Adafruit Proto Under Plate PiCowBell for Pico

The Adafruit Proto Under Plate PiCowbell is a single-slot prototyping base for the Raspberry Pi Pico or Pico W. It provides a reset button, a STEMMA QT / Qwiic connector, a prototyping grid, and double-row socket headers — all with no soldering required when used with a Pico H or Pico WH.

The double-row sockets give you an extra row of pins alongside each Pico pin, so you can poke jumper wires directly in without a breadboard. The hollow socket design also allows plug-through from the back using Pico Stacking Headers. All pins are clearly labelled on the silkscreen.

Key Features

• 2×20 Double-Row Socket Headers – Pre-soldered; plug in your Pico with an extra row of sockets per pin for easy wire connections
• Reset Button – Right-angle button at the board edge for quick restarts
• STEMMA QT / Qwiic Connector – Right-angle JST SH for I2C on GPIO 4 (SDA) and GPIO 5 (SCL), with 4 extra breakout holes for re-assignment
• Prototyping Area – 3-hole connected strips in the centre (traces cuttable); duplicate hole pads next to every Pico pin for solder-jumpering
• Power Rails – Dedicated 3.3V strip and ground strip near the reset button; ground pads marked with white silkscreen
• 4 Mounting Holes – For attachment to an enclosure or underplate
• Gold-Plated Pads – For reliable soldering
• Hollow Socket Headers – Connect through the back with Pico Stacking Headers if needed

Also Consider

• Proto Doubler PiCowbell – Two-slot version with LiPo charging for Pico + one PiCowbell accessory
• Proto Tripler PiCowbell – Three-slot version with LiPo charging, EYESPI, and NeoPixel

Ideal For

• Solder-free Pico prototyping with easy pin access
• Adding I2C sensors and breakouts via STEMMA QT
• Quick breadboard-free builds and one-off projects
• Base plate for PiCowbell Doubler and Tripler setups

Package Contents

• 1× Adafruit Proto Under Plate PiCowbell (assembled with double-row socket headers, reset button, and STEMMA QT connector)