2 layers220 × 70 mm
Bemini rp
ianklug/bemini
A miniature mechanical keyboard controller with a rotary encoder for staggered-key rhythm games.
70 parts55CC-BY-SA-4.0
2 layers148.2 × 114.4 mm
Left pcb
mayjs/maykb_g4My fourth custom split keyboard with ANSI layout
- Size
- 148.2 × 114.4 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 121
- Nets
- 94
- Pads
- 461
- Tracks, vias
- 709, 63
- Pours
- 3
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 4 Feb 2024
- Updated
- 25 Feb 2024
Overview
Left pcb is an open-source printed circuit board by mayjs, from the mayjs/maykb_g4 repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 148.2 × 114.4 mm with 121 parts on 94 nets, routed with 709 tracks and 63 vias.
It is built around the RP2040, W25Q128JVSIQ and USBLC6-2SC6, with the WS2812B and BSS138 among its other parts. Its parts include 35 diodes, 32 switches, 20 capacitors, 9 resistors and 4 ICs. It belongs with the keyboards and input boards and the RP2040 boards of this library.
Main components
5
RP2040
LQFN-56(7x7)12bit 133MHz 30 LQFN-56(7x7) Microcontrollers (MCU/MPU/SOC) ROHSRaspberry PiMicrocontrollers (MCU/MPU/SOC)
W25Q128JVSIQ
SOIC-8-208mil-40℃~+85℃ 100,000 cycles 120ms@(32KB) 128Mbit 133MHz 1uA 2.7V~3.6V 20 Years 3ms Power-on reset、Hardware write protection、Software write protection、Write enable latch、Absolute write protection SPI SOIC-8-208mil NOR FLASH ROHSWinbondNOR FLASH
USBLC6-2SC6
SOT-23-60.35pF、0.8pF 100nA 150W@8/20us 15V 2 5V 6A@8/20us 6V ESD SOT-23-6 ESD and Surge Protection (TVS/ESD) ROHSUMWESD And Surge Protection (TVS/ESD)
WS2812B
5mm X 5mm Surface Mount RGB LED with Intelligent ControlWorldsemiUncategorised
BSS138
SOT-23-55℃~+150℃ 1 N-channel 1.1Ω@10V、1.2Ω@4.5V 1.2V 1.7nC@10V 17.5pF 340mA 350mW 50V 6.5pF N-Channel SOT-23 MOSFETs ROHShongjiachengMOSFETs
README
README.mdmaykb G4
This is my fourth custom split keyboard, this time using an ANSI layout.
Caveats / Known Issues
In its current form, the level shifter for the WS2812b LEDs does NOT work. With most clones, you can just remove the Mosfet and the two resistors next to it and bridge the microcontroller LED data input directly to the LED data input. Some LEDs might not properly recognize the 3.3V signal though, so you might see some glitches due to this.
Otherwise, the keyboard works without any issues.
Parts
121| Qty | Value | Footprint | References |
|---|---|---|---|
| 32 | D | Diode_SMD:D_SOD-323F | D1, D2, D10, D11, D12, D13, D14, D15, D16, D17, D18, D19, D20, D21, D22, D23 +16 |
| 25 | SW_Push_45deg | Button_Switch_Keyboard:SW_Cherry_MX_1.00u_PCB | SW1, SW11, SW12, SW13, SW14, SW16, SW17, SW18, SW19, SW20, SW21, SW22, SW23, SW24, SW26, SW27 +9 |
| 13 | 100nF | Capacitor_SMD:C_0402_1005Metric | C1, C5, C6, C9, C10, C11, C12, C13, C14, C15, C18, C19, C20 |
| 4 | 1uF | Capacitor_SMD:C_0402_1005Metric | C4, C8, C16, C17 |
| 3 | 1k | Resistor_SMD:R_0402_1005Metric | R1, R2, R7 |
| 3 | SW_Push_45deg | Button_Switch_Keyboard:SW_Cherry_MX_1.25u_PCB | SW5, SW10, SW15 |
| 3 | WS2812B | LED_SMD:LED_WS2812B_PLCC4_5.0x5.0mm_P3.2mm | LED1, LED2, LED3 |
| 2 | 10k | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R8, R9 |
| 2 | 22pF | Capacitor_SMD:C_0402_1005Metric | C2, C3 |
| 2 | 27R | Resistor_SMD:R_0603_1608Metric | R5, R6 |
| 2 | 5k1 | Resistor_SMD:R_0402_1005Metric | R3, R4 |
| 2 | SW_Push | Button_Switch_SMD:SW_SPST_TL3342 | SW_BOOT1, SW_RESET1 |
| 2 | SW_Push_45deg | Button_Switch_Keyboard:SW_Cherry_MX_2.25u_PCB | SW4, SW25 |
| 1 | 10uF | Capacitor_SMD:C_0402_1005Metric | C7 |
| 1 | 12MHz | Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm | Y1 |
| 1 | 500mA | Fuse:Fuse_1206_3216Metric | F1 |
| 1 | BSS138 | Package_TO_SOT_SMD:SOT-23 | Q1 |
| 1 | ConnLeft | audio_jack:PJ-342B | J3 |
| 1 | ConnRight | audio_jack:PJ-342B | J4 |
| 1 | RP2040 | Sleep-Lib:RP2040-QFN-56 | U3 |
| 1 | SWD | Connector_PinSocket_2.54mm:PinSocket_1x05_P2.54mm_Vertical | J2 |
| 1 | SW_Push_45deg | Button_Switch_Keyboard:SW_Cherry_MX_1.75u_PCB | SW3 |
| 1 | SW_Push_45deg | Button_Switch_Keyboard:SW_Cherry_MX_1.50u_PCB | SW2 |
| 1 | USBLC6-2SC6 | Package_TO_SOT_SMD:SOT-23-6 | U2 |
| 1 | USB_C_Receptacle_USB2.0 | Connector_USB:USB_C_Receptacle_HRO_TYPE-C-31-M-12 | J1 |
| 1 | W25Q128JVS | Package_SO:SOIC-8_5.23x5.23mm_P1.27mm | U1 |
| 1 | XC6206PxxxMR-Regulator_Linear | Package_TO_SOT_SMD:SOT-23 | U4 |
The 109 most common of 121 parts.
Questions
How big is the Left pcb PCB?
It measures 148.2 × 114.4 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Left pcb use?
121 parts, built around the RP2040, W25Q128JVSIQ, USBLC6-2SC6 and WS2812B. 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 pcb KiCad files?
From the mayjs/maykb_g4 repository on GitHub, at the commit this page was made from: the board is cad/pcb/left_pcb/left_pcb.kicad_pcb and its schematic cad/pcb/left_pcb/left_pcb.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Left pcb 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).
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