6 layers160 × 120 mm
Pic32main
JuanPoueriet/automatic-spork
Máquina de ruleta física de casino. 6 PCBs: pic32main (cerebro), wheel (rueda de LEDs), displaysa/b/c (paneles de 7 segmentos en cascada) y buttons (botonera).
256 parts
2 layers266 × 76 mm
CHORD ZERO Stenographic Keyboard
- Size
- 266 × 76 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 75
- Nets
- 68
- Pads
- 288
- Tracks, vias
- 241, 19
- Pours
- 3
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 18 Aug 2022
- Updated
- 27 Aug 2022
Overview
Zero is an open-source printed circuit board by stenobase, from the stenobase/chord-zero repository on GitHub. It is a 2-layer board of 266 × 76 mm with 75 parts on 68 nets, routed with 241 tracks and 19 vias.
It is built around the 1N4148W, SK6812MINI-E and P6SMB6.8A. Its parts include 33 diodes, 30 switches and 1 IC. It belongs with the keyboards and input boards and the RP2040 boards of this library.
Main components
3
1N4148W
SOD-123150mA 1A 1V@50mA 1uA@75V 400mW 4ns 75V Independent SOD-123 Switching Diodes ROHSSTMicroelectronicsSwitching Diodes
SK6812MINI-E
SMD-40℃~+85℃ 0.6mA 1.78mm 120mcd~240mcd 120° 160mcd~320mcd 1kHz 2.8mm 2000V 3.2mm 3.7V~5.5V 460nm~470nm 515nm~525nm 620nm~625nm 800Kbit/s 815mcd~1275mcd Semi-transparent lens SMD RGB LEDs(Built-in IC) ROHSOPSCO OptoelectronicsRGB LEDs(Built-In IC)
P6SMB6.8A
DO-214AA(SMB)-55℃~+150℃ 10.5V 1mA 5.8V 57.1A 6.45V 600W@10/1000us TVS Unidirectional DO-214AA(SMB) ESD and Surge Protection (TVS/ESD) ROHSFTRESD And Surge Protection (TVS/ESD)
README
README.md
CHORD ZERO Stenographic Keyboard
CHORD ZERO is a stenographic keyboard that can be used with Plover or any other application that supports the TX Bolt or GeminiPR protocol.
Build your own
Create gerber files and order a PCB
The easiest way to create gerber files is with
KiKit; and the easiest way to install
KiKit is with pipx:
$ pipx install kikit --system-site-packages
$ kikit fab <your_fab_of_choice> zero.kicad_pcb gerbersThis creates gerbers/gerbers.zip. Use this file to order PCBs the same way
as you would usually do.
Assembly
You will need the following parts:
- 30x MX compatible switches
- 30x key caps
- 30x
1N4148W(or similar) - 1x Raspberry Pi Pico
- 1x
SMBJ5.0A(or similar) - 2x
SK6812MINI(optional)
You want linear switches with low actuation force. Gateron clears are a good option.
You want key caps that minimize the gap between top and bottom row. Cherry R2/R3 or OEM R3 are good options.
Firmware
Firmware and instructions are available here.
LICENSE
The CHORD ZERO Stenographic Keyboard is open source hardware. You are encouraged to produce your own keyboard based on the documentation and design files of this project. You are also encouraged to study and modify the design and create derivatives.
- All documentation and design files of this project are released under the CERN-OHL-S.
- Some of the used 3D models are licensed under the MIT license.
- The default firmware for this project is QMK. QMK is released under the terms of the GNU General Public License, version 2.
- All contributions to QMK that are specific to this project are released under the same terms as QMK itself.
Parts
75| Qty | Value | Footprint | References |
|---|---|---|---|
| 30 | 1N4148W | footprints:D_SOD-123 | D101, D102, D103, D104, D105, D106, D107, D108, D109, D110, D111, D112, D201, D202, D203, D204 +14 |
| 30 | SW_Push | footprints:CherryMX_1u_snug_fit | SW101, SW102, SW103, SW104, SW105, SW106, SW107, SW108, SW109, SW110, SW111, SW112, SW201, SW202, SW203, SW204 +14 |
| 6 | MountingHole | footprints:M2 Hole | H1, H2, H3, H4, H5, H6 |
| 4 | MountingHole Pico | footprints:M2 Hole Pico | H7, H8, H9, H10 |
| 2 | SK6812MINI | LED_SMD:LED_SK6812MINI_PLCC4_3.5x3.5mm_P1.75mm | D1, D2 |
| 1 | CHORD LOGO | footprints:chord_logo_3d | LOGO_1 |
| 1 | P6SMB6.8A | Diode_SMD:D_SMB_Handsoldering | D4 |
| 1 | Pico | footprints:RPi_Pico_SMD | U1 |
Questions
How big is the Zero PCB?
It measures 266 × 76 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Zero use?
75 parts, built around the 1N4148W, SK6812MINI-E and P6SMB6.8A. 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 Zero KiCad files?
From the stenobase/chord-zero repository on GitHub, at the commit this page was made from: the board is zero.kicad_pcb and its schematic switch.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Zero design in my own project?
Its repository states no licence, so its author keeps all rights: ask stenobase before reusing the design.
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