INMP441 Overview
The INMP441 High Precision Omnidirectional Microphone Module is a compact MEMS microphone breakout designed for capturing clear, room-quality audio in digital form. Based on the INMP441 MEMS sensor, the module provides direct I2S output so you can stream audio into microcontrollers and SBCs without an external ADC. Its high SNR and broad frequency response make it well suited for voice recognition, smart speakers, AI voice applications, and general audio monitoring.
Key Benefits
- Omnidirectional 360° sound capture for even pickup across a room.
- I2S digital output eliminates the need for analog-to-digital conversion.
- High signal-to-noise ratio (~61 dBA) for clearer voice and audio detection.
- Wide frequency response (60 Hz to 15 kHz) for natural sound reproduction.
- Low power and compact size for easy integration into IoT and portable projects.
Features
- Based on INMP441 MEMS microphone sensor with on-chip ADC and digital I2S interface.
- Omnidirectional polar pattern for 360° audio pickup.
- Direct I2S digital output (LRCLK/WS, BCLK, DOUT).
- Typical SNR: ~61 dBA.
- Frequency response: 60 Hz to 15 kHz.
- Low power consumption; optimized for battery devices.
- Compact breakout footprint for embedded projects.
- Works with ESP32, Raspberry Pi, and other I2S-capable microcontrollers.
Technical Specifications
- Sensing element: INMP441 MEMS microphone
- Output: I2S digital (left/right select via LR pin if available)
- Signal-to-noise ratio: ~61 dBA
- Frequency response: 60 Hz to 15 kHz
- Supply voltage: 3.3 V (do not use 5 V)
- Power consumption: low (suitable for battery-powered applications)
Compatibility and Integration
The INMP441 omnidirectional microphone module is widely compatible with single-board computers and microcontrollers that support I2S audio input. Common supported platforms include:
- ESP32 (I2S peripheral)
- Raspberry Pi (I2S interface via GPIO)
- Other MCUs with I2S support
Typical Wiring (general reference)
Pin names vary by breakout, but the usual connections are:
- VCC -> 3.3 V (do not connect to 5 V)
- GND -> Ground
- DOUT (SD) -> I2S SD (data input pin on MCU)
- BCLK -> I2S BCLK (bit clock)
- LRCL (WS) -> I2S LRCLK or WS (word select)
Always check your breakout’s silkscreen or datasheet for exact pin labels and confirm MCU I2S pin assignments in your platform documentation.
Applications
- Voice recognition and AI assistant devices
- Smart speakers and voice-enabled IoT products
- Acoustic environment monitoring and sound detection
- Audio recording, streaming, and sound analysis
- Educational and DIY electronics projects
Getting Started
To get audio from the INMP441 to your development board, enable and configure the I2S peripheral on your MCU or SBC and map the BCLK, LRCLK/WS, and SD pins to the appropriate hardware signals. Use available I2S audio libraries and examples for ESP32 or Raspberry Pi to begin streaming and processing audio. Remember to power the module with 3.3 V only.
Why Choose the INMP441 Omnidirectional Microphone
Choose the INMP441 omnidirectional microphone module when you need a small, reliable, plug-and-play digital microphone for voice and environmental audio projects. The native I2S output simplifies audio capture pipelines, while the strong SNR and wide frequency response deliver clear results for both hobbyist and professional applications.
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