patriandClaude Opus 5.5
9cefb9ba75
- Move user sketches to 10-OBD-Display-2024/, one folder per sketch - Keep 2-Program Example/Demo_Arduino vendor-only, single docs/ copy - Remove duplicate screenshots/instructions and ELMulator zip - Archive broken LVGL 9 attempt Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
OBD Display (2024 experiments)
Earlier attempt to show car speed from an ELM327 OBD-II adapter on the JC3636W518. Because the ESP32-S3 has no Bluetooth Classic, the design used a second (classic) ESP32 as a bridge:
ELM327 --(BT Classic SPP)--> classic ESP32 (elm327_wifi_bridge) --(WiFi AP, HTTP /speed)--> JC3636W518 (display_speed_wifi)
Split out of 2-Program Example/Demo_Arduino/ST77916_LVGL_DEMO/ on 2026-10-22. History is in git.
Sketches
| Folder | Runs on | What it does | Was |
|---|---|---|---|
display_speed_wifi/ |
JC3636W518 | GIF background from SD (A:wallpaper.gif) + joins AP ESP32-Access-Point, polls http://192.168.4.1/speed, shows it in a label |
ST77916_LVGL_DEMO/8.4/ |
display_gif_sd/ |
JC3636W518 | GIF from SD (A:wallpaper.gif) + static text label |
ST77916_LVGL_DEMO/working version/ |
display_gif_embedded/ |
JC3636W518 | GIF compiled into firmware (loligod.c, 13.9 MB source). WiFi code commented out. Stops in setup() if no SD card |
ST77916_LVGL_DEMO/ (top level) |
elm327_wifi_bridge/ |
classic ESP32 (not S3) | BT Classic → ELM327 named OBDII (PIN 1234), WiFi AP ESP32-Access-Point / 123456789, serves /speed (kph). Needs esp32 core 2.0.x, ESPAsyncWebServer, ELMduino |
ST77916_LVGL_DEMO/esp23_elm327_to_wifi/ |
elmulator/ |
classic ESP32 | ELMulator library + examples: fake ELM327 over BT/WiFi for testing without a car | ST77916_LVGL_DEMO/ELMulator-master/ |
assets/gifs/ |
— | GIF files (dump/ = unused collection) |
ST77916_LVGL_DEMO/gifs/ |
_archive/lvgl9_broken/ |
— | Unfinished LVGL 9 port, does not compile | ST77916_LVGL_DEMO/9.1/ |
Notes
- Each display sketch carries its own
pincfg.h,scr_st77916.handlv_conf.h. The Arduino LVGL library does not read the sketch'slv_conf.h— the one used isDocuments\Arduino\libraries\lv_conf.h. Copy the sketch's version there before building:display_speed_wifi: LVGL heap 4 MB in PSRAM (ps_malloc)display_gif_sd: LVGL heap 7 MB in PSRAM
montserrat_100.c(100 px digits font) is present but not referenced by any sketch yet.display_gif_embeddedwill not fit the 3 MB "Huge APP" partition withloligod.c; needs a custom partition table or the GIF on SD.- SD-based GIFs use LVGL drive letter
A:, which needs an LVGL filesystem driver configured inlv_conf.h.