HardLabs

Split-65

samlli·Split-65·pcb/split_65.kicad_pcb

Split-65 PCB layout, top view — open source AVR/Arduino board by samlli
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About the Split-65 PCB

Split-65 is an open source AVR/Arduino PCB design by samlli, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 325 × 125 mm, with 213 components from 29 distinct parts.

Its main chip is the ATMEGA32U4-AU, from the AVR/Arduino family. Other key parts include the 304050022. By type, the board carries 81 LEDs, 77 diodes, 15 resistors, 14 connectors, 14 capacitors and 4 ICs.

It belongs with the keyboards designs in this gallery.

From the project

Split staggered 65% keyboard

It aims to remain loyal to the standard ansi layout, making the split_65 second nature to use. The sturdy two part aluminum construction ensures that the keyboard will survive whatever torture is thrown at it over the years

Possible layouts are shown below - the pcb offers stepped caps lock, tsangan, and split backspace support, and users are free to mix and match layouts as needed to suit their needs.

Split-65, from the project README
From the project README

Main components on the Split-65

ATMEGA32U4-AU304050022

Split-65 bill of materials (BOM)

213 components, 29 distinct parts — part numbers from the project's BOM.

QtyPartRefs
2
ATMEGA32U4-AU
ATmega32U4-AU
U1, U3
2
304050022
PRTR5V0U2X
U2, U4
2
306010049
16MHz
Y1, Y2
2
PJ-3200B-4A
J1, J9
2
AVR-ISP-6
J2, J10
10
Breakaway_Tabs
J3, J4, J5, J6, J7, J8, J11, J12 +2
2
307010002
500mA
F1, F2
1
MXOnly-1U-NoLED
MX16
1
MXOnly-1U-NoLED
MX17
2
TYPE-C-31-M-12
HRO-TYPE-C-31-M-12
USB1, USB2
62
MXOnly-1U-NoLED
MX0, MX1, MX2, MX3, MX4, MX5, MX6, MX7 +54
4
MXOnly-1U-NoLED
MX9, MX55, MX76, MX78
3
MXOnly-1U-NoLED
MX24, MX63, MX74
7
MXOnly-1U-NoLED
MX32, MX33, MX34, MX35, MX75, MX77, MX79
2
MXOnly-1U-NoLED
MX36, MX73
1
MXOnly-1U-NoLED
MX37
1
MXOnly-1U-NoLED
MX45
1
MXOnly-1U-NoLED
MX70
75
MMSD4148T1G
SOD-123
D0, D1, D2, D3, D4, D5, D6, D7 +67
2
304020028
Schottky
D34, D76
Show 9 more
QtyPartRefs
4
302010143
22pF
C1, C2, C8, C9
2
302010139
1uF
C3, C10
6
302010138
0.1uF
C4, C5, C6, C11, C12, C13
2
302010103
10uF
C7, C14
2
301010306
4.7k
R8, R9
1
301010367
470
R18
4
301010361
10k
R24, R40, R69, R88
4
301010329
22
R38, R39, R86, R87
4
301012180
5.1k
R41, R42, R89, R90

Split-65 design files

The KiCad project lives in the samlli/Split-65 repository on GitHub; these links point at the commit this page was built from.

Split-65: common questions

What microcontroller does the Split-65 use?

The Split-65 is built around the ATMEGA32U4-AU, from the AVR/Arduino family.

How big is the Split-65 PCB?

The Split-65 measures 325 × 125 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Split-65?

213 components, from 29 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 Split-65 design files?

From the samlli/Split-65 repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.

Can I use the Split-65 design in my own project?

Yes, under the terms of its GPL-3.0 license, which samlli chose for the repository.

Can I test firmware for the Split-65 without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug AVR/Arduino firmware against it before you order a PCB.

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