0x2B: GPIO breakout Pi Top Module




The Pi Top is becoming a popular platform for software development using the Raspberry Pi singleboard computer. However, interfacing hardware to the Pi Top can be challenging, since the hub does not conform with the RPi GPIO header. This module enables easy interfacing of simple input and output devices using the native 34-way Pi Top hub. A miniature breadboard with double-sided adhesive can be mounted on top of the module for easy prototyping.


This design breaks out the conventional 40-way RPi GPIO from the 34-way Pi Top hub connector and allows HATs and other pieces of hardware to be easily interfaced to the Pi Top.

License terms
The 0x2B design is published under the Creative Commons Unported 3.0 License.  I do not profit from this design, neither should you. You are welcome to adapt, modify, and redistribute this design as long as the license terms are respected.

Physical size of PCB

84 mm (width) by 56 mm (height). Double-sided.

Rendering and photos

DipTrace 3D rendering, frontside with components


DipTrace 3D rendering, backside with components


0x2B module mounted in a Pi Top 2


Bill of materials

1 pcs. 2×20, 2.54 mm pitch (fe)male header


1 pcs. 40-way IDC connector (for connecting external boards with polarised IDC cables – recommended option)

1 pcs. 2×17, 90 degree, 2.00 mm pitch, female header

1 pcs. 2×17, 90 degree, 2.00 mm pitch, male header


Estimated cost

An IDC connector, a male angled header, and a female header should not cost more than EUR 4,-.



Schematic PDF: 0x2B_schematic

DipTrace v. 3 schematic file: 0x2B_schematic

DipTrace v. 3 PCB design file: 0x2B_ratlined_public

Gerber files: 0x2B_Gerber



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