🎉
ESPBoards Store is Now Open! Find the best ESP32, ESP8266 boards & accessories
Store
ESP32-S3-Zero image

ESP32-S3-Zero

Development Board

Code name: ESP32S3_DEV
ESP32S3 ZERO

ESP32-S3-Zero is a development board based on the ESP32S3 microcontroller using XTENSA architecture.

This board features a maximum CPU frequency of 240 MHz and 4MB flash memory.

About ESP32-S3-Zero

The ESP32-S3-Zero is a compact development board featuring the Espressif ESP32-S3FH4R2 dual-core processor, operating at up to 240MHz. It offers 2.4GHz Wi-Fi (802.11 b/g/n) and Bluetooth 5 (LE) capabilities, making it ideal for IoT projects requiring robust wireless connectivity. 📶

With its small form factor of 23.5 × 18 mm, the board is designed for easy integration into space-constrained applications. The onboard ceramic antenna ensures stable wireless performance without the need for an external antenna.

For user convenience, the ESP32-S3-Zero includes both a BOOT button and a RESET button, facilitating straightforward development and debugging processes. 🚀

Equipped with 24 multifunctional GPIO pins, the board supports various interfaces, including:

  • 4 × SPI
  • 2 × I2C
  • 3 × UART
  • 2 × I2S
  • 2 × ADC

Where to Buy ESP32-S3-Zero

ESP32-S3-Zero

Starting from

$6.27 per unit

Amazon com
Amazon.com Ships worldwide
View Price
Amazon de
Amazon.de Ships to EU
View Price
Aliexpress
AliExpress Best value
View Price

Prices are subject to change. We earn from qualifying purchases as an Amazon Associate.

📋 Technical Specifications

Complete technical specification details for ESP32-S3-Zero

🛰️ Connectivity

WiFi 802.11 b/g/n (2.4 GHz)
Bluetooth 5.0
BLE 5.0

🧠 Microcontroller

Model esp32s3
Clock Speed 240 MHz
Flash Size 4MB
Architecture xtensa

✨ Features & Pins

Digital IO 24
Analog Input 2
PWM 24
Interrupts 24
  • • Ultra-compact size: 23.5 × 18 mm
  • • Low power consumption: supports various power modes for energy-efficient applications
  • • Onboard WS2812 RGB LED connected to GPIO21
Download Full Datasheet

ESP32-S3-Zero Board Dimensions

Physical measurements for ESP32-S3-Zero

ESP32-S3-Zero dimensions - height, width
Width 18.00mm
Length 23.50mm
Pin Gap 2.54mm

ESP32-S3-Zero Pinout Diagram

Complete pin reference for ESP32-S3-Zero

ESP32-S3-Zero pinout

The ESP32-S3-Zero pinout is engineered for versatility within a compact footprint. Key power pins include 5V, 3.3V, and GND, ensuring reliable power delivery for various peripherals.

The board offers multiple communication interfaces:

  • UART: TX (GPIO43), RX (GPIO44)
  • I2C: SDA, SCL
  • SPI: SCK, MISO, MOSI, SS

For analog input, it provides ADC pins suitable for reading sensor data or voltage levels.

✅ Safe Pins to Use

These pins are safe for general GPIO usage without boot or system conflicts

IO1
IO2
IO4
IO5
IO6
IO7
IO8
IO15
IO16
IO17
IO18

💡 Why Are These Pins Safe?

✓ No boot sequence involvement
✓ No flash/PSRAM connections
✓ No USB or JTAG conflicts
✓ Freely assignable without issues

⚠️ Pins to Avoid or Use with Caution

Reserved for critical functions. Misuse may cause boot failures, programming issues, or system conflicts.

🔄 Strapping Pins

Boot behavior & flash voltage

🐛 JTAG Debugging

Low-level debugging interface

🔌 USB Pins

USB Serial/JTAG communication

💾 Flash/SPI Pins

Memory & PSRAM connections

📡 UART Serial

Debugging & firmware uploads

PINLabelWhy AvoidType
IO3GPIO3Sampled at reset to select JTAG interface (USB Serial/JTAG controller vs. external pins). Improper use can disable external JTAG or alter debug interface.🛠️ Strapping
IO9FSPIHDConnected to external flash (data/hold signal) on most modules. Not recommended for use as GPIO, since it must remain dedicated to flash communication.⚡ Flash
IO10FSPICS0Used to select the external flash chip. It is required for flash access and cannot be repurposed without losing flash connectivity⚡ Flash
IO11FSPIDUsed as a data line for flash (and in-package PSRAM). It should not be used as GPIO when the flash/PSRAM is in use.⚡ Flash
IO12FSPICLKDrives the flash (and PSRAM) clock. This critical signal must be reserved for memory and not used as general GPIO.⚡ Flash

ESP32-S3-Zero Custom Pin Mapping

Pin configuration and GPIO mapping for ESP32-S3-Zero

24
Digital I/O Pins
24
Interrupt Pins
2
Analog Inputs
24
PWM Pins
PinFunctionESP PinI/O TypeDescription
15V5VPOWER INPUT5V power input for the board
2GNDGNDPOWER GROUNDGround connection
33V33.3VPOWER OUTPUT3.3V power output
5IO1IO1BIDIRECTIONALGPIO, ADC
6IO2IO2BIDIRECTIONALGPIO, ADC
7IO3IO3BIDIRECTIONALGPIO, ADC
8IO4IO4BIDIRECTIONALGPIO, ADC
9IO5IO5BIDIRECTIONALGPIO, ADC
10IO6IO6BIDIRECTIONALGPIO, ADC
11IO7IO7BIDIRECTIONALGPIO, ADC
12IO8IO8BIDIRECTIONALGPIO, ADC
13IO9IO9BIDIRECTIONALGPIO, ADC
14IO10IO10BIDIRECTIONALGPIO, ADC
15IO11IO10BIDIRECTIONALGPIO, ADC
16IO12IO10BIDIRECTIONALGPIO, ADC
17IO13IO10BIDIRECTIONALGPIO, ADC
18IO14IO10BIDIRECTIONALGPIO, ADC
19IO15IO10BIDIRECTIONALGPIO, ADC
20IO16IO10BIDIRECTIONALGPIO, ADC
21IO17IO10BIDIRECTIONALGPIO, ADC
22IO18IO10BIDIRECTIONALGPIO, ADC
23IO38IO10BIDIRECTIONALGPIO
24IO39IO10BIDIRECTIONALGPIO
25IO40IO10BIDIRECTIONALGPIO
26IO41IO10BIDIRECTIONALGPIO
27IO42IO10BIDIRECTIONALGPIO
28IO45IO10BIDIRECTIONALGPIO
Legend
Function Pin role
GPIO ESP32 pin
I/O Direction
# Pin number

Default Tools & Configuration

Build and upload settings for ESP32-S3-Zero

SettingValue
Bootloader toolesptool_py
Uploader toolesptool_py
Network uploader toolesp_ota
Bootloader address0x0
Flash modeqio
Boot modeqio
Maximum upload size
4096 KB (4194304 bytes)
Maximum data size
512 KB (524288 bytes)
Configuration Summary

The ESP32-S3-Zero uses esptool_py for uploads , esp_ota for OTA updates, and esptool_py bootloader at 0x0.

Flash mode: qio | Boot mode: qio

Max sketch size: 4096 KB | Max data size: 512 KB