ESP32 CYD Standalone Device

[nguyentb19]

Hi everyone,

I built a standalone ESP32-based M18 battery diagnostic device using a CYD (2.8" touchscreen ESP32 board).

The device runs directly from the battery through a DC buck converter. It uses a spud isolator on RX and a logic level converter on TX for communication.

I focused on building a clean and responsive touchscreen GUI with multiple pages, allowing quick and easy access to battery information without needing a PC. The interface is designed to display detailed data in a simple and practical way.

Before this, I also created a desktop GUI version, and this project is a continuation of that idea in a fully portable device.

I’m really happy with how it turned out.

Big thanks to Martin Jansson for the work on the protocol — it made this project possible.

[Abbey-Lubber]

Do you have any links to designs / code?

[homepier-glitch]

GREAT JOB! Question: Did you use a "2.8" TFT Touch Shield for Arduino with Resistive Touch Screen v2 - STEMMA QT / Qwiic" ?