Arduino Nano ESP32 User Manual (English)

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Arduino® Nano ESP32

10 / 20 Arduino® Nano ESP32 Modiﬁed: 17/07/2023

8 Serial Communication Protocols

The ESP32-S3 chip provides ﬂexibility for the various serial protocols it supports. For example, the I2C bus can be

assigned to almost any available GPIO.

8.1 Inter-Integrated Circuit (I2C)

Default pins:

A4 - SDA

A5 - SCL

The I2C bus is by default assigned to the A4/A5 (SDA/SCL) pins for retro compatibility. This pin assignment can

however be changed, due to the ﬂexibility of the ESP32-S3 chip.

The SDA and SCL pins can be assigned to most GPIOs, however some of these pins may have other essential

functions that prevents I2C operations to run successfully.

Please note: many software libraries uses the standard pin assignment (A4/A5).

8.2 Inter-IC Sound (I2S)

There two I2S controllers that are typically used for communication with audio devices. There are no speciﬁc pins

assigned for I2S, this can be used by any free GPIO.

Using standard or TDM mode, the following lines are used:

MCLK - master clock

BCLK - bit clock

WS - word select

DIN/DOUT - serial data

Using PDM mode:

CLK - PDM clock

DIN/DOUT serial data

Read more about the I2S protocol in Espressif's Peripheral API - InterIC Sounds (I2S)

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Arduino Nano ESP32 Specifications

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