Not a render—the installation is in use.
All projects Open source · personal build story A personal EV display.
A personal EV display.
Built for exactly one car.
CarScreen is not a universal infotainment product. It is my round add-on display for the Seat Mii—with the OVMS values missing from the stock cockpit and an interface that makes driving feel a little more like NFS Underground 2.
OVMS · WebSocket · C
Aluminium adapter plate
Display, mount, and materials
Why build it?
The useful data already existed—just not where I needed it.
The idea came from the small auxiliary screens built by Garage Tinkering. What caught me was not only the look but the possibility of tailoring a display completely to one vehicle.
On longer drives, the Mii mainly lacks a permanently visible state-of-charge value, battery temperature, and current power. OVMS already exposes that data locally. CarScreen does not create another data platform—it simply creates a better view.
Captured in the car
The moment an idea became part of the car.
The display connects to the OVMS Wi-Fi on startup and then shows speed, state of charge, battery temperature, and power in real time. It follows the vehicle state when waking and sleeping.
Speed86km/h
SOC52%
Battery9°C
Power13kW
Evolution
Four decisions shaped the project.
The path was less linear than the finished UI. These four steps explain why the current solution looks the way it does.
- 01
Inspiration
Garage Tinkering showed how much character an auxiliary vehicle display can have.
- 02
Utility
The Seat Mii lacked permanently visible values such as state of charge and battery temperature.
- 03
Technology
ESP32-P4, LVGL, and OVMS became the pragmatic, fully local foundation.
- 04
Installation
A Brodit ProClip and custom aluminium plate turned the prototype into a vehicle component.
Technology
Pragmatic, local, and repairable.
ESP32-P4
Enough performance for a fluid round UI while remaining a manageable embedded platform.
OVMS
Existing vehicle data over local Wi-Fi—no new cloud and no additional CAN intervention.
LVGL
Themes, typography, and instruments stay in code rather than a closed display editor.
Custom mount
A Brodit ProClip and aluminium plate hold the display without a suction cup or meaningful view obstruction.
Safety before show
The shown mount uses a vehicle-specific ProClip. Position, mounting, cable routing, and distraction must be assessed for every car. CarScreen does not replace any stock instrument.
MIT
Open source as workshop notes, not a finished kit.
Code, hardware decisions, and build notes are public. The repository is a useful source for ideas and forks, but not a plug-and-play guarantee for another vehicle.
GitHub Repository