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 /references for more information

This project uses:

• KiCad
• STM32MX
• Fusion 360

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License

MIT

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notaroomba.dev  ·  GitHub @NotARoomba