Custom devices (DiY) LYWSD03MMC


Model	LYWSD03MMC
Vendor	Custom devices (DiY)
Description	Xiaomi temperature & humidity sensor with custom firmware
Exposes	battery, temperature, humidity, temperature_display_mode, show_smiley, enable_display, temperature_calibration, humidity_calibration, comfort_temperature_min, comfort_temperature_max, comfort_humidity_min, comfort_humidity_max, linkquality
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Notes

Originally this device does not support Zigbee (only Bluetooth). To use this device with Zigbee2MQTT a custom firmware has to be flashed which is explained hereopen in new window. This firmware converts the device from Bluetooth to Zigbee.

OTA updates

This device supports OTA updates, for more information see OTA updates.

Options

How to use device type specific configuration

temperature_calibration: Calibrates the temperature value (absolute offset), takes into effect on next report of device. The value must be a number.
temperature_precision: Number of digits after decimal point for temperature, takes into effect on next report of device. This option can only decrease the precision, not increase it. The value must be a number with a minimum value of 0 and with a with a maximum value of 3
humidity_calibration: Calibrates the humidity value (absolute offset), takes into effect on next report of device. The value must be a number.
humidity_precision: Number of digits after decimal point for humidity, takes into effect on next report of device. This option can only decrease the precision, not increase it. The value must be a number with a minimum value of 0 and with a with a maximum value of 3

Exposes

Battery (numeric)

Remaining battery in %. Value can be found in the published state on the battery property. To read (/get) the value publish a message to topic zigbee2mqtt/FRIENDLY_NAME/get with payload {"battery": ""}. It's not possible to write (/set) this value. The minimal value is 0 and the maximum value is 100. The unit of this value is %.

Temperature (numeric)

Measured temperature value. Value can be found in the published state on the temperature property. To read (/get) the value publish a message to topic zigbee2mqtt/FRIENDLY_NAME/get with payload {"temperature": ""}. It's not possible to write (/set) this value. The unit of this value is °C.

Humidity (numeric)

Measured relative humidity. Value can be found in the published state on the humidity property. To read (/get) the value publish a message to topic zigbee2mqtt/FRIENDLY_NAME/get with payload {"humidity": ""}. It's not possible to write (/set) this value. The unit of this value is %.

Temperature display mode (enum)

The units of the temperature displayed on the device screen.. Value can be found in the published state on the temperature_display_mode property. To read (/get) the value publish a message to topic zigbee2mqtt/FRIENDLY_NAME/get with payload {"temperature_display_mode": ""}. To write (/set) a value publish a message to topic zigbee2mqtt/FRIENDLY_NAME/set with payload {"temperature_display_mode": NEW_VALUE}. The possible values are: celsius, fahrenheit.

Show smiley (binary)

Whether to show a smiley on the device screen.. Value can be found in the published state on the show_smiley property. To read (/get) the value publish a message to topic zigbee2mqtt/FRIENDLY_NAME/get with payload {"show_smiley": ""}. To write (/set) a value publish a message to topic zigbee2mqtt/FRIENDLY_NAME/set with payload {"show_smiley": NEW_VALUE}. If value equals SHOW show smiley is ON, if HIDE OFF.

Enable display (binary)

Whether to turn display on/off.. Value can be found in the published state on the enable_display property. To read (/get) the value publish a message to topic zigbee2mqtt/FRIENDLY_NAME/get with payload {"enable_display": ""}. To write (/set) a value publish a message to topic zigbee2mqtt/FRIENDLY_NAME/set with payload {"enable_display": NEW_VALUE}. If value equals ON enable display is ON, if OFF OFF.

Temperature calibration (numeric)

The temperature calibration offset is set in 0.01° steps.. Value can be found in the published state on the temperature_calibration property. To read (/get) the value publish a message to topic zigbee2mqtt/FRIENDLY_NAME/get with payload {"temperature_calibration": ""}. To write (/set) a value publish a message to topic zigbee2mqtt/FRIENDLY_NAME/set with payload {"temperature_calibration": NEW_VALUE}. The minimal value is -100 and the maximum value is 100. The unit of this value is °C.

Humidity calibration (numeric)

The humidity calibration offset is set in 0.01 % steps.. Value can be found in the published state on the humidity_calibration property. To read (/get) the value publish a message to topic zigbee2mqtt/FRIENDLY_NAME/get with payload {"humidity_calibration": ""}. To write (/set) a value publish a message to topic zigbee2mqtt/FRIENDLY_NAME/set with payload {"humidity_calibration": NEW_VALUE}. The minimal value is -100 and the maximum value is 100. The unit of this value is %.

Comfort temperature min (numeric)

Comfort parameters/Temperature minimum, in 0.01°C steps.. Value can be found in the published state on the comfort_temperature_min property. To read (/get) the value publish a message to topic zigbee2mqtt/FRIENDLY_NAME/get with payload {"comfort_temperature_min": ""}. To write (/set) a value publish a message to topic zigbee2mqtt/FRIENDLY_NAME/set with payload {"comfort_temperature_min": NEW_VALUE}. The minimal value is -100 and the maximum value is 100. The unit of this value is °C.

Comfort temperature max (numeric)

Comfort parameters/Temperature maximum, in 0.01°C steps.. Value can be found in the published state on the comfort_temperature_max property. To read (/get) the value publish a message to topic zigbee2mqtt/FRIENDLY_NAME/get with payload {"comfort_temperature_max": ""}. To write (/set) a value publish a message to topic zigbee2mqtt/FRIENDLY_NAME/set with payload {"comfort_temperature_max": NEW_VALUE}. The minimal value is -100 and the maximum value is 100. The unit of this value is °C.

Comfort humidity min (numeric)

Comfort parameters/Humidity minimum, in 0.01% steps.. Value can be found in the published state on the comfort_humidity_min property. To read (/get) the value publish a message to topic zigbee2mqtt/FRIENDLY_NAME/get with payload {"comfort_humidity_min": ""}. To write (/set) a value publish a message to topic zigbee2mqtt/FRIENDLY_NAME/set with payload {"comfort_humidity_min": NEW_VALUE}. The minimal value is 0 and the maximum value is 100. The unit of this value is %.

Comfort humidity max (numeric)

Comfort parameters/Humidity maximum, in 0.01% steps.. Value can be found in the published state on the comfort_humidity_max property. To read (/get) the value publish a message to topic zigbee2mqtt/FRIENDLY_NAME/get with payload {"comfort_humidity_max": ""}. To write (/set) a value publish a message to topic zigbee2mqtt/FRIENDLY_NAME/set with payload {"comfort_humidity_max": NEW_VALUE}. The minimal value is 0 and the maximum value is 100. The unit of this value is %.

Linkquality (numeric)

Link quality (signal strength). Value can be found in the published state on the linkquality property. It's not possible to read (/get) or write (/set) this value. The minimal value is 0 and the maximum value is 255. The unit of this value is lqi.

# Custom devices (DiY) LYWSD03MMC

# Notes

# OTA updates

# Options

# Exposes

# Battery (numeric)

# Temperature (numeric)

# Humidity (numeric)

# Temperature display mode (enum)

# Show smiley (binary)

# Enable display (binary)

# Temperature calibration (numeric)

# Humidity calibration (numeric)

# Comfort temperature min (numeric)

# Comfort temperature max (numeric)

# Comfort humidity min (numeric)

# Comfort humidity max (numeric)

# Linkquality (numeric)