50p spectra6 4 copy

StickyPix

StickyPix is a small, rechargeable e-paper picture frame that lets you send images from a phone or desktop app over Bluetooth Low Energy. The same product family supports a four-gray black-and-white display and a six-color display.

Image gallery

What is in this repository?

StickyPix is developed as a complete hardware and software product:

How it works

1. Choose an image in the Flutter app.
2. Crop, rotate, and adjust the image for the selected device.
3. The app converts the image to the display's limited palette using dithering.
4. The processed framebuffer is sent to the device over BLE.
5. The device refreshes the e-paper panel and returns transfer progress and battery information.

The image pipeline currently supports:

• Four-gray output for the black-and-white display variant.
• Six-color output for black, white, yellow, red, blue, and green.
• Portrait and landscape editing for the six-color device.
• Packed framebuffer transfer sized for the target panel.

Display variants

• Six-color display / Spectra 6 panel
• Black-and-white display panel

The linked vendor pages are the reference parts for the current hardware designs. Check the vendor documentation for the latest availability and electrical specifications before ordering.

JLCPCB fabrication settings

For the current PCB designs, I use the following JLCPCB configuration as the fabrication reference:

Treat this as the current ordering reference, not a guarantee that every board revision uses the same stackup. Recheck the board layer count, dimensions, and JLCPCB options before placing an order.

Enclosure

The enclosure is split into a front bezel, rear shell, inner cardstock/support piece, and kickstand. The repository includes both the editable Blender model and exported STL files.

Repository layout

Images/                         Prototype photos
3D Model/                       Printable enclosure STL files
Hardware/24p_bw_3p5/            Black-and-white KiCad design
Hardware/50p_spectra6_4/        Six-color KiCad design
Firmware/4GrayFinal/             Four-gray Zephyr firmware
Firmware/6ColorFinal/            Six-color Zephyr firmware
Flutter App/frontend/sticky_pix/ Flutter application
Manufacturing/                  Manufacturing files and BOM

Project status

StickyPix is an active hardware prototype. The app, firmware, PCB designs, and enclosure are included for development and iteration; dimensions, pinouts, image timings, and manufacturing outputs may change.

Development notes

The Flutter application is in Flutter App/frontend/sticky_pix. The firmware projects use Zephyr and are kept separate so the four-gray and six-color panel drivers can evolve independently. Build-tool-generated files and local SDK paths should remain uncommitted.