Main
duckyb·urchin
About the Main PCB
Main is an open source PCB design by duckyb, published on GitHub under the MIT license. It is a 2-layer board measuring 221.6 × 89.6 mm, with 84 components from 8 distinct parts.
Other key parts include the nice_nano. By type, the board carries 34 switches, 34 diodes and 2 ICs.
It belongs with the keyboards, displays & leds and power & battery designs in this gallery.
From the project
34 key ZMK keyboard, nice!view, nice!nano & hotswap supported.
I created this design because I wanted to upgrade my Sweep with the fancy nice!view displays. I decided to use the edge design from the Swoop and to make it compatible with Kailh hotswap sockets. This is a strictly wireless-only design, and is only compatible with ZMK / nice!nano. Only Choc v1 switches + Hotswap are supported!
If you enjoy my work, please consider ⭐ starring and/or ❤ sponsoring it.

Main components on the Main
Main bill of materials (BOM)
84 components, 8 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 2 | nice_nano | nice_nano | U1, U2 |
| 4 | MountingHole_Pad | 1pin_Battery | Bat+0, Bat+1, BatGND0, BatGND1 |
| 2 | nice!view | nice_view | Display1, Display2 |
| 4 | M2 Hole | M2_hole_4.2mm | H1, H2, H3, H4 |
| 2 | SW_Push | SW_RESET | RSW0, RSW1 |
| 34 | Kailh-Choc | SW_Hotswap_Kailh_Choc_V1_tweaked | SW1, SW2, SW3, SW4, SW5, SW6, SW7, SW8 +26 |
| 2 | SW_SPDT | smt-slider-switch | SW_POWER0, SW_POWER1 |
| 34 | diode | SMD_Diode_Tiny | D1, D2, D3, D4, D5, D6, D7, D8 +26 |
Main design files
The KiCad project lives in the duckyb/urchin repository on GitHub; these links point at the commit this page was built from.
- Layoutmain.kicad_pcb
- Schematicmain.kicad_sch
Main: common questions
How big is the Main PCB?
The Main measures 221.6 × 89.6 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Main?
84 components, from 8 distinct parts. The full bill of materials is listed on this page.
Where can I download the Main design files?
From the duckyb/urchin repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Main design in my own project?
Yes, under the terms of its MIT license, which duckyb chose for the repository.
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