HardLabs

The duplex

abushfinn-ctrl·The-duplex·PCB/splitkbd.kicad_pcb

The duplex PCB layout, top view — open source Nordic nRF board by abushfinn-ctrl

About the The duplex PCB

The duplex is an open source Nordic nRF PCB design by abushfinn-ctrl, published on GitHub. It is a 2-layer board measuring 338.3 × 129.7 mm, with 90 components from 5 distinct parts.

Its main chip is the XIAO-nRF52840-SMD, from the Nordic nRF family. By type, the board carries 42 switches, 42 diodes, 2 ICs and 2 resistors.

It belongs with the keyboards and iot & wireless designs in this gallery.

From the project

A wireless split keyboard with 42 keys, made in a 3d printed case.

The duplex, from the project README
From the project README

Main components on the The duplex

XIAO-nRF52840-SMD

The duplex bill of materials (BOM)

90 components, 5 distinct parts — part numbers from the project's BOM.

QtyPartRefs
2
XIAO-nRF52840-SMD
U1, U2
2
R
2M1, 806K1
42
SW_Push
SW1, SW2, SW3, SW4, SW5, SW6, SW7, SW8 +34
42
D
D1, D2, D3, D4, D5, D6, D7, D8 +34
2
R
R2, R4

The duplex design files

The KiCad project lives in the abushfinn-ctrl/The-duplex repository on GitHub; these links point at the commit this page was built from.

The duplex: common questions

What microcontroller does the The duplex use?

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

How big is the The duplex PCB?

The The duplex measures 338.3 × 129.7 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the The duplex?

90 components, from 5 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 The duplex design files?

From the abushfinn-ctrl/The-duplex 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 The duplex design in my own project?

The repository has no license, so all rights stay with abushfinn-ctrl. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the The duplex 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