HardLabs

Fiducial

sardonic-labs·fiducial·examples/demo-board.kicad_sch

This repository ships a schematic but no board layout.

About the Fiducial PCB

Fiducial is an open source RP2040/RP2350 PCB design by sardonic-labs, published on GitHub under the MIT license. It is a board, with 23 components from 12 distinct parts.

Its main chip is the RP2040, from the RP2040/RP2350 family. Other key parts include the AP2112K-3.3 and W25Q16JVSS. By type, the board carries 14 capacitors, 3 ICs, 3 resistors, 1 crystal, 1 connector and 1 switch.

From the project

Turn any AI coding agent into a KiCad hardware design assistant - instruction library + stdlib-only verification tools that catch what ERC misses

A complete worked example: one tiny board plus the two CSVs that audit it. Everything here matches tests/fixtures/, so CI keeps these honest.

Every row in both CSVs was derived from the board's actual netlist, so all checks pass as shipped. To see failures, change the schematic — or swap any expected net in intent.csv and watch the audit catch it.

With KiCad 8+ installed (kicad-cli on PATH):

Main components on the Fiducial

RP2040AP2112K-3.3W25Q16JVSS

Fiducial bill of materials (BOM)

23 components, 12 distinct parts.

QtyPartRefs
1
RP2040
U1
1
AP2112K-3.3
U2
1
W25Q16JVSS
U3
1
12 MHz
Y1
1
USB_C_Receptacle_USB2.0_16P
J1
1
BOOTSEL
SW1
2
10uF
C1, C2
2
15pF
C3, C4
6
100nF
C5, C6, C7, C8, C9, C14
4
1uF
C10, C11, C12, C13
2
5.1k
R1, R2
1
10k
R3

Fiducial design files

The KiCad project lives in the sardonic-labs/fiducial repository on GitHub; these links point at the commit this page was built from.

Fiducial: common questions

What microcontroller does the Fiducial use?

The Fiducial is built around the RP2040, from the RP2040/RP2350 family.

How many components are on the Fiducial?

23 components, from 12 distinct parts. The full bill of materials is listed on this page.

Where can I download the Fiducial design files?

From the sardonic-labs/fiducial repository on GitHub, which has the schematic; the links under Design files point to each one.

Can I use the Fiducial design in my own project?

Yes, under the terms of its MIT license, which sardonic-labs chose for the repository.

Can I test firmware for the Fiducial without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug RP2040/RP2350 firmware against it before you order a PCB.

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