zha: Add support for humidity sensors (#12496)

* zha: Add support for humidity sensors

* Fix lint issue

homeassistant/components/sensor/zha.py

@@ -31,19 +31,22 @@ def async_setup_platform(hass, config, async_add_devices, discovery_info=None):
 @asyncio.coroutine
 def make_sensor(discovery_info):
     """Create ZHA sensors factory."""
-    from zigpy.zcl.clusters.measurement import TemperatureMeasurement
+    from zigpy.zcl.clusters.measurement import (
+        RelativeHumidity, TemperatureMeasurement
+    )
     in_clusters = discovery_info['in_clusters']
-    if TemperatureMeasurement.cluster_id in in_clusters:
+    if RelativeHumidity.cluster_id in in_clusters:
+        sensor = RelativeHumiditySensor(**discovery_info)
+    elif TemperatureMeasurement.cluster_id in in_clusters:
         sensor = TemperatureSensor(**discovery_info)
     else:
         sensor = Sensor(**discovery_info)
 
-    attr = sensor.value_attribute
     if discovery_info['new_join']:
         cluster = list(in_clusters.values())[0]
         yield from cluster.bind()
         yield from cluster.configure_reporting(
-            attr, 300, 600, sensor.min_reportable_change,
+            sensor.value_attribute, 300, 600, sensor.min_reportable_change,
         )
 
     return sensor
@@ -89,3 +92,22 @@ class TemperatureSensor(Sensor):
         celsius = round(float(self._state) / 100, 1)
         return convert_temperature(
             celsius, TEMP_CELSIUS, self.unit_of_measurement)
+
+
+class RelativeHumiditySensor(Sensor):
+    """ZHA relative humidity sensor."""
+
+    min_reportable_change = 50  # 0.5%
+
+    @property
+    def unit_of_measurement(self):
+        """Return the unit of measurement of this entity."""
+        return '%'
+
+    @property
+    def state(self):
+        """Return the state of the entity."""
+        if self._state == 'unknown':
+            return 'unknown'
+
+        return round(float(self._state) / 100, 1)

homeassistant/components/zha/const.py

@@ -33,6 +33,7 @@ def populate_data():
 
     SINGLE_CLUSTER_DEVICE_CLASS.update({
         zcl.clusters.general.OnOff: 'switch',
+        zcl.clusters.measurement.RelativeHumidity: 'sensor',
         zcl.clusters.measurement.TemperatureMeasurement: 'sensor',
         zcl.clusters.security.IasZone: 'binary_sensor',
     })