2 layers363.5 × 84 mm
2 layers34 × 47 mm
Just split
semicontinuity/embedded1Embedded projects
- Size
- 34 × 47 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 7
- Nets
- 27
- Pads
- 80
- Tracks, vias
- 124, 5
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 28 Jun 2012
- Updated
- 8 Sep 2026
Overview
Just split is an open-source printed circuit board by semicontinuity, from the semicontinuity/embedded repository on GitHub. It is a 2-layer board of 34 × 47 mm with 7 parts on 27 nets, routed with 124 tracks and 5 vias.
It is built around the ATMEGA88-20PU. Its parts include 5 connectors, 1 capacitor and 1 IC. It belongs with the AVR (ATmega, ATtiny) boards of this library.
Main components
1README
README.mdEmbedded projects.
Projects for AVR microcontrollers.
- Primitive alarm
- Primitive terminal
- Voltage relay
- Mood lamp - firmware under development
- Primitive motion sensor controller, that works in pair with primitive alarm
- Servo controller - unfinished, no firmware yet
- LED dimmer, controlled via CAN bus
- CAN bus router - firmware under development
- Roller shutter controller, controlled via CAN bus
- Humidity meter
Parts
7| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | Conn_02x05_Odd_Even | Connector_PinHeader_2.54mm:PinHeader_2x05_P2.54mm_Vertical | J3, J4 |
| 2 | Conn_02x06_Odd_Even | Connector_PinSocket_2.54mm:PinSocket_2x06_P2.54mm_Vertical | J2, J5 |
| 1 | 0.1 | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C1 |
| 1 | ATmega88-20PU | Package_DIP:DIP-28_W7.62mm | U1 |
| 1 | MJ-4PP-9 | kbd:MJ-4PP-9_1side | J1 |
Questions
How big is the Just split PCB?
It measures 34 × 47 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Just split use?
7 parts, built around the ATMEGA88-20PU. 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 Just split KiCad files?
From the semicontinuity/embedded repository on GitHub, at the commit this page was made from: the board is target/future-kb/hardware/v2/just-split.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Just split design in my own project?
Its repository states no licence, so its author keeps all rights: ask semicontinuity before reusing the design.
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