This user guide provides information on ESP32-S2-Saola-1, a small-sized ESP32-S2 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.

  • 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.


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

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

Key Component



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.

I/O Connector

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.

USB to UART Bridge

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

Boot Button

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

Reset Button

Reset button.

3.3 V Power On LED

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

Micro-USB Port

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


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

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.


ESP32-S2 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 header pins

  • 3V3 and GND header pins