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…g leading zero at x.9 - Below -9.9 °C (or °F) the value does not fit the big number with a decimal point, so show_big_number() returned early and the LCD kept the last value. Show whole degrees instead (e.g. -15). - At 100 % humidity show_small_number() returned early for the same reason. Cap the shown value at 99. - 0.9 was shown as ".9": the leading zero was only added below 9. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Two new RAM-only attributes in Thermostat UI Configuration (0x0204): 0x0200 external temperature (int16, 0.01 ºC) and 0x0201 external humidity (uint16, 0.01 %). Writing them makes the LCD show these values instead of the local sensor, e.g. readings from an outdoor weather station. The device keeps reporting its own measurements. - The display refreshes right after the write. - After 30 min without a write the display falls back to the local sensor. The age is counted in the sensor timer because clock_time() wraps every ~268 s. - The values are not in the NV struct, so the saved settings layout is unchanged and nothing changes for devices that never get a write. - Comfort smiley and ºF mode use the shown values. - converters/lywsd03mmc.js exposes both as external_temperature and external_humidity. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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This lets the LCD show values pushed from outside instead of the local sensor, e.g. the readings of a weather station or another sensor, while the device itself keeps reporting its own measurements.
How it works
0x0200external temperature (int16, 0.01 °C) and0x0201external humidity (uint16, 0.01 %).clock_time()wraps every ~268 s.Backward compatibility
zcl_nv_thermostatUiCfg_t, so the saved settings layout doesn't change and existing settings survive the OTA.converters/lywsd03mmc.jsgets two new settings,external_temperatureandexternal_humidity. The README documents the attributes.Testing
This has been running on a real LYWSD03MMC as a patch on top of 1.1.0 (SDK 3.6.8.6), updated over OTA from Zigbee2MQTT and fed every 10 min by a Home Assistant automation. I tested the push, the immediate refresh, and a battery change. This branch is the same change on current master. It builds with the repo Dockerfile (SDK 3.7.2.0), but I haven't flashed that exact build.
This builds on #201 because both change the humidity display line. Please merge that one first, or I can rebase this one if you'd rather take only this one.