Pins Connections

Pins

Func	Module	Description
5V	5V	Power positive (5V power input)
GND	GND	Power Ground
SDA	P2/SDA	I2C data input
SCL	P3/SCL	I2C clock Input
CLK	P18	I2S bit clock input
LRCLK	P19	I2S frame clock input
DAC	P21	I2S serial data output
ADC	P20	I2S serial data input
Button	P17	Configurable Button

Connections

I suggest to use Wire.begin(19,21); to avoid any conflicts with the I2S pins used by the AudioTools:

Func	Module	ESP32 Audio Tools
5V	5V
GND	GND	GND
SDA	GPIO 2/SDA	GPIO 19
SCL	GPIO 3/SCL	GPIO 21
CLK	GPIO 18	GPIO 14
LRCLK	GPIO 19	GPIO 15
DAC	GPIO 21	GPIO 22
ADC	GPIO 20	GPIO 32
Button	GPIO 17	-

Rasperry PI Zero Module Pins