4 layers45 × 80 mm
2 layers194.3 × 134.1 mm
Touchpad before crunch
notaroomba/linea9A custom EMR tablet!
- Size
- 194.3 × 134.1 mm
- Copper layers
- 2
- Thickness
- 0.2 mm
- Parts
- 187
- Nets
- 572
- Pads
- 1,182
- Tracks, vias
- 7,177, 682
- Pours
- 3
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 29 Jun 2025
- Updated
- 28 Aug 2026
Overview
Touchpad before crunch is an open-source printed circuit board by notaroomba, from the notaroomba/linea repository on GitHub. It is a 2-layer board of 194.3 × 134.1 mm with 187 parts on 572 nets, routed with 7,177 tracks and 682 vias.
README
README.md
Linea
Project files for a custom EMR tablet from scratch.
Inspired by Project Patchouli.
Key Features • Case & CAD • PCB • BOM • Credits • License
Key Features
- ~500kHz scanning rate
- Large (170x110mm) drawing area
- Bluetooth support (via STM32)
- USB-C for data and charging
Pen(for another version)
Case and CAD
The case includes:
- 3D printed parts: a base and a top cover
- Snap-fit case
Designed in Fusion 360.
PCB
Designed in KiCad. Notable points:
- STM32WB55RGV6TR for bluetooth support
- LiPo battery charging circuit
- USB-C
- 2 ground planes
- FPC touchpad
The PCB has 2 components, the FPC coil grid and the main board.
FPC
Main Board
BOM
| Item | Price (USD) | Source |
|---|---|---|
| FPC Board | 48.67 | JLCPCB |
| Main Board | 207.14 | JLCPCB |
| Test Pen | 12.35 | Aliexpress |
| LiPo 1200mAh | 12.00 | Online Marketplace |
| Subtotal | 280.16 | |
| Shipping | 30.00 | Estimated |
| Total | 310.16 |
Credits
- Project Patchouli
- Flipper Zero
- Check
/referencesfor more information
This project uses:
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License
MIT
notaroomba.dev · GitHub @NotARoomba
Parts
187| Qty | Value | Footprint | References |
|---|---|---|---|
| 184 | Conn_02x03_Odd_Even | footprints:coil_terminal_3p | J10, J11, J100, J101, J102, J103, J104, J105, J106, J107, J108, J109, J110, J111, J112, J113 +168 |
| 3 | Conn_01x26_MountingPin | FPC:Hirose_FH12-26S-0.5SH(55)-FPC_1 | J1, J2, J3 |
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Questions
How big is the Touchpad before crunch PCB?
It measures 194.3 × 134.1 mm and has 2 copper layers, 0.2 mm thick.
What parts does the Touchpad before crunch use?
187 parts. 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 Touchpad before crunch KiCad files?
From the notaroomba/linea repository on GitHub, at the commit this page was made from: the board is hardware/touchpad/touchpad-backups/touchpad_before_crunch.kicad_pcb and its schematic hardware/board/analog.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Touchpad before crunch design in my own project?
Its repository states no licence, so its author keeps all rights: ask notaroomba before reusing the design.