I2S-dat

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.

I2S-microphone-dat

Name	default ESP32	also Name	func	RPI GPIO	RPI pin
SCK	26	BCLK	Serial Data Clock / Bit clock line	G18	PIN 12
WS	25	LRCK / LRC	Serial Data-Word select line	G19	PIN 35
SD	22	SDIN / SDOUT	At least one multiplexed data line	G21	PIN 40

I2S Circuit:

Arduino/Genuino Zero, MKR family and Nano 33 IoT
MAX08357:
- GND connected GND
- VIN connected 5V
- LRC connected to pin 0 (Zero) or 3 (MKR), A2 (Nano) or 25 (ESP32)
- BCLK connected to pin 1 (Zero) or 2 (MKR), A3 (Nano) or 5 (ESP32)
- DIN connected to pin 9 (Zero) or A6 (MKR), 4 (Nano) or 26 (ESP32)

DAC Circuit:

ESP32 or ESP32-S2
Audio amplifier
- Note:
  - ESP32 has DAC on GPIO pins 25 and 26.
  - ESP32-S2 has DAC on GPIO pins 17 and 18.
Connect speaker(s) or headphones.