2 layers78 × 26 mm
ESP32-li ion cell monitor
pcbreflux/espressif
all espressif stuff will committed here
106 parts608GPL-3.0
2 layers231 × 76.2 mm
Contra
homerow-ca/ContraContra - Lowest cost ortholinear keyboard kit possible
- Size
- 231 × 76.2 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 106
- Nets
- 70
- Pads
- 520
- Tracks, vias
- 450, 2
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 7 Feb 2022
- Updated
- 7 Feb 2022
Overview
Contra is an open-source printed circuit board by homerow-ca, from the homerow-ca/Contra repository on GitHub. It is a 2-layer board of 231 × 76.2 mm with 106 parts on 70 nets, routed with 450 tracks and 2 vias.
Its parts include 48 diodes, 1 IC, 1 connector and 1 switch. It belongs with the keyboards and input boards and the AVR (ATmega, ATtiny) boards of this library.
README
README.mdContra
Extremely low cost ortholinear keyboard
The bare minimum for a functional keyboard.
In light of recent claims that I am 100% liable for any of my open source PCBs, I am adding this disclaimer.
I provide these PCBs as a reference for designing keyboard PCBs. Using them within your projects will require a will to do research of one's own and to learn the workings of them, potentially fixing issues if they exist.
I provide these PCBs without liability and without any guarantees regarding functionality, as expressed in the MIT license under which all of these PCBs are licensed.
Features
- 2U or split space.
- All through-hole parts. 48x diodes, 1x Pro Micro.
- Assembled by M2 standoffs and screws.
- Programmable via firmware of choice, such as TMK.
- Nothing fancy. A very nice way to try out some switches, enjoy some DIY, or to test out ortho keyboards.
Parts list
- 48x 1N4148 diodes or similar, THT
- 1x Pro Micro
- 48x Switches
- Optional 1x 2U stabilizer, PCB mount
- One PCB, one plate, and one bottom plate
- 5 M2 8mm standoffs
- 10 M2 screws
Files for production
- Main PCB: Check the latest releases, or grab the latest gerber here.
- Case files: Check the case repo here.
Parts
106| Qty | Value | Footprint | References |
|---|---|---|---|
| 48 | 1N4148 | locallib:D_DO-35_SOD27_P7.62mm_Horizontal-DoubleSided | D1, D2, D10, D11, D12, D13, D14, D15, D16, D17, D18, D19, D20, D21, D22, D23 +32 |
| 48 | MX-1U | MX_Alps_Hybrid:MX-1U-NoLED | MX1, MX2, MX10, MX11, MX12, MX13, MX14, MX15, MX16, MX17, MX18, MX19, MX20, MX21, MX22, MX23 +32 |
| 1 | Conn_01x04 | Pin_Headers:Pin_Header_Straight_1x04_Pitch2.54mm | J1 |
| 1 | LOGO | homerow:homerow_small | G*** |
| 1 | MX-2U | MX_Alps_Hybrid:MX-2U-ReversedStabilizers-NoLED | MX49 |
| 1 | ProMicro | locallib:pro_micro | U1 |
| 1 | SW_PUSH | Molex-0548190589:PushButton_6x6mm_TH_Pretty | SW1 |
The 101 most common of 106 parts.
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Questions
How big is the Contra PCB?
It measures 231 × 76.2 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Contra use?
106 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 Contra KiCad files?
From the homerow-ca/Contra repository on GitHub, at the commit this page was made from: the board is Contra.kicad_pcb and its schematic Contra.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Contra design in my own project?
Its repository states no licence, so its author keeps all rights: ask homerow-ca before reusing the design.