, portMAX_DELAY);
// Process audio data (e.g., send to a server or analyze)
}
No Audio Output:
Distorted Audio:
Low Sensitivity:
Q: Can this module be used with a Raspberry Pi?
A: Yes, the I2S MEMS Microphone Module can be connected to a Raspberry Pi using its I2S interface. Ensure the Raspberry Pi is configured to read I2S data.
Q: What is the maximum sampling rate supported?
A: The module supports sampling rates up to 48 kHz, depending on the configuration of the I2S interface.
Q: Can I use this module for stereo audio?
A: Yes, by using two modules and configuring the WS pin appropriately, you can capture stereo audio.
Q: Is this module suitable for outdoor use?
A: The module operates in a wide temperature range (-40°C to +85°C), but it should be protected from moisture and dust for reliable operation.