I2S-dat

tech

DAC-dat - amplifier-audio-dat - speaker-dat
I2S-microphone-dat
speaker == I2S-DAC-dat
sensor-dat
ESP32-S3-dat

info

An I2S (Interactive Two-Way Serial) interface is a type of serial communication protocol used for transferring data between devices.

It is commonly used in computer networking, as well as in audio processing and digital electronics.

I2S interfaces typically use a combination of fast and slow data transfer rates to make efficient use of communication bandwidth and minimize noise and errors.

One of the key features of I2S interfaces is their ability to support full-duplex communication, which allows for the simultaneous transfer of data in both directions.

This makes I2S a popular choice for high-speed data transfer applications.

1. Pin Mapping Logic

To get this working, you simply need to map your microphone's pins to the ESP32’s I2S peripheral. Here is how they correspond:

Microphone Label	I2S Standard Name	ESP32 Function	Role
CLK (or BCLK)	SCK (Bit Clock)	Output	The heartbeat that times every individual bit.
L/R (or WS)	WS (Word Select)	Output	Toggles to define the start of Left/Right frames.
DATA (or SD)	SDIN (Data In)	Input	The digital audio stream entering the ESP32.

2. Why "MCLK" is Missing

If you are looking at ESP32 documentation, you might see a fourth signal called MCLK (Master Clock).

The Good News: Most I2S MEMS microphones (like the INMP441 or SPH0645) do not require an MCLK signal. They derive their internal timing directly from the Bit Clock (CLK).
The Setup: You can simply leave the MCLK configuration in your code as "unused" or -1.