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.
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.
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
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.