2 layers326.7 × 132.3 mm
Auth75
Lumethra/Auth75
This is a 75% keyboard with a fingerprint sensor. What? A fingerprint sensor in a keyboard? Yes, you've heard it right! This keyboard includes a working fingerprint sensor.
232 parts1
2 layers175.4 × 142.6 mm
CADPad
Lumethra/CADPad1SHHH, this is a gift, dont spoiler it, SHHHH. But what exactly is this?? Good question. Its a keyboard. Again. Wait, what does again mean, well its my second one. My Auth75 was my first one. Back to what this is.
- Size
- 175.4 × 142.6 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 108
- Nets
- 99
- Pads
- 483
- Tracks, vias
- 731, 80
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 22 May 2026
- Updated
- 12 Jun 2026
Overview
CADPad is an open-source printed circuit board by Lumethra, from the Lumethra/CADPad repository on GitHub. It is a 2-layer board of 175.4 × 142.6 mm with 108 parts on 99 nets, routed with 731 tracks and 80 vias.
It is built around the SL2.1S, DW01A and MCP73831T-2ACI/OT-HXY, with the EC11E15244G1, FS8205A and S2B-PH-SM4-TB(LF)(SN) among its other parts. Its parts include 30 diodes, 29 switches, 15 resistors, 14 capacitors and 4 ICs. It belongs with the keyboards and input boards and the nRF52 and nRF5x boards of this library.
Main components
6
SL2.1S
SSOP-160℃~+70℃ 120mA 2.5mA 4 4V~5.25V Hub USB 2.0 SSOP-16 USB HUB Controllers ROHSCoreChipsUSB Converters
DW01A
SOT-23-6L-40℃~+85℃ 1 2.5V 300mV~10V 3uA 4.3V Protection IC Support SOT-23-6L Battery Management ROHSPUOLOPBattery Management
MCP73831T-2ACI/OT-HXY
SOT-23-5LBattery ManagementHXY MOSFET
EC11E15244G1
插件插件 Rotary Encoders ROHSALPSALPINERotary EncodersFS8205A
SOT-23-6-55℃~+150℃ 1.2V 1.5W 2 N-Channel 20V 31.5mΩ@2.5V 466pF 5.7nC@4.5V 58pF 65pF 6A SOT-23-6 MOSFETs ROHSTECH PUBLICMOSFETs
S2B-PH-SM4-TB(LF)(SN)
SMD,P=2mm,卧贴-25℃~+85℃ 1 100V 1x2P 2 2A 2P 2mm 5.5mm 7.9mm 8.6mm Auxiliary Solder Pin Beige Copper alloy PA PH Surface Mount, Right Angle Tin UL94V-0 SMD,P=2mm,卧贴 Wire To Board Connector ROHSJSTWire To Board Connector
README
README.mdCADPad
What is this??
SHHH, this is a gift, dont spoiler it, SHHHH. But what exactly is this?? Good question. Its a keyboard. Again. Wait, what does again mean, well its my second one. My Auth75 was my first one. Back to what this is. Its technically a keyboard, but I would rather call it a Macropad, because its firmwares purpose is to make 3d modeling in Onshape easier. This is also why its called a CADPad, not Catpad (meow), CADPad. C A D, like CAD-design.
Features:
- custom 27 keys leyout
- its kinda ergonomic? kinda.
- Nice!Nano V2
- ZMK firmware (hand written, yeeeeee)
- better ZMK support, because Nice!Nano V2
- build in BLE support
- LiPo battery support
- battery charger + support
- USB Hub (SL2.1)
- 1 USB-C upsream
- 4 USB-C donwstreams
- USB 2.0 fullspeed
Why though?
This is a gift to Chroma, my friend who likes to design 3d-models and print them with his 3d-printer. I though it would be nice to gift him a Macropad, my bad, its a CADPad, to make this process easier for him. It was also fun to design a PCB, that has a unique form.
How?
This CADPads development process was fairly easiy because of the knowledge from Auth75. It has 3 layers of keybinds, which u can cycle through with pressing the 2nd knob. The other knobs keypress is reserved for BLE pairing.
Renders
| PCB with Components |
|---|
 |
 |
| PCB without Components |
|---|
 |
 |
| Case |
|---|
 |
PCB + Schematics
| PCB |
|---|
 |
| Schematics |
|---|
 |
Zine
| Zine |
|---|
 |
BOM
| Part | Purpose | Cost | Quantity | Total Cost | LCSC/JLCPC Number | Link |
|---|---|---|---|---|---|---|
| PCB | connect all of the compoenents | $14.10 | 1 (5) | $14.10 | ~ | JLCPCB |
| Nice!Nano V2 | handle the firmware | €24.63 | 1 | €24.63 | ~ | 42keebs |
| Kailh Hotswap Sockets | holding the switches to the PCB without soldering | $0.1183 | 78 | ~$9 | C2803348 | JLCPCB |
| Kailh (Cocoa) Switches | the switches you can press | $0 (comes with a Rainy75) | 78 | $0 (already owned) | ~ | ~ |
| Keycaps | goes onto the switches for better look and feel | $0 (3d printing ABS) | 78 | $0 (3d printed) | ~ | ~ |
| EC11 Rotary Encoder Switch | goes uii and click click | $2.22 | 1 | $2.22 | C370970 | JLCPCB / Amazon |
| USB-C connector | connect to laptop | $0.0740 | 4 | $0.296 | C2765186 | JLCPCB |
| SL2.1s | USB Hub core component | $0.2258 | 1 | $0.2258 | C2684433 | JLCPCB |
| DW01A | battery protector | $0.0426 | 1 | $0.0426 | C351410 | JLCPCB |
| FS8205A | mosfet for protector | $0.0470 | 1 | $0.0470 | C2830320 | JLCPCB |
| S2B-PH-SM4-TB | LiPo battery connector | $0.2014 | 1 | $0.2014 | C295747 | JLCPCB |
| Diodes | prevent voltage from backflowing and causing problems | $0.0117 | 82 | ~$0.9594 | C81598 | JLCPCB |
| Resistors | prevent things go boom | ~$0.0016 | 19 | ~$0.0304 | C23186, C21190, C22775 | C23186 / C21190 / C22775 |
| Capacitors | smooth out the power | $0.0032 - $0.0110 | 14 | ~$0.0956 | C15849, C19666, C14663 | C15849 / C19666 / C14663 |
the prices can vary depending on the provider
you can find the JLCPCB parts on LCSC too (exept the PCB and the Pico)
Contribute
Want to make anything better? Found any bugs? Anything always going booom?? Feel free to open a PR (pull request) and lets make the project better. ^_^
the libraries are all imported with easyeda2kicad and kiswitch
Thank you
A huge thank you too all these persons helping me making this project possible, thank you helping me sanity check, thank you for all these support.
Thank you, <3 u all ^_^
Parts
108| Qty | Value | Footprint | References |
|---|---|---|---|
| 30 | ~ | Diode_SMD:D_SOD-123 | D1, D2, D10, D11, D12, D13, D14, D15, D16, D17, D18, D19, D20, D21, D22, D23 +14 |
| 27 | ~ | Switch_Keyboard_Hotswap_Kailh:SW_Hotswap_Kailh_MX | S1, S2, S10, S11, S12, S13, S14, S15, S16, S17, S18, S19, S20, S21, S22, S23 +11 |
| 8 | 1uf | Capacitor_SMD:C_0603_1608Metric | C1, C2, C3, C4, C5, C6, C8, C10 |
| 8 | 56k | Resistor_SMD:R_0603_1608Metric | R3, R4, R5, R6, R7, R8, R9, R10 |
| 5 | TYPE-C 16PIN 2MD | easyeda2kicad:USB-C-SMD_TYPE-C-6PIN-2MD-073 | USB1, USB2, USB3, USB4, USB5 |
| 4 | 100nf | Capacitor_SMD:C_0603_1608Metric | C7, C9, C11, C12 |
| 3 | 1k | Resistor_SMD:R_0603_1608Metric | R12, R14, R19 |
| 3 | 5.1k | Resistor_SMD:R_0603_1608Metric | R1, R2, R13 |
| 2 | 4.7uF | Capacitor_SMD:C_0603_1608Metric | C13, C14 |
| 2 | EC11E15244G1 | easyeda2kicad:SW-TH_EC11E15244G1 | SW1, SW2 |
| 1 | 100 | Resistor_SMD:R_0603_1608Metric | R11 |
| 1 | DW01A_C351410 | easyeda2kicad:SOT-23-6_L2.9-W1.6-P0.95-LS2.8-BL | U3 |
| 1 | FS8205A_C2830320 | easyeda2kicad:SOT-23-6_L2.9-W1.6-P0.95-LS2.8-BR | Q1 |
| 1 | LOGO | Silkscreen:flag-orpheus-top | G*** |
| 1 | LOGO | Silkscreen:robots | G*** |
| 1 | LOGO | Silkscreen:portal-person-dropping | G*** |
| 1 | LOGO | Silkscreen:cadpad | G*** |
| 1 | LOGO | Silkscreen:portal-gun | G*** |
| 1 | LOGO | Silkscreen:portal | G*** |
| 1 | LOGO | Silkscreen:portal things | G*** |
| 1 | MCP73831T-2ACI/OT | easyeda2kicad:SOT-23-5_L3.0-W1.7-P0.95-LS2.8-BL | U4 |
| 1 | Nice_Nano_V2 | ScottoKeebs_MCU:Nice_Nano_V2 | U1 |
| 1 | S2B-PH-SM4-TB | easyeda2kicad:CONN-SMD_P2.00_S2B-PH-SM4-TB-LF-SN | CN1 |
| 1 | SL2.1S | easyeda2kicad:SSOP-16_L4.6-W2.6-P0.53-LS4.0-BL | U2 |
The 106 most common of 108 parts.
Similar boards
- 2 layers20.1 × 62.5 mm
- 2 layers70 × 120 mm
Multimetre V2
hilham1990/Multimetre
AkademiUsta Multimetre: ATmega328P + 16 bit ADS1115 ADC, OLED ekran ve Li-ion pil ile açık kaynak el multimetresi. KiCad 10 dosyaları, Gerber ve LCSC kodlu BOM. Kart henüz üretilmedi.
86 parts - 2 layers35 × 100 mm
WalkieTalkie
GuzziFlipFlops/ESP32-Walkie-Talkie
An open source ESPNOW based walkie talkie with a 600 meter tested distance, with an OLED and multiple buttons to interact with
66 parts7MIT - 4 layers45 × 34 mm
Triangle flywheel balancer
RobbyV2/smart_latch_lock
A self-closing bike lock built as a clamshell ring. A fixed arc bolts to the housing, a hinged arc swings 180 degrees to meet it, and a worm gearmotor closes the loop around the frame and rim on a button press or a BLE…
70 parts - 4 layers38.4 × 128.5 mm
- 4 layers58.4 × 22.9 mm
Quickfeather board
antmicro/quickfeather-dev-board
This project contains open hardware design files for the QuickFeather development board based on the QuickLogic EOS S3 Sensor Processing Platform.
101 parts6CC-BY-SA-4.0 - 2 layers142.7 × 72 mm
Blinky bowtie
joshajohnson/bsidescbr2021
Slides and Design Files for BSides Canberra 2021
101 parts5GPL-3.0
Questions
How big is the CADPad PCB?
It measures 175.4 × 142.6 mm and has 2 copper layers, 1.6 mm thick.
What parts does the CADPad use?
108 parts, built around the SL2.1S, DW01A, MCP73831T-2ACI/OT-HXY and EC11E15244G1. 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 CADPad KiCad files?
From the Lumethra/CADPad repository on GitHub, at the commit this page was made from: the board is PCB/CADPad.kicad_pcb and its schematic PCB/CADPad.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the CADPad design in my own project?
Its repository states no licence, so its author keeps all rights: ask Lumethra before reusing the design.