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Zigbee devices Temperature and humidity sensors

SONOFF SNZB-02D

Temperature and humidity sensor with screen. Works with Zigbee2MQTT with no vendor hub or cloud: it pairs with a Zigbee stick and shows up in Home Assistant.

Vendor
SONOFF
Model
SNZB-02D
Type
Temperature and humidity sensors
Power
battery: an end device, does not extend the mesh
Firmware updates (OTA)
yes, through Zigbee2MQTT

Find it in shops: AliExpress

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What it exposes

FeaturePropertyValuesControl
Batterybattery% · 0…100read only
Temperaturetemperature°Cread only
Humidityhumidity%read only
Comfort temperature mincomfort_temperature_min°C · -10…60settable
Comfort temperature maxcomfort_temperature_max°C · -10…60settable
Comfort humidity mincomfort_humidity_min% · 5…95settable
Comfort humidity maxcomfort_humidity_max% · 5…95settable
Temperature unitstemperature_unitscelsius, fahrenheitsettable
Temperature calibrationtemperature_calibration°C · -50…50settable
Humidity calibrationhumidity_calibration% · -50…50settable

MQTT: state and commands

Zigbee2MQTT publishes the device state to zigbee2mqtt/my_device (my_device is the name you give the device). An example message:

{
  "battery": 87,
  "temperature": 21.6,
  "humidity": 46.2,
  "comfort_temperature_min": 25,
  "comfort_temperature_max": 25,
  "comfort_humidity_min": 50,
  "comfort_humidity_max": 50,
  "temperature_units": "celsius",
  "temperature_calibration": 0,
  "humidity_calibration": 0,
  "linkquality": 120
}

Send commands to zigbee2mqtt/my_device/set:

mosquitto_pub -t zigbee2mqtt/my_device/set -m '{"temperature_units":"fahrenheit"}'

Watch the topics live from the browser: MQTT client.

Home Assistant automation example

Zigbee2MQTT creates Home Assistant entities from the device name. If it is called my_device, an automation in automations.yaml can look like this:

- alias: "Room too warm"
  mode: single
  triggers:
    - trigger: numeric_state
      entity_id: sensor.my_device_temperature
      above: 26
      for: "00:10:00"
  actions:
    - action: notify.notify
      data:
        message: "Temperature above 26 °C"

Check the YAML: YAML checker.

How to pair it

  1. In Zigbee2MQTT click Permit join.
  2. Put the device in pairing mode: usually a long press of the reset button (5–10 s) until the LED blinks; bulbs: switch the power off and on 5–6 times.
  3. Keep the device close to the coordinator or a router while pairing.
  4. Give it a clear name: MQTT topics and Home Assistant entities are built from it.

Exact procedure and model notes: the device page in the Zigbee2MQTT docs. No coordinator yet: coordinator picker.

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