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Green circuit board with gold pins, 40-pin and 20-pin headers, USB connector and reset button

WaveShare

WaveShare GPIO Expander for Raspberry Pi Pico, 40PIN & 20PIN Headers

SKU CH-BG8G-SH6J2

A GPIO expander for Raspberry Pi Pico with 40PIN and 20PIN headers to connect HATs and Pico boards, plus USB power input and a reset button

  • Expands Pico GPIO with a standard 40PIN header for HATs
  • Adds a 20PIN Pico header for native expansion boards
  • USB power input feeds multiple modules reliably
  • Front-side RESET button speeds up debugging
  • Clear pinout labels and gold finish simplify wiring

Raspberry Pi Pico GPIO Expander

This board adds a standard 40PIN Raspberry Pi header and a 20PIN Pico header to a single Raspberry Pi Pico. It lets makers attach Raspberry Pi HATs and Pico expansion boards simultaneously. A USB power input supplies extra current for multiple modules. A broken-out RESET button and clear front-side pin labels speed up prototyping.

Dual Header Capacity

The 40PIN header accepts full-size Raspberry Pi HATs while the 20PIN header fits Pico-specific add-ons, giving two expansion paths on one base. USB power prevents brown-outs when several modules draw current together. Headroom ends when combined peripheral current exceeds what the USB supply can deliver or when pin functions conflict between stacked boards.

Standard Raspberry Pi 40PIN Interface

All signals route through the classic 40PIN GPIO layout, so any HAT designed for that pinout connects mechanically and electrically. The expander does not translate voltage levels or add buffering; it passes pins straight through. Builders needing level shifting, isolation or additional protocol controllers must add those circuits themselves.

How it compares

Measured against everything we stock in Single-Board Computers & Dev Kits, at today’s prices. Recalculated every night.

Price $37.99
Cheaper than about 59% of the 1,420 comparable items (median $44.99).

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Specifications

Processor
ProcessorOther

Questions about this item

Can I keep using my existing Raspberry Pi HATs with the 40PIN header on this expander?

Yes, the board includes a standard Raspberry Pi 40PIN header so current HATs plug in directly.

How do I verify the board is powered and ready after connecting the Pico and USB supply?

Connect USB power, press the breakout RESET button, and the Pico should enumerate on the host as normal.

Does the package include a Raspberry Pi Pico or male headers, or must I buy them separately?

The box contains only the expander board with the 40PIN and 20PIN headers fitted; a Pico and any male headers are separate purchases.

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