Numbpad
About the Numbpad PCB
Numbpad is an open source STM32 PCB design by calvin-mcd, published on GitHub under the CC-BY-NC-4.0 license. It is a 4-layer board measuring 76 × 76.5 mm, with 33 components from 17 distinct parts.
Its main chip is the STM32F072CBUX, from the STM32 family. Other key parts include the PRTR5V0U2X, XC6206PXXXMR, 74HC4051 and OPA354. By type, the board carries 11 capacitors, 11 resistors, 5 ICs and 1 fuse.
It belongs with the keyboards designs in this gallery.
From the project
topre pcb for the vault35
The travaultas are a series of EC (topre) pcbs for mechvault's Vault35 series designed by calvin0563.
The series consists of the HHKB and WKL pcbs, both supporting a single bottomrow layout with the double 1.75u splitbars, and the Number/Macropad, supporting all layout options.
Firmware source code and the OEM plate file are available in their respective folders. In order to fit the topre pcb into the case, small modifications to some housings are necessary. Please refer to the extensive build guide by cia\_moonchild in order to learn how to make the assembled pcb fit into the vault35 case.
Main components on the Numbpad
Numbpad bill of materials (BOM)
33 components, 17 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | STM32F072CBUX STM32F072CBUx | QFN-48-1EP_7x7mm_P0.5mm_EP5.6x5.6mm | U1 |
| 1 | PRTR5V0U2X | SOT-143 | U2 |
| 1 | XC6206PXXXMR XC6206PxxxMR | SOT-23 | U3 |
| 1 | 74HC4051 | TSSOP16 | U4 |
| 1 | OPA354 | SOT-23-5 | U5 |
| 2 | 1uF | C_0402_1005Metric | C_LDO1, C_LDO2 |
| 1 | 500MA 500mA | Fuse_0805_2012Metric | F1 |
| 2 | 5.1k | R_0402_1005Metric | R_USB1, R_USB2 |
| 1 | HRO-TYPE-C-31-M-12 | XUNPU-TYPEC-312DSS-ACP16-Assembly | USB1 |
| 8 | 100NF 100nf | C_0402_1005Metric | C1, C2, C3, C4, C5, C7, C9, C10 |
| 1 | 10UF 10uF | C_0402_1005Metric | C6 |
| 1 | 1UF 1uF | C_0402_1005Metric | C8 |
| 1 | C1530 220pF NP0 | C_0402_1005Metric | C11 |
| 1 | 10K 10k | R_0402_1005Metric | R1 |
| 4 | 100 | R_0402_1005Metric | R2, R3, R4, R5 |
| 5 | 100K 100k | R_0402_1005Metric | R6, R7, R8, R9, R11 |
| 1 | 1k | R_0402_1005Metric | R12 |
Numbpad design files
The KiCad project lives in the calvin-mcd/travaulta repository on GitHub; these links point at the commit this page was built from.
Numbpad: common questions
What microcontroller does the Numbpad use?
The Numbpad is built around the STM32F072CBUX, from the STM32 family.
How big is the Numbpad PCB?
The Numbpad measures 76 × 76.5 mm, has 4 copper layers and is 1.6 mm thick.
How many components are on the Numbpad?
33 components, from 17 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the Numbpad design files?
From the calvin-mcd/travaulta repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.
Can I use the Numbpad design in my own project?
It is published under CC-BY-NC-4.0, which limits how it may be reused; read the license before building on it.
Can I test firmware for the Numbpad without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug STM32 firmware against it before you order a PCB.
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