Single-Channel I2S Microphone

A single-channel microphone is a device designed to capture audio and output it as a single-channel signal (mono). This is the most common type of microphone used in applications like speech, music recording, or public addressing systems. The ICS-43434 digital I2S output bottom port microphone. The complete ICS-43434 solution consists of a MEMS sensor, signal conditioning, an analog-to-digital converter, decimation and antialiasing filters, power management, and an industry standard 24-bit I²S interface. The I²S interface allows the ICS-43434 to connect directly to digital processors, such as DSPs and microcontrollers, without the need for an audio codec in the system. The ICS-43434 has multiple modes of operation: High Performance, Low Power (AlwaysOn) and Sleep. The ICS-43434 has high SNR and 120 db SPL AOP in all operational modes.

End of Life (EOL) Notice: The ICS43434 sensor has reached its End of Life. For more details and suggested replacements, please refer to the official TDK InvenSense Product Page.

Pin Configuration

VDD: Power supply for the microphone (1.62V to 3.63V).
GND: Ground connection.
WS: Word Select (Frame Sync) input for I²S interface.
SCK: Serial Clock input for I²S interface.
SD: Serial Data output.
L/R: Left/Right channel select. Determines whether the device outputs data on the left or right channel.

Key Features

Operating Voltage: 1.62V to 3.63V
Current Consumption (Typical): 490 µA
Sleep Current : 12uA
Acoustic Overload Point: 120 dB SPL
Signal-to-Noise Ratio (SNR): 65 dB(A)
Frequency Response: 60 Hz to 20 kHz
Sensitivity: -26 dBFS ±1 dB
Interface: I²S (Integrated Interchip Sound)
Output Format: 24-bit, two’s complement
Channel Selection: Left/Right selectable via L/R pin
Application Suitability: Optimized for voice capture and far-field audio

Application

Speech Recording: Captures clear voice signals for podcasts, interviews, or telecommunication.
Music Recording: Records instruments or vocals in studios.
Public Address Systems: Amplifies a speaker’s voice for large audiences.
Broadcasting: Used in radio and TV stations for high-quality voice capture.

Step 1: Hardware Required

Glyph Boards
Gsense 1CH Microphone

Step 2: Circuit Diagram

Step 3: Code Setup

Open Arduino IDE.
Make sure to install the “Audio Tool” library
Copy and paste the following code into the Arduino IDE:

#include "AudioTools.h"

AudioInfo info(44100, 1, 32);
I2SStream i2sStream; // Access I2S as stream
CsvOutput<int32_t> csvOutput(Serial);
StreamCopy copier(csvOutput, i2sStream); // copy i2sStream to csvOutput

// Arduino Setup
void setup(void) 
{
    Serial.begin(115200);
    AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Info);
    
    auto cfg = i2sStream.defaultConfig(RX_MODE);
    cfg.copyFrom(info);
    cfg.i2s_format = I2S_STD_FORMAT; // or try with I2S_LSB_FORMAT
    cfg.pin_ws = 22;
    cfg.pin_bck = 20;
    cfg.pin_data_rx = 21; //SD Pin
    cfg.is_master = true; 
    cfg.use_apll = false;
    i2sStream.begin(cfg);

    // make sure that we have the correct channels set up
    csvOutput.begin(info);
}

// Arduino loop - copy data
void loop() 
{
    copier.copy();
}

Step 4: Upload the Code

Connect the Board

Connect your GLYPH board to your computer

Select the Board and Port

Do the following settings in your Arduino IDE,

Tools > Board > esp32 > Pcbcupid GLYPH C6

For the Pcbcupid Glyph C3 to appear under Tools > Board > esp32, the esp32 board version installed in the Arduino IDE should be greater or equal to 3.1.0.

Tools > Port and select the port connected to your GLYPH.
Tools > USB CDC on Boot > Enabled

If USB CDC on BOOT not enabled, you won’t be seeing any serial data on Arduino IDE.

Upload the Code
- Click the upload button (➡️ icon) or use the shortcut CRTL + U in Arduino IDE to upload the code to the board.

Step 4: Observe the output

The output can be visualized in the plotter of Arduino IDE, Please check the below image for reference Output on Arduino IDE 1.x

Output on Arduino IDE 2.x

Welcome

Modules

Enclosure

Single-Channel I2S Microphone

Pin Configuration

Key Features

Application

Step 1: Hardware Required

Step 2: Circuit Diagram

Step 3: Code Setup

Step 4: Upload the Code

Step 4: Observe the output

​Pin Configuration

​Key Features

​Application

​Step 1: Hardware Required

​Step 2: Circuit Diagram

​Step 3: Code Setup

​Step 4: Upload the Code

​Step 4: Observe the output

Pin Configuration

Key Features

Application

Step 1: Hardware Required

Step 2: Circuit Diagram

Step 3: Code Setup

Step 4: Upload the Code

Step 4: Observe the output