MSM261S4030H0 I2S Digital Omnidirectional Microphone Module – High-Sensitivity MEMS Acoustic Sensor for Arduino & ESP32

MSM261S4030H0 Digital I2S Omnidirectional Microphone – Ultra-Compact MEMS Acoustic Sensor Board

The I2S Omnidirectional Microphone (Model MSM261S4030H0) is a cutting-edge, low-noise, and ultra-compact digital micro-electro-mechanical system (MEMS) audio sensor rapidly replacing old analog electret mics in modern smart voice applications across India. By skipping noisy analog amplification circuitry entirely, the I2S Omnidirectional Microphone digitizes ambient sound waves directly at the hardware layer. It outputs a pristine, uncompressed 24-bit digital audio data stream via the industry-standard Inter-IC Sound ($I^2S$) bus protocol, making it an essential component for high-fidelity voice logging, edge computing AI, and sound-reactive systems.

This premium listing features a specialized circular breakout board designed for omnidirectional acoustic capture, meaning it senses sound evenly across a full 360-degree polar pattern. The module includes unpopulated yellow pin headers for breadboard prototyping and houses the sound port on its bottom face for smooth acoustic wave ingress. Build an advanced voice-activated network by matching this microphone link with our selection of Premium Audio Decoder Modules and highly stable ESP32 Development Boards at VirtualPathshala.

Why Upgrade to a Digital I2S Omnidirectional Microphone?

Standard analog electret microphone modules require complex external op-amp amplification circuits, which inject heavy power supply ripple noise and electromagnetic interference into your audio streams. The I2S Omnidirectional Microphone bypasses these analog limits entirely. Combining a high-performance acoustic transducer, an internal low-noise buffer, and an integrated sigma-delta Analog-to-Digital Converter (ADC) into a single tiny chip packet, it streams studio-grade digital audio straight to your host processor’s hardware $I^2S$ ports, maintaining exceptional signal-to-noise ratios (SNR) even over longer wire connections.

Key Features of the I2S Omnidirectional Microphone Module

1. High-Performance Digital I2S Serial Audio Protocol

The module streams clean acoustic samples over an Inter-IC Sound ($I^2S$) three-wire bus. This digital data line matches perfectly with hardware peripheral registers on advanced dual-core microcontrollers, passing uncompressed multi-bit audio samples without consuming valuable CPU overhead to run manual timing routines or software-driven ADC sampling loops.

2. 360-Degree Omnidirectional Polar Field Pattern

Unlike unidirectional directional microphones that must be aimed straight at a speaker to record sound properly, the I2S Omnidirectional Microphone exhibits a highly balanced spherical response profile. It captures human voices, machinery acoustics, and environmental background noises with uniform fidelity from any surrounding direction, making it ideal for room-wide smart assistant nodes.

3. True 24-Bit Digital Resolution Output Array

This sensor provides a massive dynamic range that easily exposes fine, subtle sound details. It packages its digital audio conversion stream using standard 24-bit data structures, which deliver exceptional signal clarity across a wide acoustic frequency response spectrum ranging from 20 Hz up to 20 kHz, covering the full extent of the human hearing range.

4. Comprehensive 3.3V Microcontroller & DSP Compatibility

Operating efficiently within modern high-speed low-voltage DC logic limits, this module connects seamlessly to advanced computing hosts without requiring active external level shifter chips:

• ✅ ESP32 / ESP32-S3 Series links – Native hardware $I^2S$ peripheral mapping with DMA (Direct Memory Access) support
• ✅ Raspberry Pi Single-Board Units – Direct ALSA digital audio capture via the 40-pin GPIO pinout
• ✅ Teensy 4.0 / 4.1 Development Platforms – Fluid integration with the advanced Teensy Audio Library extension

5. High Acoustic Overload Ceiling (140dB SPL)

The internal MEMS diaphragm element is exceptionally resilient. With a high acoustic overload point (AOP) reaching up to 140dB of Sound Pressure Level (SPL), the microphone handles sharp, clipping audio spikes—like slamming doors, machinery clatter, or sudden loud music—without fracturing the acoustic core or causing heavy audio clipping distortion.

I2S Omnidirectional Microphone – Full Technical Specifications

What Is Safely Included inside the Package

• ✅ 1× MSM261S4030H0 I2S Digital Omnidirectional MEMS Microphone Breakout Board
• ✅ 2× 3-Pin High-Quality Yellow Header Strip Sections (Unsoldered)

Frequently Asked Questions – I2S Omnidirectional Microphone

What are the functions of the 6 pins broken out on this circular module?

The module breaks its signals down into standard $I^2S$ connections: **SCK** (Serial Clock line), **WS** (Word Select / Left-Right channel clock), and **SD** (Serial Data output line). The remaining pins are **VCC** (3.3V power input), **GND** (system ground), and **L/R** (Channel Selection). Grounding the L/R pin sets the microphone to stream on the Left channel, while tying it to VCC assigns it to the Right channel for stereo configurations.

Can I connect this digital I2S microphone directly to an Arduino Uno board?

No. Standard 8-bit AVR microcontrollers like the Arduino Uno or Nano do not possess hardware $I^2S$ communication peripherals, nor do they have enough processing speed or RAM to handle a high-speed 24-bit digital audio stream. For seamless plug-and-play operation, pair this module with 32-bit controllers that feature native $I^2S$ cores, such as the ESP32 or Raspberry Pi Pico.

Why does my recorded audio file contain a low buzzing or clicking background hum?

Digital MEMS microphones are highly sensitive to electrical noise on the 3.3V power supply rail. If your host microcontroller is sharing power with a high-current device like a WiFi radio or a motor, it can introduce voltage ripples into the sensor. To isolate your audio tracks from electrical hums, add a small 0.1µF decoupling capacitor right across the module’s VCC and GND pins, and keep your data lines short.

Order Your I2S Omnidirectional Microphone Online Today

Build custom offline voice recognition modules, create high-fidelity smart home intercom networks, or add acoustic monitoring arrays to your edge computing AI projects. Supplied across all Indian states with quick, dependable domestic shipping choices from VirtualPathshala. For official hardware data books, $I^2S$ driver code examples, and ESP32 DMA buffer layouts, check our matching catalog items or contact our tech support team.