Smol
About the Smol PCB
Smol is an open source PCB design by zzeneg, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 100 × 88.7 mm, with 65 components from 9 distinct parts.
Other key parts include the MCU_rp2040-zero and RollerEncoder_EVQWGD001. By type, the board carries 19 diodes, 18 switches, 18 LEDs, 3 ICs and 2 connectors.
It belongs with the keyboards designs in this gallery.
From the project
Cheap small split keyboard with 36 keys
Small and cheap low profile split keyboard with 36 keys using RP2040 Zero microcontrollers.
- 36 keys - low profile choc switches with hotswap and choc spacing - per-key RGB matrix - Waveshare RP2040 Zero controller - QMK firmware - TRRS connection between splits (can use USB-C instead but not recommended, too low for many cables) - Panasonic EVQWGD001 roller encoder (left side only) or EC11 rotary encoder (both sides)
Main components on the Smol
Smol bill of materials (BOM)
65 components, 9 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 2 | MCU_rp2040-zero | MCU_rp2040-zero-smd | U1, U2 |
| 1 | RollerEncoder_EVQWGD001 | RotaryEncoder_EVQWGD001 | U3 |
| 1 | AudioJack4 | Connector_TRRS-reversible | J1 |
| 1 | USB_C_Receptacle_USB2.0 | Connector_USB-C-mid-mount-ali-reversible-data | J2 |
| 4 | MountingHole | Hole_M2-spacer | H1, H2, H3, H4 |
| 1 | RotaryEncoder_Switch | RotaryEncoder_EC11-reversible | RE1 |
| 18 | Switch | Switch_ChocV1-hotswap-reversible | SW1, SW2, SW3, SW4, SW5, SW6, SW7, SW8 +10 |
| 18 | LED_SK6812MINI-E | LED_SK6812-MINI-E-reversible | LED1, LED2, LED3, LED4, LED5, LED6, LED7, LED8 +10 |
| 19 | D_Small | Diode_1N4148-SOD123-reversible-flip3d | D1, D2, D3, D4, D5, D6, D7, D8 +11 |
Smol design files
The KiCad project lives in the zzeneg/smol repository on GitHub; these links point at the commit this page was built from.
- Layoutpcb/pcb.kicad_pcb
- Schematicpcb/pcb.kicad_sch
Smol: common questions
How big is the Smol PCB?
The Smol measures 100 × 88.7 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Smol?
65 components, from 9 distinct parts. The full bill of materials is listed on this page.
Where can I download the Smol design files?
From the zzeneg/smol repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Smol design in my own project?
Yes, under the terms of its GPL-3.0 license, which zzeneg chose for the repository.
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