2 layers45.7 × 31.8 mm
LEDx16 board
tardate/LittleArduinoProjects
a collection of "Little Electronic & Arduino Projects", most involving electronics or an Arduino in one way or another!
36 parts803MIT
2 layers170 × 68 mm
Bancouver40 cfx
ChrisChrisLoLo/babbit3640A 36 key wireless ortholinear keyboard
- Size
- 170 × 68 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 83
- Nets
- 67
- Pads
- 417
- Tracks, vias
- 422, 85
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 18 Dec 2022
- Updated
- 21 Apr 2024
Overview
Bancouver40 cfx is an open-source printed circuit board by ChrisChrisLoLo, from the ChrisChrisLoLo/babbit36 repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 170 × 68 mm with 83 parts on 67 nets, routed with 422 tracks and 85 vias.
It is built around the 74HC595. Its parts include 37 switches, 36 diodes, 2 ICs and 2 connectors. It belongs with the keyboards and input and robots and motor control boards and the nRF52 and nRF5x boards of this library.
Main components
1README
README.mdbabbit36
A 36 key low profile wireless ortholinear board. Uses a Seediuno XIAO as the MCU, and runs on ZMK. Featues:
- Low Profile, uses CFX keycaps
- Commodity parts, only non standard part is the shift register
- Relatively affordable!
- Case only requires one CNC/3D Printed part and one FR4 backplate
Note
This keyboard uses CFX spacing, and therefore requires Chosfox CFX keycaps, or keycaps with similar spacing.
Status
v0 is functional and works as is!
PCB/CNC case
You can generate the gerbers from source in the pcb directory, and send off imediately to PCBWay or the like. There's one gerber for the keyboard and another gerber for the backplate of the case. There's also step files ready to use to order your own 3DP/CNC case. My CNC case was sponsored by PCBWay. I was a bit anxious about my CNC file since this is my most complicated keyboard case to date, but PCBWay did a fantastic job! I was very happy that the tolerances were good, that the finishing looked great, and that it was all at a great price given the complexity of the case! I highly recommend their services for CNC prototyping/manufacturing!
BOM
The following is the materials you will want/need to make your own babbit36. Note that anything amount after a + denotes the rough amount of spares you may want to have when ordering the parts.
| Part | Count | Notes |
|---|---|---|
| PCB | 1 | |
| Kailh Choc Hotswap Switches | 36+4 | |
| LL4148 SMD Diodes | 36+4 | This board uses SMD diodes exclusively. I found though-hole diodes often easily slipped around in a way such that the board was no longer able to fit inside the case |
| Seeduino XIAO nrf52 | 1 | |
| 74hc595 SMD | 1 | SMD Shift Register |
| SMD power switch | 1 | |
| Lipo battery | 1 | A 3.7V 110mAh 301230 will fit nicely in the case |
| Rubber Feet | 6+2 | Any should generally work, though I'm using ~2.5mm thick ones, as they give more space for screw heads, as well as the magnetic connector I'm using |
| CNC Printed Case | 1 | You could use PCB printing services like PCBWay to make one in resin, though I haven't confirmed if they'd be durable enough to survive in transit |
| PCB/FR4 backplate | 1 | For the back of the keyboard case. Can be found in the pcb folder |
| M2 4mm Screw | 6+2 | Screws for the PCB and case. Be careful of the size of the screw head! the flatter the better! |
Parts
83| Qty | Value | Footprint | References |
|---|---|---|---|
| 36 | D_Small | Diode_SMD:D_MiniMELF_Handsoldering | D1, D2, D10, D11, D12, D13, D14, D15, D16, D17, D18, D19, D20, D21, D22, D23 +20 |
| 36 | SW_Push | keyswitches:Kailh_socket_PG1350 | SW1, SW2, SW10, SW11, SW12, SW13, SW14, SW15, SW16, SW17, SW18, SW19, SW20, SW21, SW22, SW23 +20 |
| 6 | MountingHole | MountingHole:MountingHole_4mm | H1, H2, H3, H4, H5, H6 |
| 1 | 74HC595 | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U2 |
| 1 | Conn_01x02_Female | Connector_JST:JST_PH_S2B-PH-K_1x02_P2.00mm_Horizontal | J1 |
| 1 | Conn_01x02_Female | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J2 |
| 1 | SW_SPST | Button_Switch_SMD:SW_SPDT_PCM12 | SW41 |
| 1 | xiao-ble | mcu:xiao-ble-smd | U1 |
Questions
How big is the Bancouver40 cfx PCB?
It measures 170 × 68 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Bancouver40 cfx use?
83 parts, built around the 74HC595. 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 Bancouver40 cfx KiCad files?
From the ChrisChrisLoLo/babbit36 repository on GitHub, at the commit this page was made from: the board is pcb/bancouver40_cfx/bancouver40_cfx.kicad_pcb and its schematic pcb/babbit_bottom/babbit_bottom/babbit_bottom.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Bancouver40 cfx 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).
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