2 layers31.9 × 36 mm
Lemon pcb swizzle
rianadon/Cosmos-Keyboard-PCBs
Open-Source keyboard PCB designs for the Cosmos Keyboard Generator
63 parts43
2 layers21 × 51 mm
Coolboard
kusuta012/Krackboard1A RP2040 devboard
- Size
- 21 × 51 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 40
- Nets
- 56
- Pads
- 205
- Tracks, vias
- 487, 56
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 14 Jan 2026
- Updated
- 27 Jan 2026
Overview
Coolboard is an open-source printed circuit board by kusuta012, from the kusuta012/Krackboard repository on GitHub, published under the MIT licence. It is a 2-layer board of 21 × 51 mm with 40 parts on 56 nets, routed with 487 tracks and 56 vias.
It is built around the RP2040 and WS2812B-2020. Its parts include 17 capacitors, 9 resistors, 4 ICs, 4 connectors and 1 diode. It belongs with the microcontroller boards boards and the RP2040 boards of this library.
Main components
2
RP2040
LQFN-56(7x7)12bit 133MHz 30 LQFN-56(7x7) Microcontrollers (MCU/MPU/SOC) ROHSRaspberry PiMicrocontrollers (MCU/MPU/SOC)
WS2812B-2020
SMD,2.2x2mm0.6mA 0.84mm 120us 160mcd 200mcd 2kHz 2mm 2mm 300ns 470.4nm 515.6nm 520mcd 5V 622.5nm 800Kbit/s Built-in power-on reset circuit、Built-in power-on reset circuit、Integrated intelligent reverse connection protection function Top-mount SMD,2.2x2mm RGB LEDs(Built-in IC) ROHSWorldsemiRGB LEDs(Built-In IC)
README
README.mdKrackboard
A RP2040 devboard
This is my first big project , I have no prior experience with building electronic stuff , it was very fun to design this devboard. I have followed KaiPereira™ tutorial.
SCHEMATICS
PCB
SHOWCASE
JLCPCB
BOM
| LCSC Part Number | Description | Total Quantity | Ext. Price (USD) |
|---|---|---|---|
| C25104 | 330Ω resistor 0402 | 2 | 0.0014 |
| C52923 | 1µF capacitor 0402 | 4 | 0.012 |
| C39051 | MCP1700T-3302 LDO | 5 | 1.7895 |
| C1562 | 33pF capacitor | 4 | 0.0044 |
| C11702 | 1kΩ resistor | 4 | 0.0024 |
| C25905 | 5.1kΩ resistor | 4 | 0.0024 |
| C9002 | 12 MHz crystal | 2 | 0.136 |
| C91447 | IRM-H638T IR receiver | 5 | 1.0965 |
| C19702 | 10µF capacitor | 4 | 0.024 |
| C25076 | 100Ω resistor | 2 | 0.0012 |
| C2040 | RP2040 MCU | 2 | 1.913 |
| C1525 | 0.1µF capacitor | 22 | 0.0286 |
| C2843335 | W25Q16JV Flash | 2 | 1.8284 |
| C25744 | 10kΩ resistor | 2 | 0.0012 |
| C165948 | USB-C Type-C-31-M-12 | 2 | 0.3538 |
| C25100 | 27Ω resistor | 20 | 0.012 |
| C720477 | SW_Push | 2 | 0.0890 |
| LOCAL_SHOP | WS2812B-2020 RGB LED | 1 | 0.15 |
| LOCAL_SHOP | Connector 1x20 | 2 | 0.33 |
| LOCAL_SHOP | Connector 1x03 | 1 | 0.1 |
Parts
40| Qty | Value | Footprint | References |
|---|---|---|---|
| 11 | 0.1uF | Capacitor_SMD:C_0402_1005Metric | C2, C3, C4, C5, C6, C7, C8, C9, C11, C12, C17 |
| 2 | 10uF | Capacitor_SMD:C_0603_1608Metric | C13, C14 |
| 2 | 1K | Resistor_SMD:R_0402_1005Metric | R5, R6 |
| 2 | 1uF | Capacitor_SMD:C_0402_1005Metric | C1, C10 |
| 2 | 27 | Resistor_SMD:R_0402_1005Metric | R3, R4 |
| 2 | 33pF | Capacitor_SMD:C_0402_1005Metric | C15, C16 |
| 2 | 5.1K | Resistor_SMD:R_0402_1005Metric | R1, R2 |
| 2 | Conn_01x20 | Connector_PinHeader_2.54mm:PinHeader_1x20_P2.54mm_Vertical | J2, J3 |
| 1 | 100 | Capacitor_SMD:C_0402_1005Metric | R9 |
| 1 | 10K | Resistor_SMD:R_0402_1005Metric | R7 |
| 1 | 12 MHz | Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm | Y1 |
| 1 | 330 | Capacitor_SMD:C_0402_1005Metric | R8 |
| 1 | Conn_01x03 | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J4 |
| 1 | IRM-H6xxT | OptoDevice:Everlight_IRM-H6xxT | U3 |
| 1 | LOGO | bull:cat_large | G*** |
| 1 | LOGO | bull:flag | G*** |
| 1 | LOGO | bull:name_banana | G*** |
| 1 | MCP1700x-330xxTT | Package_TO_SOT_SMD:SOT-23 | U2 |
| 1 | RP2040 | Package_DFN_QFN:QFN-56-1EP_7x7mm_P0.4mm_EP3.2x3.2mm | U1 |
| 1 | SW_Push | Button_Switch_SMD:SW_Push_SPST_NO_Alps_SKRK | SW1 |
| 1 | USB_C_Receptacle_USB2.0_14P | Connector_USB:USB_C_Receptacle_HRO_TYPE-C-31-M-12 | J1 |
| 1 | W25Q16JVUXIQ TR | Package_SON:Winbond_USON-8-1EP_3x2mm_P0.5mm_EP0.2x1.6mm | U4 |
| 1 | WS2812B-2020 | LED_SMD:LED_WS2812B-2020_PLCC4_2.0x2.0mm | D1 |
Questions
How big is the Coolboard PCB?
It measures 21 × 51 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Coolboard use?
40 parts, built around the RP2040 and WS2812B-2020. 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 Coolboard KiCad files?
From the kusuta012/Krackboard repository on GitHub, at the commit this page was made from: the board is PCB/coolboard.kicad_pcb and its schematic PCB/coolboard.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Coolboard design in my own project?
Its repository publishes it under the MIT 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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