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TK44

Ladniy·TK44·pcb/TK44/TK44.kicad_pcb

TK44 PCB layout, top view — open source Nordic nRF board by Ladniy
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About the TK44 PCB

TK44 is an open source Nordic nRF PCB design by Ladniy, published on GitHub under the CERN-OHL-P-2.0 license. It is a 2-layer board measuring 290 × 99.6 mm, with 116 components from 21 distinct parts.

Its main chip is the HOLYIOT-18010, from the Nordic nRF family. Other key parts include the MCP73831 and XC6220-3.3V. By type, the board carries 47 diodes, 45 switches, 8 resistors, 3 ICs, 3 connectors and 1 transistor.

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

From the project

TK44 - is a wireless unibody 40% keyboard

Wireless ergo unibody split keyboard, based on Holyiot-18010 (nRF52840) module.

Author: @ladniys (Telegram) u/Ladniy (Reddit) Layout: keyboard-layout-editor.com (actually same as Jian's) Hardware Availability: Open Source Firmware: ZMK

Check out wiki-page for more information.

The keyboard is fully functional, no problems were noticed.

This project is licensed under a CERN-OHL-P v2.0.

TK44, from the project README
From the project README

Main components on the TK44

HOLYIOT-18010MCP73831XC6220-3.3V

TK44 bill of materials (BOM)

116 components, 21 distinct parts.

QtyPartRefs
1
HOLYIOT-18010
U1
1
MCP73831
U2
1
XC6220-3.3V
U3
1
AO3407
Q1
1
BATT
J1
1
SWD
J2
1
USB_C_Receptacle_USB2.0
J3
8
Hole_Mount_M4
H1, H2, H3, H4, H5, H6, H7, H8
40
MX
SW1, SW2, SW3, SW4, SW5, SW6, SW7, SW8 +32
4
MX
SW38, SW40, SW41, SW43
1
SW_DPDT
SW45
1
SW_Push
SWT1
45
1N5819
D1, D2, D3, D4, D5, D6, D7, D8 +37
1
BLUE
D45
1
RED
D47
2
5.1K
R1, R2
2
1K
R3, R5
1
810K
R4
1
3.3K
R6
1
2M
R7
Show 1 more
QtyPartRefs
1
100K
R8

TK44 design files

The KiCad project lives in the Ladniy/TK44 repository on GitHub; these links point at the commit this page was built from.

TK44: common questions

What microcontroller does the TK44 use?

The TK44 is built around the HOLYIOT-18010, from the Nordic nRF family.

How big is the TK44 PCB?

The TK44 measures 290 × 99.6 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the TK44?

116 components, from 21 distinct parts. The full bill of materials is listed on this page.

Where can I download the TK44 design files?

From the Ladniy/TK44 repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the TK44 design in my own project?

Yes, under the terms of its CERN-OHL-P-2.0 license, which Ladniy chose for the repository.

Can I test firmware for the TK44 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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