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Zigbee devices Smoke and gas detectors

Develco ZHEMI101

Energy/gas/water meter interface. Works with Zigbee2MQTT with no vendor hub or cloud: it pairs with a Zigbee stick and shows up in Home Assistant.

Vendor
Develco
Model
ZHEMI101
Type
Smoke and gas detectors
Power
battery: an end device, does not extend the mesh
Firmware updates (OTA)
no

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What it exposes

FeaturePropertyValuesControl
EnergyenergykWhread only
Produced energyproduced_energykWhread only
PowerpowerWread only
Gasgasm³read only
Water consumedwater_consumedm³read only
Flowflowm³/hread only
Low batterybattery_low—read only
Unit of measureunit_of_measure—read only
Metering device typemetering_device_type—read only
Summation formattingsummation_formatting—read only
Demand formattingdemand_formatting—read only
Multipliermultiplier—read only
Divisordivisor—read only
Pulse configurationpulse_configuration0…65535settable
Interface modeinterface_modeelectricity, gas, water, kamstrup-kmp, linky, IEC62056-21, DSMR-2.3, DSMR-4.0settable
Unit summationunit_summation0…9007199254740991settable
Check metercheck_meter—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:

{
  "energy": 3.21,
  "produced_energy": 0,
  "power": 12.4,
  "gas": 0,
  "water_consumed": 0,
  "flow": 0,
  "battery_low": false,
  "unit_of_measure": 0,
  "metering_device_type": 0,
  "summation_formatting": 0,
  "demand_formatting": 0,
  "multiplier": 0,
  "divisor": 0,
  "pulse_configuration": 32768,
  "linkquality": 120
}

Send commands to zigbee2mqtt/my_device/set:

mosquitto_pub -t zigbee2mqtt/my_device/set -m '{"interface_mode":"gas"}'

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: "Smoke alarm"
  mode: single
  triggers:
    - trigger: state
      entity_id: binary_sensor.my_device_smoke
      to: "on"
  actions:
    - action: notify.notify
      data:
        message: "Smoke detected!"

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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