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 |
| Backlight | backlight | — | settable |
| Night onoff backlight | night_onoff_backlight | — | settable |
| Night on backlight | night_on_backlight | Hr · 0…23 | settable |
| Night off backlight | night_off_backlight | Hr · 0…23 | settable |
| Contrast | contrast | 0…40 | settable |
| Temperature offset | temperature_offset | °C · -50…50 | settable |
| Humidity offset | humidity_offset | % · -50…50 | settable |
| Automatic calibrations | automatic_calibrations | — | settable |
| Forced recalibration on air | forced_recalibration_on_air | — | settable |
| Co2 error read | co2_error_read | — | read only |
| Enable gas | enable_gas | — | settable |
| Invert logic gas | invert_logic_gas | — | settable |
| High gas | high_gas | ppm · 400…5000 | settable |
| Low gas | low_gas | ppm · 400…5000 | 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,
"backlight": false,
"night_onoff_backlight": false,
"night_on_backlight": 12,
"night_off_backlight": 12,
"contrast": 20,
"temperature_offset": 0,
"humidity_offset": 0,
"automatic_calibrations": false,
"forced_recalibration_on_air": false,
"co2_error_read": 0,
"enable_gas": false,
"linkquality": 120
}
Send commands to zigbee2mqtt/my_device/set:
mosquitto_pub -t zigbee2mqtt/my_device/set -m '{"backlight":true}'
mosquitto_pub -t zigbee2mqtt/my_device/set -m '{"night_onoff_backlight":true}'
mosquitto_pub -t zigbee2mqtt/my_device/set -m '{"automatic_calibrations":true}'
mosquitto_pub -t zigbee2mqtt/my_device/set -m '{"forced_recalibration_on_air":true}'
mosquitto_pub -t zigbee2mqtt/my_device/set -m '{"enable_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.