Setup

Using a single INMP441 Microphone:

Wire	ESP32 Pin	INMP441 Pin
RED	3v3	VDD
WHITE	GND	GND
YELLOW	D18 (GPIO 18)	WS
GREEN	D19 (GPIO 19)	SCK
PURPLE	D23 (GPIO 23)	SD
BLUE	GND	L/R

The blue wire pulls L/R low and activates the left channel.

ESP32 Pinout

INMP441 Pinout

I2S Configuration Block

# Green Wire
bck_pin = Pin(19)

# Yellow Wire
ws_pin = Pin(18)

# Purple Wire
sdin_pin = Pin(23)

audio_in = I2S(0,
               sck=bck_pin,
               ws=ws_pin,
               sd=sdin_pin,
               mode=I2S.RX,
               bits=16,
               format=I2S.MONO,
               rate=16000,
               ibuf=16000
               )