2 layers363.5 × 84 mm
2 layers38 × 52.5 mm
Just split
semicontinuity/embedded1Embedded projects
- Size
- 38 × 52.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 67
- Nets
- 44
- Pads
- 120
- Tracks, vias
- 207, 15
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- 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 38 × 52.5 mm with 67 parts on 44 nets, routed with 207 tracks and 15 vias.
It is built around the ATMEGA88-20PU. Its parts include 20 diodes, 1 capacitor, 1 IC and 1 connector. 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
67| Qty | Value | Footprint | References |
|---|---|---|---|
| 44 | TestPoint | Connector_Pin:Pin_D0.9mm_L10.0mm_W2.4mm_FlatFork | TP1, TP2, TP10, TP11, TP12, TP13, TP14, TP15, TP16, TP17, TP18, TP19, TP20, TP21, TP22, TP23 +28 |
| 20 | D | Diode_SMD:D_MiniMELF | D1, D2, D3, D4, D5, D10, D11, D12, D13, D14, D15, D16, D17, D18, D19, D20 +4 |
| 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 38 × 52.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Just split use?
67 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/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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