Keyword bottom
About the Keyword bottom PCB
Keyword bottom is an open source PCB design by notaroomba, published on GitHub. It is a 4-layer board measuring 19.1 × 19.1 mm, with 34 components from 23 distinct parts.
Other key parts include the TPD2EUSB30, YZ13515055F-02025-02, BQ25895RTW, C882955 and XRTC252012S2R2MBCA. By type, the board carries 14 ICs, 8 capacitors, 8 resistors and 3 connectors.
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…
Main components on the Keyword bottom
Keyword bottom bill of materials (BOM)
34 components, 23 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | TPD2EUSB30 | Texas_DRT-3 | U2 |
| 6 | YZ13515055F-02025-02 | CONN-SMD_YZ13515055F-02025-02 | U4, U5, U6, U7, U13, U15 |
| 1 | BQ25895RTW | Texas_RTW_WQFN-24-1EP_4x4mm_P0.5mm_EP2.7x2.7mm_ThermalVias | U8 |
| 1 | C882955 DFE252012P-1R0M=P2 | L1008 | U9 |
| 1 | XRTC252012S2R2MBCA | IND-SMD_L2.5-W2.0-B | U16 |
| 1 | SZYY0402Y_C434450 | LED0402-FD_YELLOW | U17 |
| 1 | TPS631000DRLR | SOT-583-8_L2.1-W1.2-P0.50-LS1.6-BL | U18 |
| 2 | YZ37215050R-02025-05 | SMD_2P_YZ37215050R-02025-05 | U19, U20 |
| 3 | YZ00615050R-08 | TESTPOINT-SMD_BD2.0-H5.0 | CN2, CN3, CN4 |
| 1 | C2765186 TYPE-C 16PIN 2MD(073) | USB-C-SMD_TYPE-C-6PIN-2MD-073 | USB1 |
| 1 | 1UF 1uF | C_0603_1608Metric | C16 |
| 1 | 4.7UF 4.7uF | C_0402_1005Metric | C17 |
| 3 | 10UF 10uF | C_0603_1608Metric | C18, C20, C23 |
| 1 | 47NF 47nF | C_0402_1005Metric | C19 |
| 1 | 22UF 22uF | C_0603_1608Metric | C21 |
| 1 | 47UF 47uF | C_0805_2012Metric | C22 |
| 2 | 5.1K | R_0402_1005Metric | R1, R2 |
| 1 | 260R | R_0402_1005Metric | R4 |
| 1 | 5.23K | R_0402_1005Metric | R5 |
| 1 | 30.1K | R_0402_1005Metric | R6 |
Show 3 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 10K | R_0402_1005Metric | R7 |
| 1 | 511K | R_0402_1005Metric | R9 |
| 1 | 91K | R_0402_1005Metric | R10 |
Keyword bottom 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 bottom: common questions
How big is the Keyword bottom PCB?
The Keyword bottom measures 19.1 × 19.1 mm, has 4 copper layers and is 1.5842 mm thick.
How many components are on the Keyword bottom?
34 components, from 23 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 bottom design files?
From the notaroomba/keybytes repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.
Can I use the Keyword bottom 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.
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