ESP32-P4
Enough performance for the round UI while remaining a manageable embedded platform.
CarScreen.
Add-on display for the Seat Mii.
CarScreen is a round add-on display for my Seat Mii. It shows the OVMS data missing from the stock cockpit—while driving and while charging.
StatusIn daily useInstalled in the Seat Mii
StackESP32-P4 · LVGLOVMS · WebSocket · C
MountBrodit + customAluminium adapter plate
Budgetca. 120–150 €Display, mount, 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 (external website). 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.
Everyday display
Driving and charging data at a glance.
The display connects to the OVMS Wi-Fi automatically on startup. While driving it shows speed, state of charge, battery temperature, and current power. During charging, current charge power and the charging curve take priority.
Speed86km/h
SOC52%
Battery9°C
Power13kW
Charging viewCurrent power · charging curve
Technology
Build and components.
OVMS
Existing vehicle data over local Wi-Fi—without an additional cloud or another CAN intervention.
LVGL
Themes, typography, and instruments remain in the codebase.
Mount
A Brodit ProClip and aluminium plate mount the display without a suction cup.
Open Source · MIT
Code and build details are public.
The GitHub repository contains the code along with notes on the hardware, build, and installation. Anyone building a similar display can start there and adapt the solution to their own vehicle.
GitHub RepositoryA similar prototype for your vehicle?
Send me a few details. I’ll assess feasibility and prepare an individual, non-binding quote.
[email protected]