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2 layers172.7 × 96.5 mmLeft Split, the printed circuit board in 3D

Left Split

shubhamp2007/Wireless-Split-Keyboard1

A ProMicro NRF52840 based Wireless Split Keyboard

Open in PCBKitView on GitHub.kicad_pcb
Size
172.7 × 96.5 mm
Copper layers
2
Thickness
1.6 mm
Parts
79
Nets
61
Pads
352
Tracks, vias
197, 23
Pours
1
Routed
Yes
KiCad
KiCad 9.0 (file 20241229)
Created
30 Jun 2026
Updated
30 Jun 2026

Overview

Left Split is an open-source printed circuit board by shubhamp2007, from the shubhamp2007/Wireless-Split-Keyboard repository on GitHub. It is a 2-layer board of 172.7 × 96.5 mm with 79 parts on 61 nets, routed with 197 tracks and 23 vias.

Its parts include 34 diodes, 34 switches and 1 IC. It belongs with the keyboards and input boards and the nRF52 and nRF5x boards of this library.

README

README.md

Wireless Split Keyboard

A 70 key wireless split keyboard powered by ProMicro NRF52840 microcontroller, using KMK firmware.

Image

Features

  • 70 Keys
  • Rotary Encoder
  • BLE support
  • Customizable software

Bill of Materials

NamePurposeQuantityTotal Cost (USD)LinkDistributor
BatteryTo power the keyboard28.50https://makerbazar.in/products/single-cell-3-7v-10000mah-lipo-battery?variant=48251044659440MakerBazar
PCBThe connect all the components.118.70https://jlcpcb.com/quoteJLCPCB
EC11 EncoderTo rotate and click10.00https://www.flyrobo.in/ec11-rotary-encoder-with-switch-digital-potentiometer-20mmFlyrobo
M2 NutsTo tighten the screws70.10https://onlyscrews.in/products/m2-nut-ss-304OnlyScrews
M2 ScrewsTo hold the body and plate together70.25https://onlyscrews.in/products/m2-x-20mm-phillips-pan-head-ss-304-screw-dia-2mm-length-20mmOnlyscrews
SwitchTo On / Off the keyboard.20.20https://probots.co.in/pcb-panel-mini-slide-switch-right-angle-3-pin-2-position-spdt-l-shape-bent.htmlProbots
StabilizersTo prevent the Keycaps to wobble when being pressed.516.80https://stackskb.com/store/durock-clear-screw-in-stabilizers-v2StacksKB
Promicro NRF52840 MicrocontrollerTo connect to the computer and sed inputs.217.20https://robokits.co.in/iot-wireless-solutions/iot-internet-of-things/iot-esp-module/supermini-nrf52840-pro-micro-bluetooth-le-ble-controller-arduino-compatibleRobokits
Hotswap SocketsTo make switching switches easy.707.40https://stackskb.com/store/gateron-hotswap-sockets/StacksKB
Keycaps SetTo stick onto the switches and give a surface to click113.75https://stackskb.com/store/veekos-gradient-keycaps-cherry-profile-135-keys/StacksKB
SwitchesTo send clicks to the microcontroller.7025.40https://stackskb.com/store/akko-v3-cream-black-pro-switch-pack-of-45/StacksKB

Schematic

Left

Schematic

Right

Schematic

PCB

PCB PCB PCB

Left

PCB PCB PCB

Right

PCB PCB PCB

Images

1 1 1 1 1

Left

1 1 1 1 1 1 1

Right

1 1 1 1 1 1 1

Parts

79
QtyValueFootprintReferences
34DScottoKeebs_Components:Diode_DO-35D1, D2, D10, D11, D12, D13, D14, D15, D16, D17, D18, D19, D20, D21, D22, D23 +18
26SW_Push_45degScottoKeebs_Hotswap:Hotswap_MX_1.00uSW1, SW2, SW10, SW11, SW12, SW13, SW14, SW15, SW17, SW18, SW19, SW20, SW21, SW22, SW24, SW25 +10
4SW_Push_45degScottoKeebs_Hotswap:Hotswap_MX_1.25uSW30, SW31, SW32, SW33
1Battery_CellConnector_JST:JST_PH_S2B-PH-K_1x02_P2.00mm_HorizontalBT1
1Nice_Nano_V2ScottoKeebs_MCU:Nice_Nano_V2U1
1SW_DIP_x01ScottoKeebs_Components:Switch_K3-1204DSWD1
1SW_Push_45degScottoKeebs_Hotswap:Hotswap_MX_1.50uSW9
1SW_Push_45degScottoKeebs_Hotswap:Hotswap_MX_2.25uSW23
1SW_Push_45degScottoKeebs_Hotswap:Hotswap_MX_1.75uSW16
1SW_Push_45degScottoKeebs_Hotswap:Hotswap_MX_2.75uSW34

The 71 most common of 79 parts.

Questions

How big is the Left Split PCB?

It measures 172.7 × 96.5 mm and has 2 copper layers, 1.6 mm thick.

What parts does the Left Split use?

79 parts. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.

Where can I download the Left Split KiCad files?

From the shubhamp2007/Wireless-Split-Keyboard repository on GitHub, at the commit this page was made from: the board is PCB/Left/Left_Split.kicad_pcb and its schematic PCB/Left/Left_Split.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the Left Split design in my own project?

Its repository states no licence, so its author keeps all rights: ask shubhamp2007 before reusing the design.

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