Add visual indicators for the mcu_temp trend series on the /stats page.
Values are stored as deci-°C (tenths of a degree), so all threshold
constants are in that unit (750 = 75 °C, 950 = 95 °C).
Threshold rationale (ESP32-S3 / Heltec V4, internal die temperature,
T_j max = 105 °C per datasheet):
- < 75 °C (< 750): normal, green — comfortable operating range
- 75–95 °C (750–950): elevated, amber — die is running hot,
30 °C below the junction temperature limit
- > 95 °C (> 950): critical, red — 10 °C below the 105 °C
junction limit; sensor accuracy is ±2 °C in this range
- Chart upper bound 125 °C (1250) covers the full sensor measurement
range with headroom
Changes:
- sparkStrokeColor: color the mcu_temp stroke dynamically based on
the most recent data point (green / amber / red)
- sparkGuideValues: draw horizontal guide lines at 75 °C and 95 °C
- sparkBands: shade three background bands (normal / high / critical)
- getTrendSeriesOrder: insert "mcu_temp" at position 2 (after battery
and memory, before RF metrics) when sensors.mcu_temp_c is present
in the summary payload
Valentin V. Bartenev
3854abfd50