Adafruit
Adafruit GPIO Reference Card for Raspberry Pi Model B+/Pi 2/Pi 3
The Adafruit GPIO Reference Card makes it easy to identify and connect wires to the Raspberry Pi's GPIO header. This ultra-thin (0.8 mm) card slides directly...
The Adafruit GPIO Reference Card makes it easy to identify and connect wires to the Raspberry Pi's GPIO header. This ultra-thin (0.8 mm) card slides directly onto the 2×20 GPIO header, labelling each pin by function — including I²C, UART, SPI, power, and general I/O — so you can wire up your projects with confidence.
Licensed from Low Voltage Labs and updated by Adafruit with grouped pin categories, this reference card is a handy tool to keep at your workbench. Plug female jumper wires on top of the card to make connections while keeping the pin labels visible. It also makes a great keychain for Raspberry Pi enthusiasts.
Key Features
- Pin Identification at a Glance – Pins grouped by function: I²C, UART, SPI, power, and GPIO
- Ultra Thin – Only 0.8 mm thick, slides onto the header without adding bulk
- Fool-Proof Design – Can only be installed in the correct orientation
- Works with Jumper Wires – Plug female jumper wires on top of the card for easy connections
Ideal For
- Quick GPIO pin reference during prototyping
- Raspberry Pi workshops and classrooms
- Keeping pin assignments visible while wiring
Package Contents
- 1× GPIO Reference Card for Raspberry Pi Model B+/Pi 2/Pi 3
Jargon buster
Plain-language definitions for the technical terms used above.
- 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.
- 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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