patriandClaude Opus 5.5
9e9c0fac68
The ELM327 is read directly over BLE now. Docs updated. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
1.4 KiB
1.4 KiB
OBD Display (2024 experiments)
Leftovers of the earlier attempt to show car speed from an ELM327 on the JC3636W518.
The 2024 design needed a second (classic) ESP32 as a Bluetooth-Classic → WiFi bridge; that bridge, the ELMulator
and the WiFi speed sketch were removed on 2026-10-23 (still in git history) — the ELM327 is now read directly over BLE,
see ../12-OBD-Speed.
Projects (PlatformIO, LVGL 9.6.0, shared library in ../shared)
| Folder | What it does |
|---|---|
display_gif_embedded/ |
GIF compiled into firmware (src/loligod.c, 2.2 MB GIF → 3.5 MB firmware, default_16MB.csv). Plays at full GIF speed (~23.8 fps, 53 % CPU). GIF starts without SD card. |
display_gif_sd/ |
wallpaper.gif from the SD card, loaded into PSRAM once and played from memory (~15 fps for the current file). |
assets/gifs/ |
GIF files (dump/ = unused collection) |
_archive/lvgl9_broken/ |
Unfinished 2024 LVGL 9 port, does not compile |
Build / upload
pio run -d display_gif_embedded -t upload # flash (COM21)
pio device monitor -d display_gif_embedded # serial: FPS / refresh / other / CPU once per second
(pio = %USERPROFILE%\.platformio\penv\Scripts\pio.exe if not on PATH.)
Notes
display_gif_embedded/src/montserrat_100.c(100 px digits font, 1 bpp) is present but not used.display_gif_sdreturns early insetup()if the SD card fails to mount (black screen).