ESP32-S2-Saola-1

[中文]

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

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/contact-us/get-samples.

Wholesale Orders

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

For wholesale orders, please go to https://www.espressif.com/en/contact-us/sales-questions.

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 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.

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

Hardware Revision Details

This is the first revision of this board released.