HardLabs

Keyword

notaroomba·keybytes·hardware/keyword/keyword.kicad_pcb

Keyword PCB layout, top view — open source STM32 board by notaroomba
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About the Keyword PCB

Keyword is an open source STM32 PCB design by notaroomba, published on GitHub. It is a 4-layer board measuring 19.1 × 19.1 mm, with 69 components from 38 distinct parts.

Its main chip is the STM32WB55RGVX, from the STM32 family. Other key parts include the TPD2EUSB30, NX2012SA-32.768KHZ-STD-MUB-2, YZ13515055F-02025-02, BQ25895RTW and C882955. By type, the board carries 26 capacitors, 19 ICs, 13 resistors, 6 connectors, 2 inductors and 1 crystal.

It belongs with the keyboards, power & battery and iot & wireless designs in this gallery.

From the project

A truly modular keyboard

- Truly modular - every key is its own self-contained board. Pop them off, rearrange the layout, and snap them back wherever you want. - Magnetic keycaps - caps hold on with embedded 2×0.5mm magnets and latch onto the switch's side rails. No tools, no soldering. - Pogo-pin interconnect - keys link to the main board (and each other) through spring-loaded pogo pins and pads, so there's nothing to plug in. - Smart per-key MCU - each module runs a cheap CH32V003 RISC-V microcontroller and reports over a shared I²C bus. - Bluetooth + USB main board - the central board is built around an…

Keyword, from the project README
From the project README

Main components on the Keyword

TPD2EUSB30NX2012SA-32.768KHZ-STD-MUB-2YZ13515055F-02025-02BQ25895RTWC882955W25Q16JVUXIQSTM32WB55RGVXMLPF-WB-04D3XL-1608RGBCXRTC252012S2R2MBCASZYY0402Y_C434450TPS631000DRLRYZ37215050R-02025-05

Keyword bill of materials (BOM)

69 components, 38 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
TPD2EUSB30
U2
1
NX2012SA-32.768KHZ-STD-MUB-2
U3
6
YZ13515055F-02025-02
U4, U5, U6, U7, U13, U15
1
BQ25895RTW
U8
1
C882955
DFE252012P-1R0M=P2
U9
1
W25Q16JVUXIQ
U10
1
STM32WB55RGVX
STM32WB55RGVx
U11
1
MLPF-WB-04D3
U12
1
XL-1608RGBC
U14
1
XRTC252012S2R2MBCA
U16
1
SZYY0402Y_C434450
U17
1
TPS631000DRLR
U18
2
YZ37215050R-02025-05
U19, U20
1
NX2016SA-32MHZ-STD-CZS-5
X1
6
YZ00615050R-08
CN2, CN3, CN4, CN7, CN8, CN9
1
2450AT18A100E
AE1
1
C2765186
TYPE-C 16PIN 2MD(073)
USB1
1
10UH
10uH
L1
1
10NH
10nH
L2
4
10PF
10pF
C1, C2, C6, C9
Show 18 more
QtyPartRefs
9
100NF
100nF
C3, C25, C26, C27, C29, C30, C32, C34 +1
1
1UF
1uF
C16
1
4.7UF
4.7uF
C17
3
10UF
10uF
C18, C20, C23
1
47NF
47nF
C19
1
22UF
22uF
C21
1
47UF
47uF
C22
3
4.7UF
4.7uF
C24, C28, C31
2
1UF
1uF
C33, C36
2
5.1K
R1, R2
1
260R
R4
1
5.23K
R5
1
30.1K
R6
1
10K
R7
2
4.7K
R8, R11
1
511K
R9
1
91K
R10
3
100R
R12, R13, R14

Keyword design files

The KiCad project lives in the notaroomba/keybytes repository on GitHub; these links point at the commit this page was built from.

Keyword: common questions

What microcontroller does the Keyword use?

The Keyword is built around the STM32WB55RGVX, from the STM32 family.

How big is the Keyword PCB?

The Keyword measures 19.1 × 19.1 mm, has 4 copper layers and is 1.5842 mm thick.

How many components are on the Keyword?

69 components, from 38 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 Keyword design files?

From the notaroomba/keybytes 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 Keyword design in my own project?

The repository has no license, so all rights stay with notaroomba. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Keyword 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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