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SONOFF SNZB-02 #

Model	SNZB-02
Vendor	SONOFF
Description	Temperature and humidity sensor
Exposes	battery, temperature, humidity, voltage, linkquality
Picture
White-label	eWeLink RHK08

Notes #

Pairing #

Long press reset button for 5s until the LED indicator flashes three times, which means the device has entered pairing mode

Reporting intervals #

It has been reported, that the sensor reports humidity changes quite frequently (changes on 2nd digit level), but temperature changes are reported only once per hour or when temperature has changed > ~0.6°C. This results in a staircase development in recorded temperatures and inhibits fine-granular climate control. No resolution is known so far. See also Homeassistant Community Forums

Device type specific configuration #

How to use device type specific configuration

• temperature_precision: Controls the precision of temperature values, e.g. 0, 1 or 2; default 2. To control the precision based on the temperature value set it to e.g. {30: 0, 10: 1}, when temperature >= 30 precision will be 0, when temperature >= 10 precision will be 1.

• temperature_calibration: Allows to manually calibrate temperature values, e.g. 1 would add 1 degree to the temperature reported by the device; default 0.

• humidity_precision: Controls the precision of humidity values, e.g. 0, 1 or 2; default 2. To control the precision based on the humidity value set it to e.g. {80: 0, 10: 1}, when humidity >= 80 precision will be 0, when humidity >= 10 precision will be 1.

Exposes #

Battery (numeric) #

Remaining battery in %. Value can be found in the published state on the battery property. It’s not possible to read (/get) or 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. It’s not possible to read (/get) or 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. It’s not possible to read (/get) or write (/set) this value. The unit of this value is %.

Voltage (numeric) #

Voltage of the battery in millivolts. Value can be found in the published state on the voltage property. It’s not possible to read (/get) or write (/set) this value. The unit of this value is mV.

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.

Manual Home Assistant configuration #

Although Home Assistant integration through MQTT discovery is preferred, manual integration is possible with the following configuration:

sensor:
  - platform: "mqtt"
    state_topic: "zigbee2mqtt/<FRIENDLY_NAME>"
    availability_topic: "zigbee2mqtt/bridge/state"
    value_template: "{{ value_json.battery }}"
    unit_of_measurement: "%"
    device_class: "battery"

sensor:
  - platform: "mqtt"
    state_topic: "zigbee2mqtt/<FRIENDLY_NAME>"
    availability_topic: "zigbee2mqtt/bridge/state"
    value_template: "{{ value_json.temperature }}"
    unit_of_measurement: "°C"
    device_class: "temperature"

sensor:
  - platform: "mqtt"
    state_topic: "zigbee2mqtt/<FRIENDLY_NAME>"
    availability_topic: "zigbee2mqtt/bridge/state"
    value_template: "{{ value_json.humidity }}"
    unit_of_measurement: "%"
    device_class: "humidity"

sensor:
  - platform: "mqtt"
    state_topic: "zigbee2mqtt/<FRIENDLY_NAME>"
    availability_topic: "zigbee2mqtt/bridge/state"
    value_template: "{{ value_json.voltage }}"
    unit_of_measurement: "mV"
    device_class: "voltage"

sensor:
  - platform: "mqtt"
    state_topic: "zigbee2mqtt/<FRIENDLY_NAME>"
    availability_topic: "zigbee2mqtt/bridge/state"
    value_template: "{{ value_json.linkquality }}"
    unit_of_measurement: "lqi"
    icon: "mdi:signal"