ESP32-S3-Zero Mini Dev Board – WiFi & Bluetooth Ultra-Small

ESP32-S3-Zero Mini Development Board – Compact WiFi & Bluetooth Module

The ESP32-S3-Zero Mini Development Board is an ultra-compact, feature-rich microcontroller module powered by the ESP32-S3 chip. Combining built-in WiFi and Bluetooth connectivity in a tiny SMD form factor, this board is ideal for hobbyists, makers, and embedded developers who need serious performance in a small footprint. Whether you're prototyping IoT devices, smart home controllers, or wireless sensor nodes, the ESP32-S3-Zero delivers.

Key Features

• Ultra-Small Form Factor: Designed to fit into space-constrained projects without sacrificing connectivity or processing power.
• Dual Wireless Connectivity: Onboard WiFi and Bluetooth (BLE) for versatile wireless communication in your projects.
• Octal PSRAM Support: GPIO33–GPIO37 are internally dedicated to Octal PSRAM, expanding memory resources for demanding applications.
• WS2812 RGB LED: GPIO21 is connected to an onboard WS2812 addressable RGB LED for visual status indication or creative effects.
• USB-C Connectivity: Flashing-ready via Type-C connector — no separate USB-to-UART chip required, keeping the board slim and clean.
• Flexible Power Input: Accepts 3.7V–6V input via the castellated 5V hole for easy external power integration.
• UART0 Pins Clearly Marked: TX (GPIO43) and RX (GPIO44) are clearly silk-screened for quick and reliable serial communication setup.
• Available Pre-Soldered or Unsoldered: Choose "weld" or "not weld" to match your assembly workflow.
• Multi-Pack Options: Available in 1, 5, or 10-piece quantities — perfect for single prototypes or bulk project builds.

Hardware Notes

• When using ESP32-S3-Zero with daughterboards, avoid covering the ceramic antenna with PCB boards, metal, or plastic components to maintain optimal wireless performance.
• To flash firmware: press and hold the BOOT button (GPIO0), then connect the Type-C cable. This puts the board into download mode.
• GPIO33–GPIO37 are not exposed on the pin headers — they are used internally for Octal PSRAM.

Specifications

What's in the Box

• ESP32-S3-Zero Mini Development Board (1, 5, or 10 pcs — as selected)

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Frequently Asked Questions

Q: What makes the ESP32-S3-Zero Mini Development Board different from standard ESP32 boards?

A: The ESP32-S3-Zero is an ultra-small SMD form-factor development board that integrates WiFi and Bluetooth on the ESP32-S3 chip. Unlike many standard boards, it includes Octal PSRAM (via GPIO33–GPIO37), an onboard WS2812 RGB LED, and uses a direct USB-C connection for firmware flashing — no USB-to-UART bridge chip needed, making it exceptionally compact.

Q: How do I flash firmware onto the ESP32-S3-Zero?

A: To enter download/flash mode, press and hold the BOOT button (GPIO0) before connecting the Type-C USB cable to your computer. Once connected, you can use your preferred flashing tool (such as esptool.py or the Arduino IDE) to upload firmware. Release the BOOT button after the connection is established.

Q: Can I power the ESP32-S3-Zero from an external battery?

A: Yes. The board accepts 3.7V to 6V input through the castellated hole marked with a 5V silkscreen, making it compatible with single-cell LiPo batteries and other external power sources for standalone or portable projects.

Q: Is the ceramic antenna affected by mounting on a daughterboard?

A: Yes — for best wireless performance, ensure that the ceramic antenna area is not covered by PCB boards, metal components, or plastic enclosures when integrating the ESP32-S3-Zero into a larger assembly. Covering the antenna can significantly reduce WiFi and Bluetooth range.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.