What it exposes
| Feature | Property | Values | Control |
|---|---|---|---|
| Identify | identify | identify | settable |
| CO₂ | co2 | ppm | read only |
| Temperature | temperature | °C | read only |
| Humidity | humidity | % | read only |
| Voc index | voc_index | VOC Index points | read only |
| Reading interval | reading_interval | seconds · 15…300 | settable |
| Light indicator | light_indicator | — | settable |
| Light indicator level | light_indicator_level | % · 0…100 | settable |
| Set altitude | set_altitude | meters · 0…3000 | settable |
| Temperature offset | temperature_offset | °C · -50…50 | settable |
| Humidity offset | humidity_offset | % · -50…50 | settable |
| Automatic calibrations | automatic_calibrations | — | settable |
| Forced recalibration | forced_recalibration | — | settable |
| Factory reset co2 | factory_reset_co2 | — | settable |
| Manual forced recalibration | manual_forced_recalibration | ppm · 0…5000 | settable |
| Enable co2 gas | enable_co2_gas | — | settable |
| High co2 gas | high_co2_gas | ppm · 400…5000 | settable |
| Low co2 gas | low_co2_gas | ppm · 400…5000 | settable |
| Enable voc | enable_voc | — | settable |
| High voc | high_voc | VOC Index points · 0…500 | settable |
| Low voc | low_voc | VOC Index points · 0…500 | settable |
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,
"temperature": 21.6,
"humidity": 46.2,
"voc_index": 0,
"reading_interval": 158,
"light_indicator": false,
"light_indicator_level": 50,
"set_altitude": 1500,
"temperature_offset": 0,
"humidity_offset": 0,
"automatic_calibrations": false,
"forced_recalibration": false,
"factory_reset_co2": false,
"manual_forced_recalibration": 2500,
"linkquality": 120
}
Send commands to zigbee2mqtt/my_device/set:
mosquitto_pub -t zigbee2mqtt/my_device/set -m '{"light_indicator":true}'
mosquitto_pub -t zigbee2mqtt/my_device/set -m '{"automatic_calibrations":true}'
mosquitto_pub -t zigbee2mqtt/my_device/set -m '{"forced_recalibration":true}'
mosquitto_pub -t zigbee2mqtt/my_device/set -m '{"factory_reset_co2":true}'
mosquitto_pub -t zigbee2mqtt/my_device/set -m '{"enable_co2_gas":true}'
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.