HardLabs

Cweep

cjshearer·cweep

Cweep PCB layout, top view — open source Nordic nRF board by cjshearer

About the Cweep PCB

Cweep is an open source Nordic nRF PCB design by cjshearer, published on GitHub under the MIT license. It is a 2-layer board measuring 108 × 94.7 mm, with 53 components from 17 distinct parts.

Its main chip is the XIAO-nRF52840, from the Nordic nRF family. Other key parts include the BQ25504. By type, the board carries 19 switches, 17 diodes, 2 ICs, 2 connectors and 1 battery holder.

It belongs with the keyboards and power & battery designs in this gallery.

From the project

A 34 key split keyboard, inspired by the Ferris Sweep and powered by the sun.

A compact, 34 key, solar powered, reversible, split keyboard.

The case is generated from cweep.py using CadQuery, with geometry extracted from user layers in cweep.kicadpcb`.

For interactive 3D viewing with live reloads:

Changes to cweep.py or cweep.kicadpcb` automatically reload in the browser.

Reproducible builds with Nix thanks to lilyinstarlight/zmk-nix:

This project is inspired by the work of many in the custom keyboard community:

Cweep, from the project README
From the project README

Main components on the Cweep

XIAO-nRF52840BQ25504

Cweep bill of materials (BOM)

53 components, 17 distinct parts.

QtyPartRefs
1
XIAO-nRF52840
U1
1
BQ25504
U2
2
24AWG Hole
J1, J2
1
ICR10440
BT1
2
10nF
CBYP1, CREF1
2
4.7uF
CHV1, CSTOR1
1
22uH
LBST1
1
16M
ROC1
2
3.83M
ROC2, RUV1
1
4.42M
ROV1
1
5.49M
ROV2
1
6.04M
RUV2
1
SM141K04LV
SC1
17
SW_Push
SW1, SW2, SW3, SW4, SW5, SW6, SW7, SW8 +9
1
SW_SPST
SW18
1
SW_Omron_B3FS
SW19
17
1N4148W
D1, D2, D3, D4, D5, D6, D7, D8 +9

Cweep design files

The KiCad project lives in the cjshearer/cweep repository on GitHub; these links point at the commit this page was built from.

Cweep: common questions

What microcontroller does the Cweep use?

The Cweep is built around the XIAO-nRF52840, from the Nordic nRF family.

How big is the Cweep PCB?

The Cweep measures 108 × 94.7 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Cweep?

53 components, from 17 distinct parts. The full bill of materials is listed on this page.

Where can I download the Cweep design files?

From the cjshearer/cweep repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Cweep design in my own project?

Yes, under the terms of its MIT license, which cjshearer chose for the repository.

Can I test firmware for the Cweep 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.

Similar boards