LILYGO T-Display-S3 wireless monitor for Battery Emulator (ESP-NOW)

[sort282-rgb]

Hi,

I built an independent wireless monitor for Battery Emulator using the LILYGO T-Display-S3.

The display receives live Battery Emulator data over ESP-NOW and provides four information screens, including system status, power/current/voltage/SOC, battery capacity information, and a cell-voltage graph with minimum/maximum cells and delta.

Features

• Wireless ESP-NOW connection — no router required
• Four switchable information screens
• Phone-based first-time setup
• USB web installer with progress indication
• Web controls for brightness, start screen, theme and SOC badge
• Connection and Battery Emulator status diagnostics
• Source code and prebuilt firmware are public

Links

• Web installer
• Source code and screenshots
• Installation and usage Wiki

This is an independent community project and is not part of the official Battery Emulator firmware. It is intended as an optional external display and does not modify Battery Emulator control logic.

If the maintainers consider it useful, I would be happy to add a short installation page or project link to the Battery Emulator Wiki.

[dalathegreat]

Excellent work @sort282-rgb 🙌

It would be great if you could link to your repo and add more info. Here is the place: https://github.com/dalathegreat/Battery-Emulator-Wiki/blob/main/docs/setup/software/espnow.md#supported-espnow-projects

I also updated the main hardware page to make ESPNow a bit more visible: https://dalathegreat.github.io/Battery-Emulator-Wiki/hardware/#optional-screen-via-espnow

[sort282-rgb]

Thank you! I added the project to the Supported ESPNow projects section and opened pull request #28:

dalathegreat/Battery-Emulator-Wiki#28

I also updated the project README and Wiki with cropped screenshots, installation details, hardware links, and troubleshooting information.

[nagyrobi]

Wonderful!

I would suggest a 5th page, the events table. ESPNow broadcasts always the latest 10 events so you can list them as they come in. No need to cache anything.

[sort282-rgb]

Thank you for the suggestion — implemented in firmware 12.3. It adds a separate fifth EVENT LOG page showing up to the latest 10 ESP-NOW events with severity colors. The existing system-status page remains unchanged.

Repository and web installer:
https://github.com/sort282-rgb/battery-display-t-display-s3

[sort282-rgb]

I spent three days working on the 480x480 display version, but at some point, everything broke. I do have the source code for a working ESP-NOW version, though. I can share it as a test version—for reference and study—if you're interested.