HardLabs

One42

cyril279·keyboards·one42/one42_pcb/one42.kicad_pcb

One42 PCB layout, top view — open source Nordic nRF board by cyril279

About the One42 PCB

One42 is an open source Nordic nRF PCB design by cyril279, published on GitHub under the MIT license. It is a 2-layer board measuring 252.3 × 111.8 mm, with 113 components from 28 distinct parts.

Its main chip is the nRF52840_holyiot_18010, from the Nordic nRF family. Other key parts include the C32574, AP2112K-3.3 and One42. By type, the board carries 46 diodes, 9 resistors, 4 ICs, 4 capacitors, 2 jumpers and 1 transistor.

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

From the project

- v2 (& v1) choc switches (soldered) - Integrated/onboard wireless controller (holyiot 18010; hello ZMK!) - 18.8mm sq.spacing (most keycap dimensions are actually 18.0-18.3mm) - 30 degree angled halves - Rotary encoders (2x optional) at outer-thumb positions ** - 100% Hand-solder

- v2 (& v1) choc switches (soldered) - Integrated/onboard wireless controller (holyiot 18010; hello ZMK!) - 18.8mm sq.spacing (most keycap dimensions are actually 18.0-18.3mm) - 30 degree angled halves - Rotary encoders (2x optional) at outer-thumb positions ** - 100% Hand-solderable - Minimally cased by Integrated switchplate, skid-plate, & component-cover

One42, from the project README
From the project README

Main components on the One42

C32574AP2112K-3.3nRF52840_holyiot_18010One42

One42 bill of materials (BOM)

113 components, 28 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
C32574
TP4054
U1
1
AP2112K-3.3
U2
1
nRF52840_holyiot_18010
U3
1
One42
U4
1
C15127
AO3401A
Q1
1
Conn_01x04_Female
J1
1
Battery_Cell
BT1
1
500ma
F1
1
EncoderPolarity
JP1
1
Reset
JP3
1
SW_SPDT
SW44
40
SW_Push
SwA00, SwA01, SwA02, SwA03, SwA04, SwA05, SwA06, SwA07 +32
2
Rotary_Encoder_Switch
SwD03, SwD08
1
HRO-TYPE-C-31-M-12
USB1
42
C81598
D_Small
D1, D2, D3, D4, D5, D6, D7, D8 +34
1
SR05
D43
1
1N5819
D44
1
powerLED
D45
1
statusLED
D46
1
C1779
4.7uF
C1
Show 8 more
QtyPartRefs
2
C28323
1uF
C2, C3
1
4.7n
C4
2
C27834
5.1k
R1, R3
2
C17414
10k
R2, R4
2
C17513
1k
R5, R7
1
C17514
1M
R6
1
806k
R8
1
C26112
2M
R9

One42 design files

The KiCad project lives in the cyril279/keyboards repository on GitHub; these links point at the commit this page was built from.

One42: common questions

What microcontroller does the One42 use?

The One42 is built around the nRF52840_holyiot_18010, from the Nordic nRF family.

How big is the One42 PCB?

The One42 measures 252.3 × 111.8 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the One42?

113 components, from 28 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 One42 design files?

From the cyril279/keyboards 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 One42 design in my own project?

Yes, under the terms of its MIT license, which cyril279 chose for the repository.

Can I test firmware for the One42 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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