HardLabs

Gnimu

c20d-us·Gnimu-PCB·boards/gnimu/gnimu-carrier-xiao-v1.1/gnimu-carrier-xiao-v1.1.kicad_pcb

Gnimu PCB layout, top view — open source Nordic nRF board by c20d-us

About the Gnimu PCB

Gnimu is an open source Nordic nRF PCB design by c20d-us, published on GitHub under the CERN-OHL-S-2.0 license. It is a 2-layer board measuring 74.8 × 44.8 mm, with 10 components from 9 distinct parts.

Its main chip is the XIAO nRF52840 Sense, from the Nordic nRF family. Other key parts include the XL63070. By type, the board carries 6 connectors, 2 ICs and 2 resistors.

It belongs with the rf & radio, power & battery and sensors designs in this gallery, and the repository also holds 1 earlier revision of it.

From the project

A small through-hole carrier for the portable, battery-powered Gnimu build. A Seeed XIAO nRF52840 Sense and an XL63070 buck-boost module solder onto it, and labelled pads take the leads for everything else. It replaces the point-to-point wiring of a hand-wired build; the connecti

A small through-hole carrier for the portable, battery-powered Gnimu build. A Seeed XIAO nRF52840 Sense and an XL63070 buck-boost module solder onto it, and labelled pads take the leads for everything else. It replaces the point-to-point wiring of a hand-wired build; the connections and the firmware are the same either way.

For the parts list, assembly steps, and usage, follow the XIAO nRF52840 build guide in the Gnimu repository.

Gnimu, from the project README
From the project README

Main components on the Gnimu

XIAO nRF52840 SenseXL63070

Gnimu bill of materials (BOM)

10 components, 9 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
XIAO nRF52840 Sense
U1
1
XL63070
U2
1
GNSS
J1
1
I2C
J2
1
GPIO
J3
1
Switch
J4
1
XIAO_BATT
J5
1
BATT
J6
2
510kΩ
R1, R2

Gnimu design files

The KiCad project lives in the c20d-us/Gnimu-PCB repository on GitHub; these links point at the commit this page was built from.

Gnimu: common questions

What microcontroller does the Gnimu use?

The Gnimu is built around the XIAO nRF52840 Sense, from the Nordic nRF family.

How big is the Gnimu PCB?

The Gnimu measures 74.8 × 44.8 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Gnimu?

10 components, from 9 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the Gnimu design files?

From the c20d-us/Gnimu-PCB repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the Gnimu design in my own project?

Yes, under the terms of its CERN-OHL-S-2.0 license, which c20d-us chose for the repository.

Can I test firmware for the Gnimu without the hardware?

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

Earlier revisions in the repo: gnimu-carrier-xiao-v1

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