Add mmol support to nightscout

homeassistant/components/nightscout/config_flow.py

@@ -8,16 +8,21 @@
 import voluptuous as vol
 
 from homeassistant.config_entries import ConfigFlow, ConfigFlowResult
-from homeassistant.const import CONF_API_KEY, CONF_URL
+from homeassistant.const import CONF_API_KEY, CONF_UNIT_OF_MEASUREMENT, CONF_URL
 from homeassistant.exceptions import HomeAssistantError
 
-from .const import DOMAIN
+from .const import DOMAIN, MG_DL, MMOL_L
 from .utils import hash_from_url
 
 _LOGGER = logging.getLogger(__name__)
 
-DATA_SCHEMA = vol.Schema({vol.Required(CONF_URL): str, vol.Optional(CONF_API_KEY): str})
-
+DATA_SCHEMA = vol.Schema(
+    {
+        vol.Required(CONF_URL): str,
+        vol.Optional(CONF_API_KEY): str,
+        vol.Optional(CONF_UNIT_OF_MEASUREMENT, default=MG_DL): vol.In([MG_DL, MMOL_L]),
+    }
+)
 
 async def _validate_input(data: dict[str, Any]) -> dict[str, str]:
     """Validate the user input allows us to connect."""

homeassistant/components/nightscout/const.py

@@ -5,3 +5,5 @@
 ATTR_DEVICE = "device"
 ATTR_DELTA = "delta"
 ATTR_DIRECTION = "direction"
+MMOL_L = "mmol/L"
+MG_DL = "mg/dL"

homeassistant/components/nightscout/sensor.py

@@ -11,11 +11,11 @@
 
 from homeassistant.components.sensor import SensorEntity
 from homeassistant.config_entries import ConfigEntry
-from homeassistant.const import ATTR_DATE
+from homeassistant.const import ATTR_DATE, CONF_UNIT_OF_MEASUREMENT
 from homeassistant.core import HomeAssistant
 from homeassistant.helpers.entity_platform import AddEntitiesCallback
 
-from .const import ATTR_DELTA, ATTR_DEVICE, ATTR_DIRECTION, DOMAIN
+from .const import ATTR_DELTA, ATTR_DEVICE, ATTR_DIRECTION, DOMAIN, MMOL_L, MG_DL
 
 SCAN_INTERVAL = timedelta(minutes=1)
 
@@ -31,18 +31,23 @@ async def async_setup_entry(
 ) -> None:
     """Set up the Glucose Sensor."""
     api = hass.data[DOMAIN][entry.entry_id]
-    async_add_entities([NightscoutSensor(api, "Blood Sugar", entry.unique_id)], True)
+    unit = entry.data.get(CONF_UNIT_OF_MEASUREMENT, MG_DL)
+    async_add_entities(
+        [NightscoutSensor(api, "Blood Sugar", entry.unique_id, unit)], True
+    )
 
 
 class NightscoutSensor(SensorEntity):
     """Implementation of a Nightscout sensor."""
 
-    _attr_native_unit_of_measurement = "mg/dL"
     _attr_icon = "mdi:cloud-question"
 
-    def __init__(self, api: NightscoutAPI, name: str, unique_id: str | None) -> None:
+    def __init__(
+        self, api: NightscoutAPI, name: str, unique_id: str | None, unit: str
+    ) -> None:
         """Initialize the Nightscout sensor."""
         self.api = api
+        self._attr_native_unit_of_measurement = unit
         self._attr_unique_id = unique_id
         self._attr_name = name
         self._attr_extra_state_attributes: dict[str, Any] = {}
@@ -67,7 +72,10 @@ async def async_update(self) -> None:
                 ATTR_DELTA: value.delta,
                 ATTR_DIRECTION: value.direction,
             }
-            self._attr_native_value = value.sgv
+            if self._attr_native_unit_of_measurement == MMOL_L:
+                self._attr_native_value = round(value.sgv * 0.0555, 1)
+            else:
+                self._attr_native_value = value.sgv
             self._attr_icon = self._parse_icon(value.direction)
         else:
             self._attr_available = False

homeassistant/components/nightscout/strings.json

@@ -3,10 +3,11 @@
     "step": {
       "user": {
         "title": "Enter your Nightscout server information.",
-        "description": "- URL: the address of your nightscout instance. I.e.: https://myhomeassistant.duckdns.org:5423\n- API Key (optional): Only use if your instance is protected (auth_default_roles != readable).",
+        "description": "- URL: the address of your nightscout instance. I.e.: https://myhomeassistant.duckdns.org:5423\n- API Key (optional): Only use if your instance is protected (auth_default_roles != readable).\n- Units: Select the unit type to display.",
         "data": {
           "url": "[%key:common::config_flow::data::url%]",
-          "api_key": "[%key:common::config_flow::data::api_key%]"
+          "api_key": "[%key:common::config_flow::data::api_key%]",
+          "unit_of_measurement": "[%key:common::config_flow::data::unit_of_measurement%]"
         }
       }
     },