OSOYOO Breakout Board for 30-Pin ESP32 & ESP8266 (Model # 2025000100)

Table of Contents

• Compatibility Notice
• 1. Overview
• 2. Features
• 3. Specification
• 4. Board Component Description
• 5. Dimensional Drawing
• 6. Important Usage Notes
• 7. Resources & Downloads
• 8. Related Links

⚠ Compatibility Notice — Please Read Before Purchase

This breakout board is compatible with most 30-pin ESP32-WROOM, ESP32-WROVER, and 30-pin ESP8266 NodeMCU development boards ONLY.

It is NOT compatible with any boards in the following ESP32 series:
• ESP32-P series (e.g. ESP32-P4)
• ESP32-S series (e.g. ESP32-S2, ESP32-S3)
• ESP32-C series (e.g. ESP32-C3, ESP32-C6)
• ESP32-H series (e.g. ESP32-H2)

Before purchasing, please verify the following about your development board:
1. Chip model — must be ESP32-WROOM, ESP32-WROVER, or ESP8266
2. Pin count — must be exactly 30 pins
3. Pin layout — must match the standard 30-pin WROOM / WROVER or ESP8266 NodeMCU pinout

Compatibility Table

1. Overview

The OSOYOO Breakout Board is a versatile and user-friendly expansion board tailored for ESP32-WROOM, ESP32-WROVER, and ESP8266 modules with 30-pin headers. It is designed for both beginners and experienced developers, suitable for educational projects, prototyping, and advanced development.

The board features two sets of 2×15-pin row connectors, supporting pin spacings of 0.9 / 1.0 / 1.1 inches (22.86 / 25.4 / 27.94 mm), accommodating most standard 30-pin modules.

A separate 38-pin variant is available for users requiring a different configuration: OSOYOO Breakout Board for 38-Pin ESP32

2. Features

• LED Status Indicators: Each GPIO port has an LED indicator displaying the high/low state of the pin. LEDs are driven by an onboard 74HC04 chip — not by the ESP32/ESP8266 GPIO directly — so GPIO functionality and current output are not affected.
• Reverse Polarity Protection: An onboard reverse power protection circuit (SI2302 N-Channel MOSFET) prevents damage if power is connected with incorrect polarity.
• Dual Power Output: Provides 5V/2A (via XL1509 DC/DC converter) and 3.3V/500mA (via LDO regulator), with automatic switching between USB and external power sources.
• Voltage Selector: A V_Selector jumper lets you choose between 3.3V and 5V for the V output pin. Default is 3.3V. Always verify this setting before connecting peripherals.
• Dual Connection Options: Both 2.54mm pitch pin headers and screw terminals are available for connecting sensors, servos, and other peripherals.
• Onboard Power Switch: A dedicated power switch allows easy control of board power without unplugging cables.
• Wide Module Compatibility: Supports pin spacings of 0.9 / 1.0 / 1.1 inches, accommodating most standard 30-pin ESP32-WROOM, ESP32-WROVER, and ESP8266 NodeMCU modules.

3. Specification

4. Board Component Description

5. Dimensional Drawing

Board dimensions: 88mm x 60mm, Weight: 45g

6. Important Usage Notes

Note 1 — Voltage Selection: Ensure the correct voltage is selected via the V_Selector jumper before connecting devices. The default output is 3.3V. Connecting 5V-only devices without adjusting the jumper, or connecting 3.3V-only devices when set to 5V, may cause permanent damage to your devices.

Note 2 — Power Supply: Do not use the DC barrel jack and the screw terminal power input simultaneously — this may damage the board. When powered via USB only, the V output pin will not supply voltage unless the jumper cap is removed from the V_Selector.

Note 3 — Assembly & Orientation: Ensure the ESP32 / ESP8266 module is correctly oriented and fully seated in the 30-pin connectors before applying power. Incorrect orientation may permanently damage both the module and the breakout board.

Note 4 — Module Sold Separately: The ESP32 / ESP8266 development board is not included. Please purchase your module separately and verify compatibility (chip model, pin count, pin layout) before ordering this breakout board.

7. Resources & Downloads

Component Datasheets

8. Related Links

• OSOYOO Breakout Board for 38-Pin ESP32 — Need a 38-pin version? See this variant.
• Official Espressif ESP32 Product Page
• Official Espressif ESP8266 Product Page
• OSOYOO Technical Support