Temperature, Humidity & Pressure Sensor

Many Zigbee-based sensors (like Xiaomi Aqara WSDCGQ11LM, Sonoff SNZB-02, etc.) report temperature, humidity, pressure, and battery level as separate entities in Home Assistant. This can result in multiple individual devices appearing in your Matter controller instead of one unified device.

With Auto Sensor Grouping and Entity Mapping, you can combine these into a single Matter device that shows temperature, humidity, pressure, and battery status together.

Features

• Combined Device - Single device in Apple Home, Google Home, Alexa instead of 3-4 separate ones
• Temperature - Primary measurement from your temperature sensor
• Humidity - Linked from a separate humidity sensor entity
• Pressure - Linked from a separate pressure sensor entity
• Battery Level - Optional battery status from a separate battery sensor entity
• Auto Grouping - HAMH automatically combines sensors from the same HA device (no manual config needed)
• Device Name - Uses your Home Assistant entity name (e.g., "H&T Bad")

How It Works

Automatic Grouping (Recommended)

Since v2.0.17, HAMH automatically detects related sensors on the same HA device and combines them. This is controlled by three feature flags in Bridge Settings:

Feature Flag	Default	Description
autoHumidityMapping	Enabled	Combines humidity with temperature
autoPressureMapping	Enabled	Combines pressure with temperature
autoBatteryMapping	Enabled	Adds battery to any primary sensor

With auto grouping, you don't need to configure anything manually. The sensors are combined automatically based on their HA device assignment.

Manual Mapping

You can also manually configure which sensors to combine using Entity Mapping.

Instead of exposing each sensor entity separately:

Without Mapping	With Mapping
H&T Bad Temperature	H&T Bad (combined)
H&T Bad Humidity	— (still gets its own standalone endpoint)
H&T Bad Pressure	— (auto-assigned to temperature)
H&T Bad Battery	— (auto-assigned to temperature)

The combined device reports all values in one place.

Note: Humidity entities still create their own standalone endpoint even when auto-assigned to a temperature sensor, because Apple Home only displays humidity on dedicated HumiditySensor endpoints.

Configuration

Step 1: Identify Your Entities

In Home Assistant, find your related sensor entities. For example, a typical Zigbee H&T sensor creates:

• sensor.h_t_bad_temperature - Temperature measurement
• sensor.h_t_bad_humidity - Humidity measurement
• sensor.h_t_bad_pressure - Pressure measurement
• sensor.h_t_bad_battery - Battery percentage

Step 2: Configure Entity Mapping

1. Go to your Bridge in the Dashboard
2. Find your temperature sensor entity (e.g., sensor.h_t_bad_temperature)
3. Click Edit Mapping
4. Fill in the optional fields:
   • Humidity Sensor: sensor.h_t_bad_humidity
   • Pressure Sensor: sensor.h_t_bad_pressure
   • Battery Sensor: sensor.h_t_bad_battery
5. Click Save

Tip: If auto grouping is enabled (default), you typically don't need to do this manually. Only use manual mapping if your sensors are on different HA devices or if auto grouping doesn't detect them correctly.

Step 3: Exclude the Individual Entities

To prevent duplicate devices in your Matter controller:

1. Find the humidity entity (sensor.h_t_bad_humidity)
2. Click Edit Mapping → Enable "Disable this entity"
3. Repeat for the battery entity (sensor.h_t_bad_battery)

Or simply don't include them in your bridge's entity filter.

Step 4: Re-pair (if necessary)

If your devices were already paired, you may need to remove and re-add them in your Matter controller because the device capabilities have changed.

Example Configuration

For a sensor named "H&T Bad" with these entities:

Entity	Mapping
sensor.h_t_bad_temperature	Primary - Set humidityEntity, pressureEntity, and batteryEntity
sensor.h_t_bad_humidity	Keeps its own endpoint (Apple Home needs standalone HumiditySensor)
sensor.h_t_bad_pressure	Auto-assigned or Disabled / excluded from bridge
sensor.h_t_bad_battery	Auto-assigned or Disabled / excluded from bridge

Result: One combined device "H&T Bad" showing temperature, humidity, pressure, and battery.

Compatibility

Controller	Temperature	Humidity	Pressure	Battery
Apple Home	✅	✅	✅	✅
Google Home	✅	✅	✅	✅
Amazon Alexa	✅	✅	✅	⚠️ Limited

Technical Details

The combined sensor uses these Matter clusters:

• TemperatureMeasurement - From the primary temperature entity
• RelativeHumidityMeasurement - From the linked humidity entity
• PressureMeasurement - From the linked pressure entity (in dPa)
• PowerSource - Battery level from the linked battery entity

Pressure values are converted to deciPascals (dPa) for Matter. Supported HA units: hPa, mbar, kPa, Pa.

Troubleshooting

Humidity/Battery not showing

1. Verify the entity IDs are correct (check spelling, case sensitivity)
2. Confirm the linked sensors provide numeric values
3. Remove and re-add the device in your Matter controller

Device shows incorrect name

The Matter device name comes from your primary temperature entity's friendly_name in Home Assistant. Customize it there or use the Custom Name field in Entity Mapping.

Old individual devices still appear

After configuring the combined sensor:

1. Disable or exclude the individual humidity/battery entities
2. Remove old devices from your Matter controller
3. Re-pair the bridge if necessary

Example Home Assistant Entities

Typical Zigbee H&T sensor entities:

# Temperature sensor
sensor.h_t_bad_temperature:
  state: "21.5"
  attributes:
    device_class: temperature
    unit_of_measurement: "°C"
    friendly_name: "H&T Bad"

# Humidity sensor  
sensor.h_t_bad_humidity:
  state: "58"
  attributes:
    device_class: humidity
    unit_of_measurement: "%"
    friendly_name: "H&T Bad Humidity"

# Pressure sensor
sensor.h_t_bad_pressure:
  state: "1013.25"
  attributes:
    device_class: atmospheric_pressure
    unit_of_measurement: "hPa"
    friendly_name: "H&T Bad Pressure"

# Battery sensor
sensor.h_t_bad_battery:
  state: "87"
  attributes:
    device_class: battery
    unit_of_measurement: "%"
    friendly_name: "H&T Bad Battery"