2 layers24.4 × 24.4 mm
OSO SWAT B1
joeycastillo/Sensor-Watch
A board replacement for the classic Casio F-91W wristwatch
39 parts2.1k
2 layers77.6 × 116.7 mm
Number Pad
SabhyaAggarwal/Number-Pad- Size
- 77.6 × 116.7 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 39
- Nets
- 31
- Pads
- 159
- Tracks, vias
- 121, 0
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 25 Sep 2026
- Updated
- 27 Sep 2026
Overview
Number Pad is an open-source printed circuit board by SabhyaAggarwal, from the SabhyaAggarwal/Number-Pad repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 77.6 × 116.7 mm with 39 parts on 31 nets, routed with 121 tracks and 0 vias.
Its parts include 20 switches, 17 diodes and 1 IC. It belongs with the RP2040 boards of this library.
README
README.mdNumber Pad
This is a keyboard made by me that acts as a number pad for many keyboards today that don't include it, and it's designed for use in, say, the calculator app. The PCB was designed in Ki-CAD, the case was designed in Onshape, and it uses QMK firmware. As per me, the design and shape is beautiful...
BOM
| Name | Description | Quantity | Total Cost | Link | Distributor |
|---|---|---|---|---|---|
| PCB | Main PCB(includes payment fee) | 1 | $1.36 | https://aivon.com/ | AIVON |
| Seeed Studio XIAO RP2040 | Main Dev Board(cost includes shipping) | 1 | $8.72 | https://sharvielectronics.com/product/xiao-rp2040-supports-arduino-micropython-and-circuitpython-seeed-studio/ | sharvi electronics |
| MX Switches | MX switches(pack of 10 and 2 of them = 20 keys)(includes shipping) | 2 | $5.11 | https://stackskb.com/store/click-inc-hp-switch-pack-of-10-pre-order/ | stackskb |
| Keycaps | Numpad keycaps(shipping grouped with switches) | 1 | $1.57 | https://stackskb.com/store/numpad-keycaps/?attribute_variant=MDA+Lavender | stackskb |
| 1N4148 Diode | 1N4148 Diode(price not include shipping as shipping is shared with the XIAO RP2040) | 17 | $0.60 | https://sharvielectronics.com/product/1n4148-small-signal-fast-switching-diodes-do-35-package/ | sharvi electronics |
| 2u MX Stabilizers | Stabilizers(shipping grouped with switches) | 3 | $3.13 | https://stackskb.com/store/genuine-cherry-mx-plate-mount-stabilizers-2u/ | stackskb |
Images
CAD
3D Renders of the Number Pad
3D render of Case
3D render of Plate
Note: Earlier I decided I would have an OLED. Later I decided I should not. This link is for the one which shows the OLED would be there but actually we're not going to place it that way. I am just giving that link because it has the exact correct placements and it also has the plate and case Part Studio, and for the one with none. of them, it's this...
PCB
3D render of PCB
PCB layout
Schematic
Parts
39| Qty | Value | Footprint | References |
|---|---|---|---|
| 17 | 1N4148 | Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal | D1, D2, D3, D4, D5, D6, D7, D8, D10, D11, D12, D13, D14, D15, D16, D17 +1 |
| 17 | SW_Push | PCM_marbastlib-mx:SW_MX_1u | SW1, SW2, SW3, SW4, SW5, SW6, SW7, SW8, SW10, SW11, SW12, SW13, SW14, SW15, SW16, SW17 +1 |
| 3 | MX_stab | PCM_marbastlib-mx:STAB_MX_2u | S8, S15, S16 |
| 1 | LOGO | Polyglot_footprints:40mm_Sabhya | G*** |
| 1 | XIAO-RP2040-DIP | Seeed_Studio_XIAO_Series:XIAO-RP2040-DIP | U1 |
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Questions
How big is the Number Pad PCB?
It measures 77.6 × 116.7 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Number Pad use?
39 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 Number Pad KiCad files?
From the SabhyaAggarwal/Number-Pad repository on GitHub, at the commit this page was made from: the board is PCB/PCB.kicad_pcb and its schematic PCB/PCB.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Number Pad 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).