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README.md | ||
streams-i2s-webserver_wav.ino |
I2S to Webserver
This sketch reads sound data from I2S. The result is provided as WAV stream which can be listened to in a Web Browser
The INMP441 is a high-performance, low power, digital-output, omnidirectional MEMS microphone with a bottom port. The complete INMP441 solution consists of a MEMS sensor, signal conditioning, an analog-to-digital converter, anti-aliasing filters, power management, and an industry-standard 24-bit I²S interface. The I²S interface allows the INMP441 to connect directly to digital processors, such as DSPs and microcontrollers, without the need for an audio codec in the system.
Pins
INMP441 | ESP32 |
---|---|
VDD | 3.3 |
GND | GND |
SD | IN (GPIO32) |
L/R | GND |
WS | WS (GPIO15) |
SCK | BCK (GPIO14) |
- SCK: Serial data clock for I²S interface
- WS: Select serial data words for the I²S interface
- L/R: Left / right channel selection When set to low, the microphone emits signals on the left channel of the I²S frame. When the high level is set, the microphone will send signals on the right channel.
- ExSD: Serial data output of the I²S interface
- VCC: input power 1.8V to 3.3V
- GND: Power groundHigh PSR: -75 dBFS.