wtf is blueline-one?

BlueLine One is firmware and hardware plans for a custom car gauge that a hobbyist can build themselves. It runs on an ESP32-S3 microcontroller connected to a small round AMOLED touchscreen, and it reads live data from a car's onboard diagnostics port over Bluetooth using a separate BLE OBD-II adapter. The project is described as an early proof of concept, so features and vehicle compatibility are still expected to change. The main screen shows four readings at once: engine RPM with a shift light arc, vehicle speed, throttle position, and intake air temperature. Beyond that combined view, a person can swipe between individual full screen gauges covering RPM, speed, throttle, intake temperature, coolant temperature, battery voltage, a tire pressure display, airflow, estimated fuel economy, and a stopwatch style chronograph. Touch gestures handle navigation and settings, including switching between MPH and KPH, Fahrenheit and Celsius, adjusting shift light trigger points, changing the ring light color around the display, and adjusting brightness. Settings are saved on the device so they persist between uses. Building one requires specific hardware: a particular Waveshare ESP32-S3 round AMOLED display, a compatible BLE OBD-II adapter, and a USB-C power source, with an optional 3D printed mount. It is currently being developed and tested on a 2019 Mazda MX-5 Miata, and while standard OBD-II readings should work on other cars, that has not been confirmed, and some features like tire pressure monitoring may need manufacturer specific commands that only work on certain vehicles. To build the firmware, a person needs the Arduino IDE with the ESP32 board package installed, plus several open source Arduino libraries for the display and power management chips. The README documents exact board settings, wiring folder structure, touch control gestures, the OBD-II commands used for each reading, known limitations such as experimental tire pressure support, and a roadmap of planned features like over the air firmware updates. It carries a clear disclaimer that this is an experimental DIY project not to be relied on for safety critical driving decisions, and it is released under the MIT license.