Merge pull request #24 from schizza/chill_index

Wind chill index

custom_components/sws12500/const.py

@@ -70,6 +70,7 @@ UV: Final = "uv"
 CH2_TEMP: Final = "ch2_temp"
 CH2_HUMIDITY: Final = "ch2_humidity"
 HEAT_INDEX: Final = "heat_index"
+CHILL_INDEX: Final = "chill_index"
 
 
 REMAP_ITEMS: dict = {

custom_components/sws12500/sensor.py

@@ -1,4 +1,5 @@
 """Sensors definition for SWS12500."""
+
 from collections.abc import Callable
 from dataclasses import dataclass
 import logging
@@ -34,6 +35,7 @@ from .const import (
     BARO_PRESSURE,
     CH2_HUMIDITY,
     CH2_TEMP,
+    CHILL_INDEX,
     DAILY_RAIN,
     DEW_POINT,
     DOMAIN,
@@ -52,7 +54,7 @@ from .const import (
     WIND_SPEED,
     UnitOfDir,
 )
-from .utils import wind_dir_to_text, heat_index
+from .utils import heat_index, wind_dir_to_text, chill_index
 
 _LOGGER = logging.getLogger(__name__)
 
@@ -226,6 +228,17 @@ SENSOR_TYPES: tuple[WeatherSensorEntityDescription, ...] = (
         translation_key=HEAT_INDEX,
         value_fn=lambda data: cast(int, data),
     ),
+    WeatherSensorEntityDescription(
+        key=CHILL_INDEX,
+        native_unit_of_measurement=UnitOfTemperature.FAHRENHEIT,
+        state_class=SensorStateClass.MEASUREMENT,
+        device_class=SensorDeviceClass.TEMPERATURE,
+        suggested_unit_of_measurement=UnitOfTemperature.CELSIUS,
+        suggested_display_precision=2,
+        icon="mdi:weather-sunny",
+        translation_key=CHILL_INDEX,
+        value_fn=lambda data: cast(int, data),
+    ),
 )
 
 
@@ -245,8 +258,11 @@ async def async_setup_entry(
     if sensors_to_load := config_entry.options.get(SENSORS_TO_LOAD):
         if WIND_DIR in sensors_to_load:
             sensors_to_load.append(WIND_AZIMUT)
-        if (WIND_SPEED in sensors_to_load) and (OUTSIDE_TEMP in sensors_to_load):
+        if (OUTSIDE_HUMIDITY in sensors_to_load) and (OUTSIDE_TEMP in sensors_to_load):
             sensors_to_load.append(HEAT_INDEX)
+
+        if (WIND_SPEED in sensors_to_load) and (OUTSIDE_TEMP in sensors_to_load):
+            sensors_to_load.append(CHILL_INDEX)
         sensors = [
             WeatherSensor(hass, description, coordinator)
             for description in SENSOR_TYPES
@@ -309,6 +325,9 @@ class WeatherSensor(
         if self.coordinator.data and (HEAT_INDEX in self.entity_description.key):
             return self.entity_description.value_fn(heat_index(self.coordinator.data))
 
+        if self.coordinator.data and (CHILL_INDEX in self.entity_description.key):
+            return self.entity_description.value_fn(chill_index(self.coordinator.data))
+
         return self.entity_description.value_fn(self._data)
 
     @property

custom_components/sws12500/translations/cs.json

@@ -77,6 +77,7 @@
       "ch2_temp": { "name": "Teplota senzoru 2" },
       "ch2_humidity": { "name": "Vlhkost sensoru 2" },
       "heat_index": { "name": "Tepelný index" },
+      "chill_index": { "name": "Pocitová teplota" },
       "wind_azimut": {
         "name": "Azimut",
         "state": {

custom_components/sws12500/translations/en.json

@@ -78,6 +78,7 @@
       "ch2_temp": { "name": "Channel 2 temperature" },
       "ch2_humidity": { "name": "Channel 2 humidity" },
       "heat_index": { "name": "Apparent temperature" },
+      "chill_index": { "name": "Wind chill" },
       "wind_azimut": {
         "name": "Bearing",
         "state": {

custom_components/sws12500/utils.py

@@ -19,6 +19,7 @@ from .const import (
     UnitOfDir,
     OUTSIDE_TEMP,
     OUTSIDE_HUMIDITY,
+    WIND_SPEED,
 )
 
 _LOGGER = logging.getLogger(__name__)
@@ -190,6 +191,22 @@ def heat_index(data: Any) -> UnitOfTemperature:
         if rh > 80 and (temp in np.arange(80, 87, 0.1)):
             adjustment = ((rh - 85) / 10) * ((87 - temp) / 5)
 
-        return full_index + adjustment if adjustment else full_index
+        return round((full_index + adjustment if adjustment else full_index), 2)
 
     return simple
+
+
+def chill_index(data: Any) -> UnitOfTemperature:
+    """Calculate wind chill index."""
+
+    temp = float(data[OUTSIDE_TEMP])
+    wind = float(data[WIND_SPEED])
+
+    return round(
+        (
+            (35.7 + (0.6215 * temp))
+            - (35.75 * (wind**0.16))
+            + (0.4275 * (temp * (wind**0.16)))
+        ),
+        2,
+    )