ESP32-S2-Saola-1

[中文]

This user guide provides information on ESP32-S2-Saola-1, a small-sized ESP32-S2 based development board produced by Espressif.

ESP32-S2-Saola-1

ESP32-S2-Saola-1

The document consists of the following major sections:

  • Getting started: Provides an overview of the ESP32-S2-Saola-1 and hardware/software setup instructions to get started.

  • Hardware reference: Provides more detailed information about the ESP32-S2-Saola-1’s hardware.

  • Hardware Revision Details: Revision history, known issues, and links to user guides for previous versions (if any) of ESP32-S2-Saola-1.

  • Related Documents: Gives links to related documentation.

Getting Started

This section describes how to get started with ESP32-S2-Saola-1. It begins with a few introductory sections about the ESP32-S2-Saola-1, then Section Start Application Development provides instructions on how to get the ESP32-S2-Saola-1 ready and flash firmware into it.

Overview

ESP32-S2-Saola-1 is a small-sized ESP32-S2 based development board produced by Espressif. Most of the I/O pins are broken out to the pin headers on both sides for easy interfacing. Developers can either connect peripherals with jumper wires or mount ESP32-S2-Saola-1 on a breadboard.

To cover a wide range of users’ needs, ESP32-S2-Saola-1 supports:

In this guide, we take ESP32-S2-Saola-1 equipped with ESP32-S2-WROVER as an example.

Contents and Packaging

Retail orders

If you order a few samples, each ESP32-S2-Saola-1 comes in an individual package in either antistatic bag or any packaging depending on your retailer.

For retail orders, please go to https://www.espressif.com/en/company/contact/buy-a-sample.

Wholesale Orders

If you order in bulk, the boards come in large cardboard boxes.

For wholesale orders, please check Espressif Product Ordering Information (PDF)

Description of Components

ESP32-S2-Saola-1 - front/back

ESP32-S2-Saola-1 - front

The key components of the board are described in a clockwise direction.

Key Component

Description

ESP32-S2-WROVER

ESP32-S2-WROVER is a powerful, generic Wi-Fi MCU module that integrates ESP32-S2. It has a PCB antenna, a 4 MB external SPI flash and an additional 2 MB PSRAM.

Pin Headers

All available GPIO pins (except for the SPI bus for flash and PSRAM) are broken out to the pin headers on the board. Users can program ESP32-S2 chip to enable multiple functions such as SPI, I2S, UART, I2C, touch sensors, PWM etc.

3.3 V Power On LED

Turns on when the USB power is connected to the board.

USB-to-UART Bridge

Single USB-UART bridge chip provides transfer rates up to 3 Mbps.

Reset Button

Reset button.

Micro-USB Port

USB interface. Power supply for the board as well as the communication interface between a computer and the ESP32-S2 chip.

Boot Button

Download button. Holding down Boot and then pressing Reset initiates Firmware Download mode for downloading firmware through the serial port.

RGB LED

Addressable RGB LED (WS2812), driven by GPIO18.

Start Application Development

Before powering up your ESP32-S2-Saola-1, please make sure that it is in good condition with no obvious signs of damage.

Required Hardware

  • ESP32-S2-Saola-1

  • USB 2.0 cable (Standard-A to Micro-B)

  • Computer running Windows, Linux, or macOS

Note

Be sure to use an appropriate USB cable. Some cables are for charging only and do not provide the needed data lines nor work for programming the boards.

Software Setup

Please proceed to Get Started, where Section Installation Step by Step will quickly help you set up the development environment and then flash an application example into your ESP32-S2-Saola-1.

Note

ESP32-S2 series of chips only supports ESP-IDF master or version v4.2 and higher.

Hardware Reference

Block Diagram

A block diagram below shows the components of ESP32-S2-Saola-1 and their interconnections.

ESP32-S2-Saola-1 (click to enlarge)

ESP32-S2-Saola-1 (click to enlarge)

Power Supply Options

There are three mutually exclusive ways to provide power to the board:

  • Micro-USB port, default power supply

  • 5V and GND pin headers

  • 3V3 and GND pin headers

It is recommended to use the first option: Micro-USB Port.

Header Block

The two tables below provide the Name and Function of the pin headers on both sides of the board (J2 and J3). The pin header names are shown in ESP32-S2-Saola-1 - front. The numbering is the same as in the ESP32-S2-Saola-1 Schematics (PDF).

J2

No.

Name

Type 1

Function

1

3V3

P

3.3 V power supply

2

IO0

I/O

GPIO0, Boot

3

IO1

I/O

GPIO1, ADC1_CH0, TOUCH_CH1

4

IO2

I/O

GPIO2, ADC1_CH1, TOUCH_CH2

5

IO3

I/O

GPIO3, ADC1_CH2, TOUCH_CH3

6

IO4

I/O

GPIO4, ADC1_CH3, TOUCH_CH4

7

IO5

I/O

GPIO5, ADC1_CH4, TOUCH_CH5

8

IO6

I/O

GPIO6, ADC1_CH5, TOUCH_CH6

9

IO7

I/O

GPIO7, ADC1_CH6, TOUCH_CH7

10

IO8

I/O

GPIO8, ADC1_CH7, TOUCH_CH8

11

IO9

I/O

GPIO9, ADC1_CH8, TOUCH_CH9

12

IO10

I/O

GPIO10, ADC1_CH9, TOUCH_CH10

13

IO11

I/O

GPIO11, ADC2_CH0, TOUCH_CH11

14

IO12

I/O

GPIO12, ADC2_CH1, TOUCH_CH12

15

IO13

I/O

GPIO13, ADC2_CH2, TOUCH_CH13

16

IO14

I/O

GPIO14, ADC2_CH3, TOUCH_CH14

17

IO15

I/O

GPIO15, ADC2_CH4, XTAL_32K_P

18

IO16

I/O

GPIO16, ADC2_CH5, XTAL_32K_N

19

IO17

I/O

GPIO17, ADC2_CH6, DAC_1

20

5V0

P

5 V power supply

21

GND

G

Ground

J3

No.

Name

Type

Function

1

GND

G

Ground

2

RST

I

CHIP_PU, Reset

3

IO46

I

GPIO46

4

IO45

I/O

GPIO45

5

IO44

I/O

GPIO44, U0RXD

6

IO43

I/O

GPIO43, U0TXD

7

IO42

I/O

GPIO42, MTMS

8

IO41

I/O

GPIO41, MTDI

9

IO40

I/O

GPIO40, MTDO

10

IO39

I/O

GPIO39, MTCK

11

IO38

I/O

GPIO38

12

IO37

I/O

GPIO37

13

IO36

I/O

GPIO36

14

IO35

I/O

GPIO35

16

IO34

I/O

GPIO34

17

IO33

I/O

GPIO33

17

IO26

I/O

GPIO26

18

IO21

I/O

GPIO21

19

IO20

I/O

GPIO20, ADC2_CH9, USB_D+

20

IO19

I/O

GPIO19, ADC2_CH8, USB_D-

21

IO18

I/O

GPIO18, ADC2_CH7, DAC_2, RGB LED
1

P: Power supply; I: Input; O: Output; T: High impedance.

Pin Layout

ESP32-S2-Saola-1 (click to enlarge)

ESP32-S2 Saola-1 Pin Layout (click to enlarge)

Hardware Revision Details

This is the first revision of this board released.

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