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dashboard: add OBD-II coolant polling over CAN

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nick
2026-06-19 02:19:08 -06:00
parent 97e49a5d98
commit 9d75d2c39c
3 changed files with 189 additions and 3 deletions
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docs/dashboard-esp32s3.md
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@@ -311,3 +311,11 @@ The diagnostics overlay shows dashboard version, uptime, heap, WiFi RSSI/IP, Car
- Swipe right from the main dashboard to open Battery Detail.
- Swipe left from Battery Detail to return to the main dashboard.
- Diagnostics remains hidden behind the multi-tap system-card gesture.
## OBD-II Coolant Polling
- Dashboard ESP32-S3 Touch LCD 5B uses onboard CAN/TWAI via GPIO15 CANTX and GPIO16 CANRX.
- First implemented PID is Mode 01 PID 05 coolant temperature.
- Sends standard 11-bit functional request ID `0x7DF` and accepts ECU responses from `0x7E8` through `0x7EF`.
- Diagnostics page shows TWAI state, coolant value, TX/RX counts, and last OBD status.
- Overview coolant gauge shows `--°` until a valid OBD response is received.