HardLabs

Ultimate keyboard

hashim-cpro·ultimate-keyboard·hardware/nrfmicro.kicad_pcb

Ultimate keyboard PCB layout, top view — open source board by hashim-cpro

About the Ultimate keyboard PCB

Ultimate keyboard is an open source PCB design by hashim-cpro, published on GitHub. It is a 2-layer board measuring 305.8 × 120.2 mm, with 273 components from 27 distinct parts.

Other key parts include the E73-2G4M08S1C, AP2112K-3.3, TP4054 and 74AHCT125. By type, the board carries 86 diodes, 85 switches, 84 LEDs, 8 resistors, 4 ICs and 3 connectors.

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

From the project

The best keyboard!

A custom 75% (84-key) mechanical keyboard built from the ground up with Bluetooth 5.0 wireless & wired USB-C connectivity, individually addressable per-key RGB backlighting, Kailh MX hot-swap sockets, and integrated LiPo battery charging.

It uses the nrfmicro microcontroller architecture as inspiration. Basically, instead of soldering a separate development board onto the keyboard, I copied the microcontroller schematics, put the Nordic nRF52840 SoC (via Ebyte E73 module) directly onto the keyboard's PCB, added battery charging and power management circuitry, and routed the entire PCB…

Ultimate keyboard, from the project README
From the project README

Main components on the Ultimate keyboard

E73-2G4M08S1CAP2112K-3.3TP405474AHCT125

Ultimate keyboard bill of materials (BOM)

273 components, 27 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
E73-2G4M08S1C
U1
1
AP2112K-3.3
U2
1
TP4054
U3
1
74AHCT125
U4
2
AO3407
Q1, Q2
1
32768kHz
X1
1
USB-C USB 2.0 MC-372
J1
1
Conn_01x04
J2
1
Conn_01x02
J3
73
SW_Push_45deg
SW1, SW2, SW3, SW4, SW5, SW6, SW7, SW8 +65
1
SW_Push_45deg
SW30
2
SW_Push_45deg
SW32, SW45
2
SW_Push_45deg
SW47, SW72
2
SW_Push_45deg
SW59, SW61
3
SW_Push_45deg
SW75, SW76, SW77
1
SW_Push_45deg
SW78
1
SW_Push
SW85
84
SK6812MINI-E
LED1, LED2, LED3, LED4, LED5, LED6, LED7, LED8 +76
84
1N4148WT
D1, D2, D3, D4, D5, D6, D7, D8 +76
1
1N5819
D100
Show 7 more
QtyPartRefs
1
RED
D200
1
100K
R1
2
5.1K
R2, R3
1
RPROG
R5
1
820K
R6
2
2M
R7, R9
1
1K
R8

Ultimate keyboard design files

The KiCad project lives in the hashim-cpro/ultimate-keyboard repository on GitHub; these links point at the commit this page was built from.

Ultimate keyboard: common questions

How big is the Ultimate keyboard PCB?

The Ultimate keyboard measures 305.8 × 120.2 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Ultimate keyboard?

273 components, from 27 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 Ultimate keyboard design files?

From the hashim-cpro/ultimate-keyboard 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 Ultimate keyboard design in my own project?

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

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