2 layers140.5 × 119.1 mm
2 layers185.7 × 119.1 mm
J2J PCB R
asumo-1xts/J2J1Just the Two of JIS - My ideal split keyboard
- Size
- 185.7 × 119.1 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 205
- Nets
- 144
- Pads
- 714
- Tracks, vias
- 1,257, 536
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 16 May 2026
- Updated
- 11 Aug 2026
Overview
J2J PCB R is an open-source printed circuit board by asumo-1xts, from the asumo-1xts/J2J repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 185.7 × 119.1 mm with 205 parts on 144 nets, routed with 1,257 tracks and 536 vias.
It is built around the ATMEGA32U4-MU, 1N4148W and SK6812MINI-E. Its parts include 104 diodes, 51 switches, 9 resistors, 8 capacitors and 2 connectors. It belongs with the keyboards and input boards and the AVR (ATmega, ATtiny) boards of this library.
Main components
3
ATMEGA32U4-MU
VQFN-44-EP(7x7)-40℃~+85℃ 10bit 16MHz 1KB 2.5KB 2.7V~5.5V 26 32KB 8 Bit AVR Built-in FLASH VQFN-44-EP(7x7) Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)
1N4148W
SOD-123150mA 1A 1V@50mA 1uA@75V 400mW 4ns 75V Independent SOD-123 Switching Diodes ROHSSTMicroelectronicsSwitching Diodes
SK6812MINI-E
SMD-40℃~+85℃ 0.6mA 1.78mm 120mcd~240mcd 120° 160mcd~320mcd 1kHz 2.8mm 2000V 3.2mm 3.7V~5.5V 460nm~470nm 515nm~525nm 620nm~625nm 800Kbit/s 815mcd~1275mcd Semi-transparent lens SMD RGB LEDs(Built-in IC) ROHSOPSCO OptoelectronicsRGB LEDs(Built-In IC)
Parts
205| Qty | Value | Footprint | References |
|---|---|---|---|
| 50 | 1N4148W | Diode_SMD:D_SOD-323 | D2, D10, D11, D12, D13, D14, D15, D16, D17, D18, D19, D21, D22, D23, D24, D25 +34 |
| 50 | SK6812MINI-E | LED_SMD:LED_SK6812MINI-E_3.2x2.8mm_P1.5mm_ReverseMount | D55, D56, D57, D58, D59, D60, D61, D62, D63, D64, D65, D100, D101, D102, D103, D104 +34 |
| 3 | 104 | Capacitor_SMD:C_0402_1005Metric | C3, C4, C7 |
| 3 | 470 | Resistor_SMD:R_0402_1005Metric | R7, R8, R9 |
| 3 | LED | LED_SMD:LED_0402_1005Metric | D20, D30, D39 |
| 3 | LOGO | LOGO | G***, G***, G*** |
| 2 | 105 | Capacitor_SMD:C_0402_1005Metric | C2, C8 |
| 2 | 22 | Resistor_SMD:R_0402_1005Metric | R4, R5 |
| 2 | 22pF | Capacitor_SMD:C_0402_1005Metric | C5, C6 |
| 2 | 5k1 | Resistor_SMD:R_0603_1608Metric | R1, R2 |
| 1 | ' | PCM_Switch_Keyboard_Hotswap_Kailh:SW_Hotswap_Kailh_Choc_V2_1.00u | SW34 |
| 1 | , | PCM_Switch_Keyboard_Hotswap_Kailh:SW_Hotswap_Kailh_Choc_V2_1.00u | SW39 |
| 1 | - | PCM_Switch_Keyboard_Hotswap_Kailh:SW_Hotswap_Kailh_Choc_V2_1.00u | SW14 |
| 1 | . | PCM_Switch_Keyboard_Hotswap_Kailh:SW_Hotswap_Kailh_Choc_V2_1.00u | SW40 |
| 1 | / | PCM_Switch_Keyboard_Hotswap_Kailh:SW_Hotswap_Kailh_Choc_V2_1.00u | SW41 |
| 1 | 0 | PCM_Switch_Keyboard_Hotswap_Kailh:SW_Hotswap_Kailh_Choc_V2_1.00u | SW13 |
| 1 | 10k | Resistor_SMD:R_0603_1608Metric | R6 |
| 1 | 10uF | Capacitor_SMD:C_0603_1608Metric | C1 |
| 1 | 16MHz | Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm | Y1 |
| 1 | 470 | Resistor_SMD:R_0603_1608Metric | R3 |
| 1 | 7 | PCM_Switch_Keyboard_Hotswap_Kailh:SW_Hotswap_Kailh_Choc_V2_1.00u | SW10 |
| 1 | 8 | PCM_Switch_Keyboard_Hotswap_Kailh:SW_Hotswap_Kailh_Choc_V2_1.00u | SW11 |
| 1 | 9 | PCM_Switch_Keyboard_Hotswap_Kailh:SW_Hotswap_Kailh_Choc_V2_1.00u | SW12 |
| 1 | ; | PCM_Switch_Keyboard_Hotswap_Kailh:SW_Hotswap_Kailh_Choc_V2_1.00u | SW33 |
| 1 | = | PCM_Switch_Keyboard_Hotswap_Kailh:SW_Hotswap_Kailh_Choc_V2_1.00u | SW15 |
| 1 | ATmega32U4-M | Package_DFN_QFN:QFN-44-1EP_7x7mm_P0.5mm_EP5.2x5.2mm | U1 |
| 1 | AudioJack3_SwitchTR | Connector_Audio:Jack_3.5mm_PJ320D_Horizontal | J2 |
| 1 | BS | PCM_Switch_Keyboard_Hotswap_Kailh:SW_Hotswap_Kailh_Choc_V2_1.00u | SW17 |
| 1 | Down | PCM_Switch_Keyboard_Hotswap_Kailh:SW_Hotswap_Kailh_Choc_V2_1.00u | SW50 |
| 1 | End | PCM_Switch_Keyboard_Hotswap_Kailh:SW_Hotswap_Kailh_Choc_V2_1.00u | SW44 |
| 1 | Enter | PCM_Switch_Keyboard_Hotswap_Kailh:SW_Hotswap_Kailh_Choc_V2_ISOEnter_180deg | SW26 |
| 1 | F10 | PCM_Switch_Keyboard_Hotswap_Kailh:SW_Hotswap_Kailh_Choc_V2_1.00u | SW4 |
| 1 | F11 | PCM_Switch_Keyboard_Hotswap_Kailh:SW_Hotswap_Kailh_Choc_V2_1.00u | SW5 |
| 1 | F12 | PCM_Switch_Keyboard_Hotswap_Kailh:SW_Hotswap_Kailh_Choc_V2_1.00u | SW6 |
| 1 | F7 | PCM_Switch_Keyboard_Hotswap_Kailh:SW_Hotswap_Kailh_Choc_V2_1.00u | SW1 |
| 1 | F8 | PCM_Switch_Keyboard_Hotswap_Kailh:SW_Hotswap_Kailh_Choc_V2_1.00u | SW2 |
| 1 | F9 | PCM_Switch_Keyboard_Hotswap_Kailh:SW_Hotswap_Kailh_Choc_V2_1.00u | SW3 |
| 1 | Fn | PCM_Switch_Keyboard_Hotswap_Kailh:SW_Hotswap_Kailh_Choc_V2_1.25u | SW48 |
| 1 | Fuse | Fuse:Fuse_0805_2012Metric | F1 |
| 1 | H | PCM_Switch_Keyboard_Hotswap_Kailh:SW_Hotswap_Kailh_Choc_V2_1.00u | SW29 |
| 1 | Home | PCM_Switch_Keyboard_Hotswap_Kailh:SW_Hotswap_Kailh_Choc_V2_1.00u | SW36 |
| 1 | I | PCM_Switch_Keyboard_Hotswap_Kailh:SW_Hotswap_Kailh_Choc_V2_1.00u | SW21 |
| 1 | J | PCM_Switch_Keyboard_Hotswap_Kailh:SW_Hotswap_Kailh_Choc_V2_1.00u | SW30 |
| 1 | K | PCM_Switch_Keyboard_Hotswap_Kailh:SW_Hotswap_Kailh_Choc_V2_1.00u | SW31 |
| 1 | L | PCM_Switch_Keyboard_Hotswap_Kailh:SW_Hotswap_Kailh_Choc_V2_1.00u | SW32 |
| 1 | LANG2 | PCM_Switch_Keyboard_Hotswap_Kailh:SW_Hotswap_Kailh_Choc_V2_1.25u | SW46 |
| 1 | LED | LED_SMD:LED_0603_1608Metric | D1 |
| 1 | Left | PCM_Switch_Keyboard_Hotswap_Kailh:SW_Hotswap_Kailh_Choc_V2_1.00u | SW49 |
| 1 | M | PCM_Switch_Keyboard_Hotswap_Kailh:SW_Hotswap_Kailh_Choc_V2_1.00u | SW38 |
| 1 | Macro1 | PCM_Switch_Keyboard_Hotswap_Kailh:SW_Hotswap_Kailh_Choc_V2_1.00u | SW8 |
| 1 | Macro2 | PCM_Switch_Keyboard_Hotswap_Kailh:SW_Hotswap_Kailh_Choc_V2_1.00u | SW9 |
| 1 | Macro3 | PCM_Switch_Keyboard_Hotswap_Kailh:SW_Hotswap_Kailh_Choc_V2_1.00u | SW18 |
| 1 | Macro4 | PCM_Switch_Keyboard_Hotswap_Kailh:SW_Hotswap_Kailh_Choc_V2_1.00u | SW27 |
| 1 | N | PCM_Switch_Keyboard_Hotswap_Kailh:SW_Hotswap_Kailh_Choc_V2_1.00u | SW37 |
| 1 | O | PCM_Switch_Keyboard_Hotswap_Kailh:SW_Hotswap_Kailh_Choc_V2_1.00u | SW22 |
| 1 | OS | PCM_Switch_Keyboard_Hotswap_Kailh:SW_Hotswap_Kailh_Choc_V2_1.25u | SW47 |
| 1 | P | PCM_Switch_Keyboard_Hotswap_Kailh:SW_Hotswap_Kailh_Choc_V2_1.00u | SW23 |
| 1 | PrtSc | PCM_Switch_Keyboard_Hotswap_Kailh:SW_Hotswap_Kailh_Choc_V2_1.00u | SW7 |
| 1 | Reset | Button_Switch_SMD:SW_SPST_PTS647_Sx50 | SW28 |
| 1 | Right | PCM_Switch_Keyboard_Hotswap_Kailh:SW_Hotswap_Kailh_Choc_V2_1.00u | SW51 |
| 1 | Shift | PCM_Switch_Keyboard_Hotswap_Kailh:SW_Hotswap_Kailh_Choc_V2_1.75u | SW42 |
| 1 | Space | PCM_Switch_Keyboard_Hotswap_Kailh:SW_Hotswap_Kailh_Choc_V2_2.00u | SW45 |
| 1 | U | PCM_Switch_Keyboard_Hotswap_Kailh:SW_Hotswap_Kailh_Choc_V2_1.00u | SW20 |
| 1 | USB_C_Receptacle_USB2.0_16P | Connector_USB:USB_C_Receptacle_GCT_USB4105-xx-A_16P_TopMnt_Horizontal | J1 |
| 1 | Up | PCM_Switch_Keyboard_Hotswap_Kailh:SW_Hotswap_Kailh_Choc_V2_1.00u | SW43 |
| 1 | Y | PCM_Switch_Keyboard_Hotswap_Kailh:SW_Hotswap_Kailh_Choc_V2_1.00u | SW19 |
| 1 | [ | PCM_Switch_Keyboard_Hotswap_Kailh:SW_Hotswap_Kailh_Choc_V2_1.00u | SW24 |
| 1 | \ | PCM_Switch_Keyboard_Hotswap_Kailh:SW_Hotswap_Kailh_Choc_V2_1.00u | SW35 |
| 1 | ] | PCM_Switch_Keyboard_Hotswap_Kailh:SW_Hotswap_Kailh_Choc_V2_1.00u | SW25 |
| 1 | ` | PCM_Switch_Keyboard_Hotswap_Kailh:SW_Hotswap_Kailh_Choc_V2_1.00u | SW16 |
The 180 most common of 205 parts.
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Questions
How big is the J2J PCB R PCB?
It measures 185.7 × 119.1 mm and has 2 copper layers, 1.6 mm thick.
What parts does the J2J PCB R use?
205 parts, built around the ATMEGA32U4-MU, 1N4148W and SK6812MINI-E. 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 J2J PCB R KiCad files?
From the asumo-1xts/J2J repository on GitHub, at the commit this page was made from: the board is J2J_PCB_R/J2J_PCB_R.kicad_pcb and its schematic J2J_PCB_L/J2J_PCB_L.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the J2J PCB R design in my own project?
Its repository publishes it under the GPL-3.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).