What it exposes
| Feature | Property | Values | Control |
|---|---|---|---|
| CO₂ | co2 | ppm | read only |
| Battery | battery | % · 0…100 | read only |
| Low battery | battery_low | — | read only |
| Uptime | uptime | Hours | read only |
| Report delay | report_delay | sec · 20…1800 | settable |
| Power mode | power_mode | Fast, Medium, Slow | settable |
| Forced recalibration | forced_recalibration | — | settable |
| Manual forced recalibration | manual_forced_recalibration | ppm · 0…5000 | settable |
| Automatic scal | automatic_scal | — | settable |
| Factory reset co2 | factory_reset_co2 | — | 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,
"battery": 87,
"battery_low": false,
"uptime": 0,
"report_delay": 910,
"power_mode": "Fast",
"forced_recalibration": false,
"manual_forced_recalibration": 2500,
"automatic_scal": false,
"factory_reset_co2": false,
"linkquality": 120
}
Send commands to zigbee2mqtt/my_device/set:
mosquitto_pub -t zigbee2mqtt/my_device/set -m '{"power_mode":"Medium"}'
mosquitto_pub -t zigbee2mqtt/my_device/set -m '{"forced_recalibration":true}'
mosquitto_pub -t zigbee2mqtt/my_device/set -m '{"automatic_scal":true}'
mosquitto_pub -t zigbee2mqtt/my_device/set -m '{"factory_reset_co2":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: "Time to ventilate"
mode: single
triggers:
- trigger: numeric_state
entity_id: sensor.my_device_co2
above: 1000
actions:
- action: notify.notify
data:
message: "CO₂ above 1000 ppm, open a window"
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.