ZHA: Setting offsets for temperature and humidity, turn off the display, measurement interval #30
Description
HA Core 2025.3.0
For firmware version 0.1.2.1+
ClusterID: 0x0204 (Thermostat User Interface Configuration)
Attr: 0x0100, INT16 (id:0x29), Temperature offset, in 0.01° steps, range: -32767 (-327.67°)..32767(+327.67°). Default 0.
Attr: 0x0101, INT16 (id:0x29), Humidity offset, in 0.01% steps, range: -32767 (-327.67%)..32767(+327.67%). Default 0.
Attr: 0x0106, ENUM8 (id:0x30), Turn off the display. 1 - Display Off. Default 0 - Display On.
Attr: 0x0107, UINT8 (id:0x20), Measurement interval, step 1 second, range: 3..255 seconds. Default 10 seconds.
- Not on all HW variants, turning off the display leads to a significant reduction in consumption. Better results are obtained by increasing the measurement interval.
LYWSD03MMC uses 4 display controller options. Not all types of display controllers have a shutdown command.
Only for the controller in HW B1.9 there is documentation and a complete shutdown works for it.
The version is determined by the addresses of the display and sensor on I2C
| HW | LCD I2C addr | SHTxxx I2C addr | Note |
|---|---|---|---|
| B1.4 | 0x3C (IST3055NA0) | 0x70 (SHTC3) | |
| B1.5 | UART! (Special MCU?) | 0x70 (SHTC3) | |
| B1.6 | UART! (Special MCU?) | 0x44 (SHT4x) | |
| B1.7 | 0x3C | 0x44 (SHT4x) | Test original string HW |
| B1.9 | 0x3E (analogue BU9792FUV) | 0x44 (SHT4x) | |
| B2.0 | 0x3C | 0x44 (SHT4x) | Test original string HW |
Version 1.7 or 2.0 is determined at first run by reading the HW line written in Flash.
Display matrices or controllers are different for all versions, except B1.7 = B2.0.
For firmware version 0.1.1.7 - 0.1.2.0
ClusterID: 0x0204 (Thermostat User Interface Configuration)
Attr: 0x0100, INT8 (id:0x28), Temperature offset, in 0.01° steps, range: -127 (-12.7°)..127 (+12.7°). Default 0.
Attr: 0x0101, INT8 (id:0x28), Humidity offset, in 0.01% steps, range: -127 (-12.7 %)..(+12.7 %). Default 0.
Offset for temperature.
Offset for humidity.
