2 layers80 × 110 mm
NucDeck Left Controller PCB
dmcke5/NucDeck
The Open Source DIY Handheld Gaming PC!
59 parts561CERN-OHL-S-2.0
2 layers21.9 × 32.2 mm
42 elec
Ccottin/42_elec_poolTwo weeks of bootcamp around designing, building and soldering a PCB
- Size
- 21.9 × 32.2 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 18
- Nets
- 32
- Pads
- 90
- Tracks, vias
- 155, 10
- Pours
- 42
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 25 Nov 2025
- Updated
- 26 Nov 2025
Overview
42 elec is an open-source printed circuit board by Ccottin, from the Ccottin/42_elec_pool repository on GitHub. It is a 2-layer board of 21.9 × 32.2 mm with 18 parts on 32 nets, routed with 155 tracks and 10 vias.
It is built around the ATMEGA328P-AU. Its parts include 6 capacitors, 3 resistors, 3 connectors, 2 diodes and 1 IC. It belongs with the AVR (ATmega, ATtiny) boards of this library.
Main components
1README
Readme.md˚. ✧̣̇.⋆˳.✦ .˚ Bill Of Materials ˚. ✦.˳⋆.✧̣̇. ˚
| Reference | Qty | Value | DNP | Exclude from BOM | Exclude from Board | Footprint | Datasheet | Unit Price | Ext Price |
|---|---|---|---|---|---|---|---|---|---|
| C1,C3,C4 | 3 | 100nF | 42_footprint:Capacitor_100nf | 0.0024 | 0.0072 | ||||
| C2 | 1 | 1uF | 42_footprint:Capacitor_1uf | 0.0049 | 0.0049 | ||||
| C5,C6 | 2 | 12pF | 42_footprint:Capacitor_12pf | 0.0048 | 0.0048 | ||||
| D1 | 1 | Green | 42_footprint:Led_Green | 0.0081 | 0.0081 | ||||
| D2 | 1 | Red | 42_footprint:Led_Red | 0.0032 | 0.0032 | ||||
| J1,J2 | 2 | ~ | 42_footprint:Connector_12_2.54pitch | ||||||
| J3 | 1 | FTDI | 42_footprint:Connector_6_2.54pitch | ||||||
| R1,R3 | 2 | 10K | 42_footprint:Resistance_10k | 0.0011 | 0.0011 | ||||
| R2 | 1 | 330 | 42_footprint:Resistance_330 | 0.0011 | 0.0011 | ||||
| SW1 | 1 | ~ | 42_footprint:Switch | 0.1189 | 0.1189 | ||||
| U1 | 1 | Atmega328P-A | 42_footprint:Atmega328p-au | 1.6088 | 1.6088 | ||||
| Y1 | 1 | 16MHz | 42_footprint:Crystal Oscillator | 0.0662 | 0.0662 |
˚. ✧̣̇.⋆˳.✦ .˚ Pin Layout ˚. ✦.˳⋆.✧̣̇. ˚
+----------------------------+
| [ ]D9 D10[ ] |
| [ ]D8 +---+ D11[ ] |
| [ ]D7 -| U |- D12[ ] |
| [ ]D6 -| N |- D13[ ] |
| [ ]D5 -| I |- A0[ ] |
| [ ]D4 -| C |- A1[ ] |
| [ ]D3 -| O |- A2[ ] |
| [ ]D2 -| R |- A3[ ] |
| [ ]GND -| N |- 5V[ ] |
| [ ]RST +---+ RST[ ] |
| [ ]RXI GND[ ] |
| [ ]TXO RAW[ ] |
| |
| GND GND RAW RXI TXO DTR |
| [ ] [ ] [ ] [ ] [ ] [ ] |
\____________________________/
Parts
18| Qty | Value | Footprint | References |
|---|---|---|---|
| 3 | 100nF | 42_footprint:Capacitor_100nf | C1, C3, C4 |
| 2 | 10K | 42_footprint:Resistance_10k | R1, R3 |
| 2 | 12pF | 42_footprint:Capacitor_12pf | C5, C6 |
| 2 | ~ | 42_footprint:Connector_12_2.54pitch | J1, J2 |
| 1 | 16MHz | 42_footprint:Crystal Oscillator | Y1 |
| 1 | 1uF | 42_footprint:Capacitor_1uf | C2 |
| 1 | 330 | 42_footprint:Resistance_330 | R2 |
| 1 | Atmega328P-A | 42_footprint:Atmega328p-au | U1 |
| 1 | FTDI | 42_footprint:Connector_6_2.54pitch | J3 |
| 1 | Green | 42_footprint:Led_Green | D1 |
| 1 | LOGO | 42_footprint:unicorn | G*** |
| 1 | Red | 42_footprint:Led_Red | D2 |
| 1 | ~ | 42_footprint:Switch | SW1 |
Questions
How big is the 42 elec PCB?
It measures 21.9 × 32.2 mm and has 2 copper layers, 1.6 mm thick.
What parts does the 42 elec use?
18 parts, built around the ATMEGA328P-AU. 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 42 elec KiCad files?
From the Ccottin/42_elec_pool repository on GitHub, at the commit this page was made from: the board is 42_elec.kicad_pcb and its schematic 42_elec.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the 42 elec design in my own project?
Its repository states no licence, so its author keeps all rights: ask Ccottin before reusing the design.
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