The INMP441 MEMS Omnidirectional Microphone Module captures audio using a MEMS microphone and outputs digital I2S audio data directly, skipping the analog path entirely. The i2s microphone module runs on 3.3V at just 1.4mA and covers a frequency range of 60Hz to 15000Hz, which covers all intelligible speech and most audio monitoring needs. The I2S interface sends left and right channel data over three wires, so no ADC is needed on the host MCU.
The inmp441 module delivers a signal to noise ratio of 61 dBA and a sensitivity of 26 dBFS, which is high enough to detect whispered speech in a quiet room. A non-obvious detail is that the INMP441 has a fixed I2S format and does not support PDM mode. Some ESP-IDF examples use PDM by default, so you need to explicitly configure I2S standard mode in your firmware. Operating voltage is 3.3V only. Connecting 5V will damage the chip permanently.
voice assistant developers, and audio logging makers use the i2s microphone with ESP32 and Arduino IDE using the I2S library. StemVolt provide this omnidirectional microphone module ready to wire on a standard pin header.
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Features:
- SNR of 61 dBA gives low noise floor for clear voice and audio capture
- Sensitivity of 26 dBFS detects low-amplitude sounds including quiet speech
- Frequency response of 60Hz to 15kHz covers the full human speech range
- Current consumption of 1.4mA allows continuous audio capture on battery power
Technical specifications:
| Specification | Details |
|---|---|
| Operating Voltage | 3.3V |
| Microphone Type | INMP441 MEMS |
| S/N Ratio (dB) | 61 dBA |
| Frequency Range (Hz) | 60 to 15000 |
| High Sensitivity | 26 dBFS |
| Current Consumption (mA) | 1.4 mA |
| Microphone | Mini |
Applications:
- Voice assistant project uses INMP441 MEMS Omnidirectional Microphone Module to capture wake words over I2S
- monitor uses omnidirectional microphone to detect crying sounds from any direction equally
- Sound level monitoring station reads 61 dBA SNR audio to log ambient noise over time
- FFT spectrum analyser project reads inmp441 i2s microphone output to display live frequency data on screen
Package includes:
- 1 x INMP441 MEMS Omnidirectional Microphone Module
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