Implement Sensor for KNX Platform (#2911)

* Added Sensor Support for KNX Devices

Added Sensor for KNX Group Addresses
- Temperature
- Wind Speed
- Illuminance(LUX)

Mostly to fetch from a KNX Wetterstation

* Some pylint,flake8 fixes

* Pydoc Fixes

* Fix Coverage Ordering

* Refactor KNX Sensor

Refactor to Idea from @usul27 and added Minimum Maximum

* Removed Measurement Untis from const.py

Removed needed Measurement Units from const.py and add it to
sensor\knx.py

* Change .coveragerc

* Add as Requested from @Teagan42 the new Type Names

Additional add CONF_MINIMUM and CONF_MAXIMUM

* Added Changes as Requested from @Teagan42

* Fixed the Merge Conflict, Hopefully i done it rigth :-)

* Fixed Styling

.coveragerc

@@ -93,9 +93,7 @@ omit =
     homeassistant/components/*/pilight.py
 
     homeassistant/components/knx.py
-    homeassistant/components/switch/knx.py
-    homeassistant/components/binary_sensor/knx.py
-    homeassistant/components/thermostat/knx.py
+    homeassistant/components/*/knx.py
 
     homeassistant/components/alarm_control_panel/alarmdotcom.py
     homeassistant/components/alarm_control_panel/nx584.py

homeassistant/components/sensor/knx.py

@@ -0,0 +1,128 @@
+"""
+Sensors of a KNX Device.
+
+For more details about this platform, please refer to the documentation at
+https://home-assistant.io/components/knx/
+"""
+from homeassistant.const import (TEMP_CELSIUS, TEMPERATURE, CONF_TYPE,
+                                 ILLUMINANCE, SPEED_MS, CONF_MINIMUM,
+                                 CONF_MAXIMUM)
+from homeassistant.components.knx import (KNXConfig, KNXGroupAddress)
+
+
+DEPENDENCIES = ["knx"]
+
+# Speed units
+SPEED_METERPERSECOND = "m/s"  # type: str
+
+# Illuminance units
+ILLUMINANCE_LUX = "lx"  # type: str
+
+#  Predefined Minimum, Maximum Values for Sensors
+#  Temperature as defined in KNX Standard 3.10 - 9.001 DPT_Value_Temp
+KNX_TEMP_MIN = -273
+KNX_TEMP_MAX = 670760
+
+#  Luminance(LUX) as Defined in KNX Standard 3.10 - 9.004 DPT_Value_Lux
+KNX_LUX_MIN = 0
+KNX_LUX_MAX = 670760
+
+#  Speed m/s as defined in KNX Standard 3.10 - 9.005 DPT_Value_Wsp
+KNX_SPEED_MS_MIN = 0
+KNX_SPEED_MS_MAX = 670760
+
+
+def setup_platform(hass, config, add_entities, discovery_info=None):
+    """Setup the KNX Sensor platform."""
+    # Add KNX Temperature Sensors
+    # KNX Datapoint 9.001 DPT_Value_Temp
+    if config[CONF_TYPE] == TEMPERATURE:
+        minimum_value, maximum_value = \
+            update_and_define_min_max(config, KNX_TEMP_MIN,
+                                      KNX_TEMP_MAX)
+
+        add_entities([
+            KNXSensorFloatClass(hass, KNXConfig(config), TEMP_CELSIUS,
+                                minimum_value, maximum_value)
+        ])
+
+    # Add KNX Speed Sensors(Like Wind Speed)
+    # KNX Datapoint 9.005 DPT_Value_Wsp
+    elif config[CONF_TYPE] == SPEED_MS:
+        minimum_value, maximum_value = \
+            update_and_define_min_max(config, KNX_SPEED_MS_MIN,
+                                      KNX_SPEED_MS_MAX)
+
+        add_entities([
+            KNXSensorFloatClass(hass, KNXConfig(config), SPEED_METERPERSECOND,
+                                minimum_value, maximum_value)
+        ])
+
+    # Add KNX Illuminance Sensors(Lux)
+    # KNX Datapoint 9.004 DPT_Value_Lux
+    elif config[CONF_TYPE] == ILLUMINANCE:
+        minimum_value, maximum_value = \
+            update_and_define_min_max(config, KNX_LUX_MIN, KNX_LUX_MAX)
+
+        add_entities([
+            KNXSensorFloatClass(hass, KNXConfig(config), ILLUMINANCE_LUX,
+                                minimum_value, maximum_value)
+        ])
+
+
+def update_and_define_min_max(config, minimum_default,
+                              maximum_default):
+    """Function help determinate a min/max value defined in config."""
+    minimum_value = minimum_default
+    maximum_value = maximum_default
+    if config.get(CONF_MINIMUM):
+        minimum_value = config.get(CONF_MINIMUM)
+
+    if config.get(CONF_MAXIMUM):
+        maximum_value = config.get(CONF_MAXIMUM)
+
+    return minimum_value, maximum_value
+
+
+class KNXSensorBaseClass():  # pylint: disable=too-few-public-methods
+    """Sensor Base Class for all KNX Sensors."""
+
+    _unit_of_measurement = None
+
+    @property
+    def cache(self):
+        """We don't want to cache any Sensor Value."""
+        return False
+
+    @property
+    def unit_of_measurement(self):
+        """Return the defined Unit of Measurement for the KNX Sensor."""
+        return self._unit_of_measurement
+
+
+class KNXSensorFloatClass(KNXGroupAddress, KNXSensorBaseClass):
+    """
+    Base Implementation of a 2byte Floating Point KNX Telegram.
+
+    Defined in KNX 3.7.2 - 3.10
+    """
+
+    # pylint: disable=too-many-arguments
+    def __init__(self, hass, config, unit_of_measurement, minimum_sensor_value,
+                 maximum_sensor_value):
+        """Initialize a KNX Float Sensor."""
+        self._unit_of_measurement = unit_of_measurement
+        self._minimum_value = minimum_sensor_value
+        self._maximum_value = maximum_sensor_value
+
+        KNXGroupAddress.__init__(self, hass, config)
+
+    @property
+    def state(self):
+        """Return the Value of the KNX Sensor."""
+        if self._data:
+            from knxip.conversion import knx2_to_float
+            value = knx2_to_float(self._data)
+            if self._minimum_value <= value <= self._maximum_value:
+                return value
+        return None

homeassistant/const.py

@@ -94,6 +94,8 @@ CONF_LATITUDE = 'latitude'
 CONF_LONGITUDE = 'longitude'
 CONF_MAC = 'mac'
 CONF_METHOD = 'method'
+CONF_MINIMUM = 'minimum'
+CONF_MAXIMUM = 'maximum'
 CONF_MONITORED_CONDITIONS = 'monitored_conditions'
 CONF_MONITORED_VARIABLES = 'monitored_variables'
 CONF_NAME = 'name'
@@ -125,6 +127,7 @@ CONF_TIME_ZONE = 'time_zone'
 CONF_TIMEOUT = 'timeout'
 CONF_TOKEN = 'token'
 CONF_TRIGGER_TIME = 'trigger_time'
+CONF_TYPE = 'type'
 CONF_UNIT_OF_MEASUREMENT = 'unit_of_measurement'
 CONF_UNIT_SYSTEM = 'unit_system'
 CONF_URL = 'url'
@@ -374,3 +377,5 @@ LENGTH = 'length'  # type: str
 MASS = 'mass'  # type: str
 VOLUME = 'volume'  # type: str
 TEMPERATURE = 'temperature'  # type: str
+SPEED_MS = 'speed_ms'  # type: str
+ILLUMINANCE = 'illuminance'  # type: str