AI Monitor: ESP32 desk display for AI usage limits with LVGL v9 arcs and bars

My projects
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Hi everyone,

I’d like to share a small open-source project built with LVGL v9: a desk display that shows the usage limits of AI services such as Claude, ChatGPT, GitHub Copilot and Cursor, as rings or bars with a countdown until each limit resets.

AI Monitor ring view

Hardware: ESP32-2432S028R “Cheap Yellow Display” (2.8", 320 × 240), ILI9341 or ST7789, driven through TFT_eSPI.

The LVGL side

  • LVGL 9.5.0, pinned exactly because of API changes between 9.x minors
  • Ring view built from lv_arc (rotated to start at 12 o’clock, full 360° background), bar view from lv_bar, up to three usage rows per provider
  • A custom 76 px font for the standby clock, shown when the companion app is not connected
  • Portrait and both landscape orientations, light and dark theme
  • Data arrives as JSON over USB serial from a companion app on macOS (Windows as a beta) and is parsed with ArduinoJson

Source (MIT): GitHub - tobymarks/esp32-ai-monitor: Desk display for Claude, ChatGPT, Gemini, Copilot, Cursor and Antigravity usage limits — ESP32 CYD plus a macOS companion app, powered by the CodexBar CLI over USB · GitHub
Step-by-step build guide: https://www.hackster.io/toby-marks/esp32-desk-display-for-claude-and-chatgpt-usage-limits-71d7e3

Feedback on the UI code is very welcome.

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We are thinking a lot how LVGL can help people more with edge AI and other AI related apps. Yours is also a good use case. Thank you for sharing!