Contra
About the Contra PCB
Contra is an open source PCB design by ai03-2725, published on GitHub. It is a 2-layer board measuring 231 × 76.2 mm, with 100 components from 6 distinct parts.
Other key parts include the ProMicro. By type, the board carries 49 LEDs, 48 diodes, 1 IC, 1 connector and 1 switch.
It belongs with the keyboards designs in this gallery.
From the project
Contra - Lowest cost ortholinear keyboard kit possible
The bare minimum for a functional keyboard.
Main components on the Contra
Contra bill of materials (BOM)
100 components, 6 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | ProMicro | pro_micro | U1 |
| 1 | Conn_01x04 | Pin_Header_Straight_1x04_Pitch2.54mm | J1 |
| 1 | SW_PUSH | PushButton_6x6mm_TH_Pretty | SW1 |
| 48 | MX-1U | MX-1U-NoLED | MX1, MX2, MX3, MX4, MX5, MX6, MX7, MX8 +40 |
| 1 | MX-2U | MX-2U-ReversedStabilizers-NoLED | MX49 |
| 48 | 1N4148 | D_DO-35_SOD27_P7.62mm_Horizontal-DoubleSided | D1, D2, D3, D4, D5, D6, D7, D8 +40 |
Contra design files
The KiCad project lives in the ai03-2725/Contra repository on GitHub; these links point at the commit this page was built from.
- LayoutContra.kicad_pcb
Contra: common questions
How big is the Contra PCB?
The Contra measures 231 × 76.2 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Contra?
100 components, from 6 distinct parts. The full bill of materials is listed on this page.
Where can I download the Contra design files?
From the ai03-2725/Contra repository on GitHub, which has the KiCad layout; the links under Design files point to each one.
Can I use the Contra design in my own project?
The repository has no license, so all rights stay with ai03-2725. Use it as a reference, and ask the author before reusing the design.
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