HardLabs

Left

csun·ellipsis_split_files·pcb/v1/left.kicad_pcb

Left PCB layout, top view — open source AVR/Arduino board by csun
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About the Left PCB

Left is an open source AVR/Arduino PCB design by csun, published on GitHub under the Custom license license. It is a 2-layer board measuring 190.5 × 125.7 mm, with 72 components from 72 distinct parts.

Its main chip is the ProMicro, from the AVR/Arduino family. Other key parts include the TRRS. By type, the board carries 34 relays, 34 diodes, 2 ICs, 1 connector and 1 switch.

From the project

PCB and Plate files for the ellipsis split https://www.csun.io/2020/06/14/ellipsis-split-buildlog.html

KiCad files for the pcb in the pcb/ directory

dxf files for the plates in the plates/ directory. This includes files for the templates used to cut out the wrist rests.

The board is laid out for this specific aliexpress promicro clone. You can probably use a standard promicro, but the USB port will not be flush with the edge of the board.

The toggle switch used is the E-Switch 100SP1T2B4M6QE. TBH I'd buy a clone of this off aliexpress too and save yourself a bunch of money.

Left, from the project README
From the project README

Main components on the Left

TRRSProMicro

Left bill of materials (BOM)

72 components, 72 distinct parts.

QtyPartRefs
1
TRRS
U1
1
ProMicro
U2
1
OLED_CONN
J1
1
KEY_ESC
K1
1
KEY_1
K2
1
KEY_2
K3
1
KEY_TAB
K4
1
KEY_CAPS
K5
1
KEY_LSFT
K6
1
KEY_LCTL
K7
1
KEY_Q
K8
1
KEY_A
K9
1
KEY_Z
K10
1
KEY_LSUP
K11
1
KEY_W
K12
1
KEY_S
K13
1
KEY_X
K14
1
KEY_LALT
K15
1
KEY_3
K16
1
KEY_E
K17
Show 52 more
QtyPartRefs
1
KEY_D
K18
1
KEY_C
K19
1
KEY_TL1
K20
1
KEY_4
K21
1
KEY_R
K22
1
KEY_F
K23
1
KEY_V
K24
1
KEY_TL2
K25
1
KEY_5
K26
1
KEY_T
K27
1
KEY_G
K28
1
KEY_B
K29
1
KEY_TL3
K30
1
KEY_6
K31
1
KEY_CL1
K32
1
KEY_CL2
K33
1
KEY_CL3
K34
1
RST_SW
S1
1
D_ESC
D1
1
D_1
D2
1
D_2
D3
1
D_TAB
D4
1
D_CAPS
D5
1
D_LSFT
D6
1
D_LCTL
D7
1
D_Q
D8
1
D_A
D9
1
D_Z
D10
1
D_LSUP
D11
1
D_W
D12
1
D_S
D13
1
D_X
D14
1
D_LALT
D15
1
D_3
D16
1
D_E
D17
1
D_D
D18
1
D_C
D19
1
D_TL1
D20
1
D_4
D21
1
D_R
D22
1
D_F
D23
1
D_V
D24
1
D_TL2
D25
1
D_5
D26
1
D_T
D27
1
D_G
D28
1
D_B
D29
1
D_TL3
D30
1
D_6
D31
1
D_CL1
D32
1
D_CL2
D33
1
D_CL3
D34

Left design files

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

Left: common questions

What microcontroller does the Left use?

The Left is built around the ProMicro, from the AVR/Arduino family.

How big is the Left PCB?

The Left measures 190.5 × 125.7 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Left?

72 components, from 72 distinct parts. The full bill of materials is listed on this page.

Where can I download the Left design files?

From the csun/ellipsis_split_files repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the Left design in my own project?

It is published under Custom license, which limits how it may be reused; read the license before building on it.

Can I test firmware for the Left 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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