2 layers173.8 × 125 mm
Hand
DaveMcEwan/mcdox
mcdox - Mechanical Computer Keyboard ====================================
47 parts6MIT
2 layers50 × 50 mm
mcdox - Mechanical Computer Keyboard ====================================
- Size
- 50 × 50 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 16
- Nets
- 32
- Pads
- 111
- Tracks, vias
- 252, 24
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 2 Nov 2014
- Updated
- 24 Mar 2023
Overview
Ctrl is an open-source printed circuit board by DaveMcEwan, from the DaveMcEwan/mcdox repository on GitHub, published under the MIT licence. It is a 2-layer board of 50 × 50 mm with 16 parts on 32 nets, routed with 252 tracks and 24 vias.
Its parts include 8 resistors, 1 IC and 1 switch. It belongs with the AVR (ATmega, ATtiny) boards of this library.
README
README.mdmcdox - Mechanical Computer Keyboard
Layout is similar to than of the Ergodox project, but in a unibody case.
Subdirectories
- case - Lasercut design produced by exporting SVGs from KiCAD.
- doc - Documents like datasheets stored for handy reference.
- keycap - STL model generator written in OpenSCAD suitable for FDM printing.
Generated models are tracked in
keycap/stlbecause it takes a while (~10 minutes) to generate them. - pcb/ctrl - TODO Breakout PCB for connecting controller to switch grids.
- pcb/hand - Reversible PCB which connects the switches in a grid.
- 38 buttons distributed over 5 rows, 8 columns.
- Lengths beside mounting holes (6mm, 15mm, 25mm) are for standoffs to achieve a tenting.
- Connect to control board with 15 core, 1mm pitch FFC-FPC cable. https://www.te.com/usa-en/product-1-84953-5.html https://www.digikey.com/en/products/detail/te-connectivity-amp-connectors/1-84953-5/2567541 https://uk.farnell.com/amp-te-connectivity/1-84953-5/connector-ffc-fpc-15pos-1rows/dp/3398659 https://uk.farnell.com/multicomp-pro/mp-ffca10150503a/ffc-cord-15p-same-side-50mm-wht/dp/3385337 https://uk.farnell.com/multicomp-pro/mp-ffca10151003a/ffc-cord-15p-same-side-100mm-wht/dp/3385339
- Low level lighting with LED on top and/or bottom, depending how the case looks.
- All diodes (1N4148 compatible), LEDs, and resistors are 0603 (imperial).
- release - Stuff that's actually been manufactured.
BOM
- Keycaps - The functionally simplest parts which are also the most difficult to source. 18x 1.5u, 56x 1u
- Case - Standard 3mm acrylic from laser cutter.
- PCBs - 1.2mm FR4, 2-layer, 0.15mm width/clearance 2x mcdoxHand, 1x mcdoxCtrl
- Switches - CherryMX, or compatible like Gateron, Kailh. 74x
- Diodes - 1 per switch. 74x
- Microcontroller - Arduino Pro Micro from Sparkfun, or clone.
- FPC connectors 4x
- FPC cables - Connect hand PCBs to central controller.
- LEDs - 0603 footprint 2x
- Resistors - For LEDs and switch matrix. 10x 220R 0603
- Pushbutton - For putting Arduino Pro Micro into programming mode. 1x
Parts
16| Qty | Value | Footprint | References |
|---|---|---|---|
| 8 | 220 | ctrl:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R0, R1, R2, R3, R4, R5, R6, R7 |
| 2 | Conn_01x15 | ctrl:TE_1-84953-5_1x15-1MP_P1.0mm_Horizontal | Jleft1, Jright1 |
| 1 | ArduinoProMicro | ctrl:ArduinoProMicro | U1 |
| 1 | Conn_02x03_Odd_Even | Connector_PinHeader_2.54mm:PinHeader_2x03_P2.54mm_Vertical | ICSP |
| 1 | SW_Push | Button_Switch_SMD:SW_SPST_TL3342 | SW1 |
The 13 most common of 16 parts.
Questions
How big is the Ctrl PCB?
It measures 50 × 50 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Ctrl use?
16 parts. 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 Ctrl KiCad files?
From the DaveMcEwan/mcdox repository on GitHub, at the commit this page was made from: the board is pcb/ctrl/ctrl.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Ctrl design in my own project?
Its repository publishes it under the MIT 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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