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Raspberry Pi 40 Pin GPIO Double Expansion Board
The Raspberry Pi 40-Pin GPIO Double Expansion Board splits your Pi's single GPIO header into two, letting you connect multiple HATs, breakout boards, or acce...
The Raspberry Pi 40-Pin GPIO Double Expansion Board splits your Pi's single GPIO header into two, letting you connect multiple HATs, breakout boards, or accessories simultaneously without stacking conflicts.
Simply connect it to your Raspberry Pi's 40-pin header, and you'll have two full GPIO breakouts ready to use. All 40 pins are passed through to both headers, giving you complete access to power, ground, I2C, SPI, UART, and all GPIO pins on each side.
Key Features
- 1-to-2 GPIO Expansion – Duplicates all 40 pins across two headers
- Full Pin Pass-Through – All GPIO, power, I2C, SPI, and UART pins available on both outputs
- No Software Required – Plug-and-play hardware solution
- 40-Pin Compatible – Works with Raspberry Pi models featuring the standard 40-pin header
Ideal For
- Using multiple HATs or breakout boards at the same time
- Prototyping with breadboard access while a HAT is attached
- Testing and debugging GPIO connections
Package Contents
- 1× 40-Pin GPIO Double Expansion Board
Jargon buster
Plain-language definitions for the technical terms used above.
- breakout
- A breakout is a small circuit board that makes a tiny or hard-to-solder component easier to connect to with standard pins. It matters because this OLED module can be wired into a microcontroller project without needing to solder directly to the display’s fine contacts.
- GPIO
- General-purpose input/output pins are microcontroller pins you can set in software to read signals, switch devices on and off, or connect to peripherals. The number of GPIO pins matters because it limits how many buttons, LEDs, sensors, and other parts you can wire directly to the board.
- Headers
- Rows of metal pins used to plug a module into a breadboard or connect it with jumper wires. Pre-soldered headers make the module easier to use straight away without needing to solder the pins yourself.
- I2C
- I2C is a two-wire communication bus used by many sensors and small modules. It matters because several I2C devices can share the same two wires, but each device needs a compatible address and your controller must support I2C.
- SPI
- A fast serial communication bus often used for displays, memory cards, and sensors. It matters because SPI devices need specific pins for clock and data, plus a separate chip-select line for each device.
- UART
- UART is a simple serial connection that sends data over separate transmit and receive wires, often labelled TX and RX. It matters because this module is designed to replace a wired UART cable with a wireless link while keeping the same serial data format.
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Raspberry Pi
