2 layers304.8 × 95.2 mm
LMN
FundamentalFrequency/LMN-3-ECAD
Electrical CAD Files for the LMN-3 Project
106 parts106CC-BY-SA-4.0
2 layers67.8 × 68.2 mm
Lastbraincell
NZX37/lastbraincell- Size
- 67.8 × 68.2 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 14
- Nets
- 42
- Pads
- 101
- Tracks, vias
- 98, 8
- Pours
- 6
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 31 Oct 2026
- Updated
- 3 Nov 2026
Overview
Lastbraincell is an open-source printed circuit board by NZX37, from the NZX37/lastbraincell repository on GitHub. It is a 2-layer board of 67.8 × 68.2 mm with 14 parts on 42 nets, routed with 98 tracks and 8 vias.
It is built around the COM-09032 and DS3231S#. Its parts include 5 connectors, 3 resistors, 2 switches and 1 IC.
Main components
2README
README.mdLastBraincell
An e-paper device with joystick and buttons to write down reminders, a to-do list and basic references(like resistor table) as well as a calendar!
CAD
Everything fits together with 3 M3 screws and heat set inserts.
The lid features holes for the joystick and microsd card.
It has two pieces.
PCB
Parts
14| Qty | Value | Footprint | References |
|---|---|---|---|
| 3 | 10kR | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R4, R5, R6 |
| 3 | MountingHole | MountingHole:MountingHole_3.5mm | H1, H2, H3 |
| 2 | SW_Push | Button_Switch_THT:SW_PUSH_6mm | SW1, SW2 |
| 1 | BOOT | Connector_PinSocket_2.54mm:PinSocket_1x22_P2.54mm_Vertical | J2 |
| 1 | COM-09032 | COM-09032:XDCR_COM-09032 | U1 |
| 1 | Micro_SD_Card_Det1 | Connector_Card:microSD_HC_Molex_104031-0811 | J6 |
| 1 | RESET | Connector_PinSocket_2.54mm:PinSocket_1x22_P2.54mm_Vertical | J4 |
| 1 | ds3231 | Connector_PinSocket_2.54mm:PinSocket_1x04_P2.54mm_Vertical | J3 |
| 1 | e-Paper | Connector_PinSocket_2.54mm:PinSocket_1x08_P2.54mm_Vertical | J1 |
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Questions
How big is the Lastbraincell PCB?
It measures 67.8 × 68.2 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Lastbraincell use?
14 parts, built around the COM-09032 and DS3231S#. 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 Lastbraincell KiCad files?
From the NZX37/lastbraincell repository on GitHub, at the commit this page was made from: the board is PCB/LastBraincell.kicad_pcb and its schematic PCB/LastBraincell.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Lastbraincell design in my own project?
Its repository states no licence, so its author keeps all rights: ask NZX37 before reusing the design.