Pico HAT Hacker is a slim breakout board that gives you full access to all 40 GPIO pins on your Raspberry Pi while still letting you stack a HAT or pHAT on top. At just 0.8mm thick, it’s designed to be soldered directly onto your Pi’s GPIO header so you can easily probe signals, attach test leads, or wire up custom circuits without losing HAT compatibility.

Each pin is clearly labelled on both sides: one side uses BCM pin numbering, and the other has descriptive labels showing I2C, UART, SPI, PWM, and I2S pins, making it much easier to prototype and debug. It includes M2.5 mounting holes and is compatible with Raspberry Pi 3, 2, B+, A+, Zero, and Zero W. You’ll just need a separate 40‑pin male header to solder onto the Pico HAT Hacker (and be sparing with solder so HATs still fit cleanly on top).

This board is ideal if you frequently experiment with the GPIO header, run electronics labs or workshops, or just want a cleaner, more robust way to connect to your Pi’s pins without constantly plugging and unplugging jumper wires directly into the Pi.