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Orthus

Hob-dev·Orthus·KiCad/Orthus.kicad_pcb

Orthus PCB layout, top view — open source Nordic nRF board by Hob-dev
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About the Orthus PCB

Orthus is an open source Nordic nRF PCB design by Hob-dev, published on GitHub under the CC-BY-NC-4.0 license. It is a 2-layer board measuring 133.7 × 95.6 mm, with 318 components from 41 distinct parts.

Its main chip is the nRF52840_E73-2G4M08S1C, from the Nordic nRF family. Other key parts include the MAX17048, BQ24075, FS8205, SRV05-4 and DW01A. By type, the board carries 76 capacitors, 56 switches, 56 LEDs, 56 diodes, 34 resistors and 12 ICs.

It belongs with the keyboards, displays & leds and power & battery designs in this gallery.

From the project

A highly portable split keyboard focused on feeling and sound.

An ergonomic split keyboard PCB with an integrated capacitive trackpad, Sharp Memory Display, and speaker. Designed around Kailh Choc low-profile switches and styled after Nothing.

Orthus is a 6×5 ortholinear split — two mirrored halves, one with the alpha cluster (QWERT/ASDFG/ZXCV) and a number row (1–5), the other with the right-hand alphas, symbols, and a numpad row. Each half carries:

Orthus, from the project README
From the project README

Main components on the Orthus

MAX17048nRF52840_E73-2G4M08S1CBQ24075FS8205SRV05-4DW01A

Orthus bill of materials (BOM)

318 components, 41 distinct parts — part numbers from the project's BOM.

QtyPartRefs
2
MAX17048
U1, U3
2
nRF52840_E73-2G4M08S1C
U2, U8
2
BQ24075
U4, U9
2
FS8205
U5, U10
2
SRV05-4
U6, U11
2
DW01A
U7, U12
4
2N7002
Q1, Q2, Q31, Q33
2
AO3401A
Q32, Q34
2
32.768 KHz
Y1, Y2
1
TC2030_SWD
J1
2
Battery
J3, J7
1
C506791
TC2030_SWD
J4
2
Conn_01x06
J31, J32
2
HRO_TYPE-C-31-M-14
J33, J34
2
PWR
BSW1, BSW2
2
750 mA
F31, F32
2
Conn_01x07_Pin
O1, O2
2
RSW_PUSH
RSW1, RSW2
56
SW_PUSH
SW1, SW2, SW3, SW4, SW5, SW6, SW7, SW8 +48
56
WS2812_2020
LED31, LED32, LED33, LED34, LED35, LED36, LED37, LED38 +48
Show 21 more
QtyPartRefs
56
D_Small
D1, D2, D3, D4, D5, D6, D7, D8 +48
2
10 uH
L1, L3
2
BLM15PX121SN1D
L31, L32
1
C84721
100n
C1
1
C15849
100n
C2
1
C15849
12p
C3
3
12p
C4, C15, C16
2
1u
C5, C17
10
4u7
C6, C7, C8, C9, C10, C18, C19, C20 +2
58
100n
C11, C23, C31, C32, C33, C34, C35, C36 +50
1
C25804
47k
R1
1
C25804
1k5
R2
1
C25804
2k
R3
12
10k
R4, R5, R6, R16, R20, R21, R23, R28 +4
3
1k5
R7, R19, R24
6
100R
R10, R15, R27, R29, R32, R39
2
1k
R11, R31
2
100k
R17, R30
1
47k
R18
1
2k
R22
4
5k1
R35, R36, R37, R38

Orthus design files

The KiCad project lives in the Hob-dev/Orthus repository on GitHub; these links point at the commit this page was built from.

Orthus: common questions

What microcontroller does the Orthus use?

The Orthus is built around the nRF52840_E73-2G4M08S1C, from the Nordic nRF family.

How big is the Orthus PCB?

The Orthus measures 133.7 × 95.6 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Orthus?

318 components, from 41 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 Orthus design files?

From the Hob-dev/Orthus 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 Orthus design in my own project?

It is published under CC-BY-NC-4.0, which limits how it may be reused; read the license before building on it.

Can I test firmware for the Orthus 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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