4 open source boards using the 28 Pin ROM
Real designs built with the 28 Pin ROM, from public GitHub projects: a quick way to see how others power, decouple and connect it. Each board comes with its KiCad files, full parts list and a render — and you can simulate its firmware on HardLabs.
RP2040/RP2350Fire-28-c
piersfinlayson
18.9 × 36.6 mm46 parts2LCERN-OHL-W-2.0362
RP2040/RP2350Fire-28-d
18.9 × 36.6 mm46 parts2LCERN-OHL-W-2.0362
RP2040/RP2350Fire-28-a2
18.9 × 36.7 mm42 parts2LCERN-OHL-W-2.0362
RP2040/RP2350Fire-28-a3
18.9 × 36.7 mm42 parts2LCERN-OHL-W-2.0362
The 28 Pin ROM in open source designs
The gallery holds 4 open source boards using the 28 Pin ROM from 1 GitHub repository; a typical one measures about 18.9 × 36.6 mm and carries around 44 components.
100% are two-layer designs, the rest use four layers or more, and 100% carry an open source license.
The most starred is Fire-28-d by piersfinlayson.
Microcontrollers on boards using the 28 Pin ROM
What boards using the 28 Pin ROM are built for
28 Pin ROM: common questions
Where can I find a 28 Pin ROM reference design?
Each of the 4 boards on this page is a real design using the 28 Pin ROM. Open one to see how it is wired up, with the full BOM, a render of the layout and links to its KiCad files.
Which microcontrollers do boards using the 28 Pin ROM use?
Most are built on RP2040/RP2350 (4).
How big is a typical board using the 28 Pin ROM?
The median is 18.9 × 36.6 mm, and 100% are two-layer designs.
What is the most popular open source board using the 28 Pin ROM?
By GitHub stars, Fire-28-d by piersfinlayson, with 362 stars.
Can I simulate one of these boards using the 28 Pin ROM before building it?
Yes. HardLabs turns a board's netlist and BOM into a working simulation, so you can boot and test firmware against it with no hardware on your desk.