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>
26 lines
1.4 KiB
Markdown
26 lines
1.4 KiB
Markdown
# OBD Display (2024 experiments)
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Leftovers of the earlier attempt to show car speed from an ELM327 on the JC3636W518.
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The 2024 design needed a second (classic) ESP32 as a Bluetooth-Classic → WiFi bridge; that bridge, the ELMulator
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and the WiFi speed sketch were removed on 2026-10-23 (still in git history) — the ELM327 is now read directly over BLE,
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see `../12-OBD-Speed`.
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## Projects (PlatformIO, LVGL 9.6.0, shared library in `../shared`)
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| Folder | What it does |
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| `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. |
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| `display_gif_sd/` | `wallpaper.gif` from the SD card, loaded into PSRAM once and played from memory (~15 fps for the current file). |
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| `assets/gifs/` | GIF files (`dump/` = unused collection) |
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| `_archive/lvgl9_broken/` | Unfinished 2024 LVGL 9 port, does not compile |
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## Build / upload
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```
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pio run -d display_gif_embedded -t upload # flash (COM21)
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pio device monitor -d display_gif_embedded # serial: FPS / refresh / other / CPU once per second
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```
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(`pio` = `%USERPROFILE%\.platformio\penv\Scripts\pio.exe` if not on PATH.)
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## Notes
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- `display_gif_embedded/src/montserrat_100.c` (100 px digits font, 1 bpp) is present but not used.
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- `display_gif_sd` returns early in `setup()` if the SD card fails to mount (black screen).
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