Raspberry Pi GPIO Expansion Board – 1-to-3 40-Pin GPIO Adapter

The Raspberry Pi GPIO Expansion Board is a practical accessory designed to expand a single 40-pin GPIO header into three parallel GPIO connection headers, making it easier to connect multiple electronic modules and accessories to your Raspberry Pi.

Featuring a 1-to-3 GPIO expansion design, this board provides convenient access to GPIO signals, power pins, and ground connections without requiring complex wiring.

The PCB includes clearly printed pin labels for easier identification and connection, making it suitable for electronics prototyping, robotics, educational projects, and Raspberry Pi development applications.

Key Features

• 1-to-3 GPIO Expansion: Provides three parallel GPIO connection headers from one 40-pin GPIO interface.
• 40-Pin GPIO Compatibility: Designed for Raspberry Pi boards with the standard 40-pin GPIO header.
• Clearly Labeled Pins: PCB silkscreen markings simplify GPIO identification.
• Multiple Connection Points: Allows several modules to access the same GPIO header.
• Compact PCB Design: Suitable for electronics workbenches and embedded projects.
• Mounting Holes: Supports secure installation using compatible mounting hardware.
• Passive Expansion: No programming or additional driver installation required.
• Development Friendly: Ideal for prototyping, testing, and educational electronics applications.

Technical Specifications

Raspberry Pi Compatibility

Designed for Raspberry Pi boards with a standard 40-pin GPIO header, including:

• Raspberry Pi 2 Model B
• Raspberry Pi 3 Model B / B+
• Raspberry Pi 4 Model B
• Raspberry Pi 5 (subject to mechanical clearance)
• Other compatible Raspberry Pi models with a 40-pin GPIO header

The board may also be used with selected Orange Pi and other single-board computers that have compatible 40-pin GPIO headers.

Important: GPIO pin functions and assignments can differ between board manufacturers. Always verify the pinout before connecting external modules.

Connection and Working Principle

The expansion board connects to the Raspberry Pi's GPIO header and distributes the same electrical connections across three parallel headers.

Each corresponding pin is electrically connected across the expansion headers.

For example:

This arrangement provides convenient access to the same GPIO signals from multiple connection points.

Applications

• Raspberry Pi Electronics Prototyping
• Robotics Development
• Sensor Interface Projects
• GPIO Testing and Experimentation
• Educational Electronics
• Home Automation
• Embedded Systems Development
• Raspberry Pi Hardware Expansion
• DIY Electronics Projects

Important Notes

• This is a passive GPIO expansion board, not a GPIO multiplexer or GPIO expander IC.
• The board does not increase the number of independently controllable GPIO pins.
• All three headers share the same corresponding GPIO signals.
• Avoid connecting multiple devices that drive the same GPIO line simultaneously.
• Raspberry Pi GPIO signals operate at 3.3V and are not 5V tolerant.
• The expansion board does not provide additional power capacity.
• Check the total current requirements of connected modules.
• Verify GPIO compatibility when using Orange Pi or other single-board computers.
• Check connector orientation and pin alignment before powering the system.

Package Includes

• 1 × Raspberry Pi 1-to-3 GPIO Expansion Board
• 1 × Mounting Screw Accessory Set