What it exposes
| Feature | Property | Values | Control |
|---|---|---|---|
| CO₂ | co2 | ppm | read only |
| PM2.5 | pm25 | µg/m³ | read only |
| Temperature | temperature | °C | read only |
| Humidity | humidity | % | read only |
| Temperature unit convert | temperature_unit_convert | celsius, fahrenheit | settable |
| Co2 alarm value | co2_alarm_value | ppm · 1000…10000 | settable |
| Pm25 alarm value | pm25_alarm_value | ug/m3 · 10…1000 | settable |
| Alarm ringtone | alarm_ringtone | mute, ringtone_1, ringtone_2, ringtone_3 | settable |
| Alarm state | alarm_state | normal, alarm_co2, alarm_pm25 | read only |
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:
{
"co2": 640,
"pm25": 8,
"temperature": 21.6,
"humidity": 46.2,
"temperature_unit_convert": "celsius",
"co2_alarm_value": 5500,
"pm25_alarm_value": 505,
"alarm_ringtone": "mute",
"alarm_state": "normal",
"linkquality": 120
}
Send commands to zigbee2mqtt/my_device/set:
mosquitto_pub -t zigbee2mqtt/my_device/set -m '{"temperature_unit_convert":"fahrenheit"}'
mosquitto_pub -t zigbee2mqtt/my_device/set -m '{"alarm_ringtone":"ringtone_1"}'
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
- In Zigbee2MQTT click Permit join.
- 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.
- Keep the device close to the coordinator or a router while pairing.
- 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.