2 layers87.8 × 59.8 mm
FreeDeck SMD 2020-02
FreeYourStream/freedeck-hardware
all the stuff you need to build your own FreeDeck
37 parts772
4 layers136.5 × 85.7 mm
3435-right
mcculloughembedded/34351A wired 34 key split keyboard.
- Size
- 136.5 × 85.7 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 66
- Nets
- 59
- Pads
- 292
- Tracks, vias
- 550, 82
- Pours
- 3
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 3 Apr 2025
- Updated
- 4 Apr 2025
Overview
3435-right is an open-source printed circuit board by mcculloughembedded, from the mcculloughembedded/3435 repository on GitHub. It is a 4-layer board of 136.5 × 85.7 mm with 66 parts on 59 nets, routed with 550 tracks and 82 vias.
It is built around the ATMEGA32U4-MU. Its parts include 18 diodes, 18 switches, 9 capacitors, 5 resistors and 2 ICs. It belongs with the keyboards and input boards and the AVR (ATmega, ATtiny) boards of this library.
Main components
1README
readme.mdThe 3435
The 3435 is a 34 key split keyboard inspired by the Clog V3. I have used it daily in a professional setting for more than a year.
Features
- 34 key split
- Low profile - only 18mm from top of keycap to desk (including feet)
- Kailh Choc V1 low profile switches
- MX standard key spacing
- Ortholinear
- Angled columns
- Vertical key staggering
- Pinky cluster
- Two key thumb cluster
- Wired USB-C to PC
- Integrated microcontroller (ATMega32u4)
- Fully enclosed case
Table of Contents
What's With the Name?
3435 is my favourite number. It is the only known number where if one raises each digit to the power of itself, then adds the results, one gets back the original number.
That is
$$3^3 + 4^4 + 3^3 + 5^5 = 3435$$
See Matt Parker's talk for a more in depth discussion.
Parts
66| Qty | Value | Footprint | References |
|---|---|---|---|
| 17 | D | kbd:D3_SMD_v2 | D1, D2, D3, D4, D5, D6, D7, D8, D10, D11, D12, D13, D14, D16, D17, D18 +1 |
| 17 | SW_PUSH | Library:keyboard | SW1, SW2, SW3, SW4, SW5, SW6, SW7, SW8, SW10, SW11, SW12, SW13, SW14, SW15, SW16, SW17 +1 |
| 6 | MountingHole | MountingHole:MountingHole_3.2mm_M3 | H1, H2, H3, H4, H5, H6 |
| 5 | 0u1 | Capacitor_SMD:C_0402_1005Metric | C3, C4, C5, C6, C8 |
| 5 | TestPoint | TestPoint:TestPoint_Pad_D2.0mm | GND1, MISO1, MOSI1, SCK1, VCC1 |
| 2 | 22 | Resistor_SMD:R_0402_1005Metric | R1, R2 |
| 2 | 22p | Capacitor_SMD:C_0402_1005Metric | C1, C2 |
| 2 | 5k1 | Resistor_SMD:R_0402_1005Metric | R3, R4 |
| 1 | 10k | Resistor_SMD:R_0402_1005Metric | R5 |
| 1 | 16MHz | Crystal:Crystal_SMD_SeikoEpson_FA238-4Pin_3.2x2.5mm | X1 |
| 1 | 1u | Capacitor_SMD:C_0603_1608Metric | C7 |
| 1 | 4u7 | Capacitor_SMD:C_0603_1608Metric | C9 |
| 1 | 500mA | Fuse:Fuse_0805_2012Metric | F1 |
| 1 | ATmega32U4-M | Package_DFN_QFN:QFN-44-1EP_7x7mm_P0.5mm_EP5.2x5.2mm | U2 |
| 1 | D_Schottky | Diode_SMD:D_SOD-123F | D15 |
| 1 | MJ-4PP-9 | kbd:MJ-4PP-9_1side | J1 |
| 1 | SW_SPDT | Button_Switch_SMD:SW_SPDT_PCM12 | SW0 |
| 1 | ~ | 3435:usb-mid-mount | U1 |
Questions
How big is the 3435-right PCB?
It measures 136.5 × 85.7 mm and has 4 copper layers, 1.6 mm thick.
What parts does the 3435-right use?
66 parts, built around the ATMEGA32U4-MU. 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 3435-right KiCad files?
From the mcculloughembedded/3435 repository on GitHub, at the commit this page was made from: the board is pcbs/right/3435-right.kicad_pcb and its schematic pcbs/left/3435-left.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the 3435-right design in my own project?
Its repository states no licence, so its author keeps all rights: ask mcculloughembedded before reusing the design.
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