2 layers63 × 21 mm Mcu xiao nrf52840-plus, the printed circuit board in 3D

Mcu xiao nrf52840-plus

Wireless split keyboard with trackball, touch sensor and AAA battery

Size: 63 × 21 mm
Copper layers: 2
Thickness: 1.6 mm
Parts: 28
Nets: 41
Pads: 170
Tracks, vias: 553, 36
Pours: 5
Routed: Yes
KiCad: KiCad 8.0 (file 20240108)
Created: 12 Jan 2026
Updated: 12 Oct 2026

Overview

Mcu xiao nrf52840-plus is an open-source printed circuit board by cormoran, from the cormoran/dya2-keyboard repository on GitHub, published under the CC-BY-4.0 licence. It is a 2-layer board of 63 × 21 mm with 28 parts on 41 nets, routed with 553 tracks and 36 vias.

It is built around the TPS61021ADSG and H3V3SD3B. Its parts include 8 resistors, 6 connectors, 4 capacitors, 3 ICs and 2 transistors. It belongs with the keyboards and input boards and the nRF52 and nRF5x boards of this library.

Main components

README

README.md

DYA2 Split Keyboard

Hardware designs are under preparation for publish...

License

DYA logo : All rights reserved.
Other keyboard picture : CC BY
Hardware
- kicad library (./hardware/kicad_library/*) and sch (*.kicad_sch): MIT
- PCB (*.kicad_pcb): CC BY-NC
- Case data (*.stl): CC BY
Documents
- All pictures+ CC BY
- Other source codes: MIT

Category and platform

Keyboards and input nRF52 and nRF5x

Project files

Show this board on your page

https://pcbkit.io/boards/cormoran/dya2-keyboard

The board's own page, for a message or a post.

Source

Repository: cormoran/dya2-keyboard
Board file: hardware/dya-v2/mcu-xiao-nrf52840-plus/mcu-xiao-nrf52840-plus.kicad_pcb
Commit: 380f22d
Homepage: cormoran.github.io/dya2-keyboard
Licence: CC-BY-4.0

Parts

Qty	Value	Footprint	References
3	100kΩ	Resistor_SMD:R_0805_2012Metric	R2, R3, R5
3	10uF	Capacitor_SMD:C_0805_2012Metric	C2, C3, C4
2	470kΩ	Resistor_SMD:R_0805_2012Metric	R1, R7
2	Conn_01x02_Pin	Connector_JST:JST_PH_S2B-PH-K_1x02_P2.00mm_Horizontal	J1, J4
2	Q_PMOS_GSD	Package_TO_SOT_SMD:SOT-23	Q1, QL1
1	0.47uH	Inductor_SMD:L_1008_2520Metric	L1
1	150kΩ	Resistor_SMD:R_0805_2012Metric	R6
1	1MΩ	Resistor_SMD:R_0805_2012Metric	R4
1	20pF	Capacitor_SMD:C_0805_2012Metric	C1
1	330Ω	Resistor_SMD:R_0805_2012Metric	R8
1	BU42	0_dya-kbd:BU42XX	U3
1	Conn_01x01_Pin	TestPoint:TestPoint_Pad_2.0x2.0mm	J5
1	Conn_01x06_Pin	0_dya-kbd:JUSHUO-AFH34-S06FIA-1H	J3
1	Conn_01x10_Pin	Connector_PinHeader_1.27mm:PinHeader_1x10_P1.27mm_Vertical	J6
1	Conn_01x24_Pin	0_dya-kbd:HIROSE-FH34SRJ-24S-0.5SH	J2
1	H3V3SD3B	Diode_SMD:D_SOD-323	D1
1	Jumper_3_Open	Jumper:SolderJumper-3_P1.3mm_Open_RoundedPad1.0x1.5mm	JP1
1	SW_SPDT	0_dya-kbd:SSSS811101	SW_BAT1
1	TPS61021A	Package_SON:WSON-8-1EP_2x2mm_P0.5mm_EP0.9x1.6mm	U1
1	USB_C_Receptacle_USB2.0_14P	0_dya-kbd:USB_C_ Recessed_ YTC-TC16-31_1.2mm	JL3
1	XIAO-nRF52840-PLUS	0_dya-kbd:XIAO_nRF52840_plus_hybrid	U2

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59 parts

Questions

How big is the Mcu xiao nrf52840-plus PCB?

It measures 63 × 21 mm and has 2 copper layers, 1.6 mm thick.

What parts does the Mcu xiao nrf52840-plus use?

28 parts, built around the TPS61021ADSG and H3V3SD3B. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.

Where can I download the Mcu xiao nrf52840-plus KiCad files?

From the cormoran/dya2-keyboard repository on GitHub, at the commit this page was made from: the board is hardware/dya-v2/mcu-xiao-nrf52840-plus/mcu-xiao-nrf52840-plus.kicad_pcb and its schematic hardware/dya-v2/24pin-ffc-expander/mcu-xiao-nrf52840-plus.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the Mcu xiao nrf52840-plus design in my own project?

Its repository publishes it under the CC-BY-4.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).