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Cubitboard

cubit010·cubitboard·pcb/modular keyboard.kicad_pcb

Cubitboard PCB layout, top view — open source Nordic nRF board by cubit010
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About the Cubitboard PCB

Cubitboard is an open source Nordic nRF PCB design by cubit010, published on GitHub. It is a 4-layer board measuring 330.5 × 126.6 mm, with 204 components from 42 distinct parts.

Its main chip is the nRF52840, from the Nordic nRF family. Other key parts include the MCP1700x-300xxTT and BQ24075RGT. By type, the board carries 88 diodes, 87 switches, 17 capacitors, 4 test points, 3 ICs and 2 resistors.

It belongs with the keyboards designs in this gallery.

From the project

This project is a keyboard that has the potential to have many different modules attached, modules such as displays, a rotary encoder panel, potentiometers, or a numpad! > [!NOTE] > Most of the features can be added due to modularity, but will not be developed by me personally fo

This project is a keyboard that has the potential to have many different modules attached, modules such as displays, a rotary encoder panel, potentiometers, or a numpad! > [!NOTE] > Most of the features can be added due to modularity, but will not be developed by me personally for this project

From the back to the front (from the perspective of using the keyboard, the pins are laid out as such:

Cubitboard, from the project README
From the project README

Main components on the Cubitboard

MCP1700x-300xxTTnRF52840BQ24075RGT

Cubitboard bill of materials (BOM)

204 components, 42 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
MCP1700x-300xxTT
U2
1
nRF52840
U4
1
BQ24075RGT
U7
1
USB_C_Receptacle_USB2.0_14P
J1
1
Antenna_Shield
AE1
65
SW_Push_45deg
SW1, SW2, SW3, SW4, SW5, SW6, SW7, SW8 +57
1
RotaryEncoder_Switch
SW16
1
backsp2.0
SW30
1
Screenshot (row1)
SW31
1
tab1.5
SW32
1
\1.5
SW45
1
home
SW46
1
caps1.75
SW47
1
enter2.25
SW59
1
pgup
SW60
1
Lshift2.25
SW61
1
Rshift2.75
SW72
1
pgdn
SW74
1
Lctrl1.25
SW75
1
win1.25
SW76
Show 22 more
QtyPartRefs
1
Lalt1.25
SW77
1
Lspace2.75
SW78
1
Mspace1.25
SW79
1
Rspace2.25
SW80
1
Ralt1.25
SW81
1
Rctrl1.25
SW82
1
rFN1.25
SW83
1
end
SW87
3
TestPoint
TP1, TP2, TP3
1
GND contact
TP4
87
1N4148W
D1, D2, D3, D4, D5, D6, D7, D8 +79
1
PRTR5V0U2X
D87
1
4.7nH
L1
2
10uF
C13, C14
4
12pF
C18, C19, C31, C32
3
4.7uF
C20, C22, C29
4
1uF
C21, C25, C26, C30
1
100nF
C23
1
100pF
C24
1
0.8pF
C33
1
0.5pF
C34
2
5.1K
R1, R2

Cubitboard design files

The KiCad project lives in the cubit010/cubitboard repository on GitHub; these links point at the commit this page was built from.

Cubitboard: common questions

What microcontroller does the Cubitboard use?

The Cubitboard is built around the nRF52840, from the Nordic nRF family.

How big is the Cubitboard PCB?

The Cubitboard measures 330.5 × 126.6 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Cubitboard?

204 components, from 42 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 Cubitboard design files?

From the cubit010/cubitboard 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 Cubitboard design in my own project?

The repository has no license, so all rights stay with cubit010. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Cubitboard 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.

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