Waveshare Pico Quad Expander - 2 x 20 GPIO breakout for Raspberry Pi Pico (WSR-19037)

The Waveshare Pico Quad Expander provides expanded GPIO access for the Raspberry Pi Pico with two 2×20 (40-pin) headers that mirror the Pico's full set of GPIO pins. Designed to simplify prototyping and wiring, this breakout board enables easy connection of sensors, actuators and peripherals while keeping the Pico accessible for development tasks. The compact PCB aligns with Pico headers and exposes all signal lines for straightforward integration into breadboard setups, custom rigs or test benches.

Advantages

The Pico Quad Expander offers a straightforward, hardware-level solution to access the Raspberry Pi Pico’s GPIO without soldering directly to the module. By duplicating the Pico pinout on two 2×20 headers, the board reduces cable clutter and provides convenient routing options for multiple external devices. Its pin-for-pin breakout preserves signal integrity and makes it easier to attach jumper wires, ribbon cables or header connectors for iterative development and debugging.

Suitable for

• Prototyping and breadboard experiments with Raspberry Pi Pico
• Connecting multiple sensors, displays and actuators simultaneously
• Development and debugging of Pico-based projects
• Educational projects and lab use where repeated wiring changes are needed

Key specifications

• Compatibility: Designed for Raspberry Pi Pico form factor and pinout
• Header format: Two 2×20 (40-pin) GPIO female/male headers mirroring Pico pins
• Signal access: Full breakout of GPIO, power and ground rails for external connections
• Mounting: Compact PCB size matching Pico header spacing for stable connection
• Connection types: Supports jumper wires, ribbon cables and standard header connectors

How to use

Place the Raspberry Pi Pico onto the expander so the module’s 2×20 pins align with the corresponding headers on the board. Secure the Pico by pressing the headers into place, then route external wiring from sensors, displays or actuators to the duplicated headers. Ensure correct orientation of power and ground lines before applying power, and verify pin assignments in your project code or wiring diagram. The expander can remain connected during programming and serial debugging using the Pico’s USB interface.

Usage recommendations

For reliable operation, connect power and ground first and double-check voltage levels for attached peripherals. Use short, well-organized jumper wires or ribbon cables to minimise noise and accidental disconnections. When working with multiple devices, label wires or use colour-coded cables to keep track of signals. For permanent installations, consider soldered header options or mounting the assembly in a housing to prevent mechanical strain on the pins.