diff --git a/custom_components/hochwasserportal/__init__.py b/custom_components/hochwasserportal/__init__.py
new file mode 100644
index 0000000..6c20ce9
--- /dev/null
+++ b/custom_components/hochwasserportal/__init__.py
@@ -0,0 +1,76 @@
+"""The Länderübergreifendes Hochwasser Portal integration."""
+
+from __future__ import annotations
+
+from lhpapi import HochwasserPortalAPI, LHPError
+
+from homeassistant.config_entries import ConfigEntry
+from homeassistant.core import HomeAssistant
+
+from .const import (
+    CONF_ADD_UNAVAILABLE,
+    CONF_PEGEL_IDENTIFIER,
+    DOMAIN,
+    LOGGER,
+    PLATFORMS,
+)
+from .coordinator import HochwasserPortalCoordinator
+
+
+async def async_setup_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
+    """Set up a config entry."""
+    pegel_identifier: str = entry.data[CONF_PEGEL_IDENTIFIER]
+
+    # Initialize the API and coordinator.
+    try:
+        api = await hass.async_add_executor_job(HochwasserPortalAPI, pegel_identifier)
+        coordinator = HochwasserPortalCoordinator(hass, api)
+    except LHPError as err:
+        LOGGER.exception("Setup of %s failed: %s", pegel_identifier, err)
+        return False
+
+    # No need to refresh via the following line because api runs
+    # update during init automatically
+    # await coordinator.async_config_entry_first_refresh()
+
+    hass.data.setdefault(DOMAIN, {})[entry.entry_id] = coordinator
+    await hass.config_entries.async_forward_entry_setups(entry, PLATFORMS)
+    return True
+
+
+async def async_migrate_entry(hass: HomeAssistant, config_entry: ConfigEntry) -> bool:
+    """Migrate old entry."""
+    LOGGER.debug(
+        "Migrating %s from version %s.%s",
+        config_entry.title,
+        config_entry.version,
+        config_entry.minor_version,
+    )
+
+    if config_entry.version > 1:
+        # This means the user has downgraded from a future version
+        return False
+
+    if config_entry.version == 1:
+        new = {**config_entry.data}
+        if config_entry.minor_version < 2:
+            new[CONF_ADD_UNAVAILABLE] = True  # Behaviour as in 1.1
+            config_entry.minor_version = 2
+            hass.config_entries.async_update_entry(config_entry, data=new)
+
+    LOGGER.debug(
+        "Migration of %s to version %s.%s successful",
+        config_entry.title,
+        config_entry.version,
+        config_entry.minor_version,
+    )
+
+    return True
+
+
+async def async_unload_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
+    """Unload a config entry."""
+    if unload_ok := await hass.config_entries.async_unload_platforms(entry, PLATFORMS):
+        hass.data[DOMAIN].pop(entry.entry_id)
+
+    return unload_ok
diff --git a/custom_components/hochwasserportal/config_flow.py b/custom_components/hochwasserportal/config_flow.py
new file mode 100644
index 0000000..94aef41
--- /dev/null
+++ b/custom_components/hochwasserportal/config_flow.py
@@ -0,0 +1,62 @@
+"""Config flow for the hochwasserportal integration."""
+
+from __future__ import annotations
+
+from typing import Any
+
+from lhpapi import HochwasserPortalAPI, LHPError
+import voluptuous as vol
+
+from homeassistant.config_entries import ConfigFlow
+from homeassistant.data_entry_flow import FlowResult
+import homeassistant.helpers.config_validation as cv
+
+from .const import CONF_ADD_UNAVAILABLE, CONF_PEGEL_IDENTIFIER, DOMAIN, LOGGER
+
+
+class HochwasserPortalConfigFlow(ConfigFlow, domain=DOMAIN):
+    """Handle the config flow for the hochwasserportal integration."""
+
+    VERSION = 1
+    MINOR_VERSION = 2
+
+    async def async_step_user(
+        self, user_input: dict[str, Any] | None = None
+    ) -> FlowResult:
+        """Handle the initial step."""
+        errors: dict = {}
+
+        if user_input is not None:
+            pegel_identifier = user_input[CONF_PEGEL_IDENTIFIER]
+
+            # Validate pegel identifier using the API
+            try:
+                api = await self.hass.async_add_executor_job(
+                    HochwasserPortalAPI, pegel_identifier
+                )
+                LOGGER.debug(
+                    "%s (%s): Successfully added!",
+                    api.ident,
+                    api.name,
+                )
+            except LHPError as err:
+                LOGGER.exception("Setup of %s failed: %s", pegel_identifier, err)
+                errors["base"] = "invalid_identifier"
+
+            if not errors:
+                # Set the unique ID for this config entry.
+                await self.async_set_unique_id(f"{DOMAIN}_{pegel_identifier.lower()}")
+                self._abort_if_unique_id_configured()
+
+                return self.async_create_entry(title=f"{api.name}", data=user_input)
+
+        return self.async_show_form(
+            step_id="user",
+            errors=errors,
+            data_schema=vol.Schema(
+                {
+                    vol.Required(CONF_PEGEL_IDENTIFIER): cv.string,
+                    vol.Required(CONF_ADD_UNAVAILABLE, default=False): cv.boolean,
+                }
+            ),
+        )
diff --git a/custom_components/hochwasserportal/const.py b/custom_components/hochwasserportal/const.py
new file mode 100644
index 0000000..7127a3b
--- /dev/null
+++ b/custom_components/hochwasserportal/const.py
@@ -0,0 +1,46 @@
+"""Constants for the Länderübergreifendes Hochwasser Portal integration."""
+
+from __future__ import annotations
+
+from datetime import timedelta
+import logging
+from typing import Final
+
+from homeassistant.const import Platform
+
+LOGGER = logging.getLogger(__package__)
+
+DOMAIN: Final = "hochwasserportal"
+
+CONF_PEGEL_IDENTIFIER: Final = "pegel_identifier"
+CONF_ADD_UNAVAILABLE: Final = "add_unavailable"
+
+ATTR_DATA_PROVIDERS: Final[dict[str, str]] = {
+    "BB": "LfU Brandenburg",
+    "BE": "SenMVKU Berlin",
+    "BW": "LUBW Baden-Württemberg",
+    "BY": "LfU Bayern",
+    "HB": "SUKW Bremen",
+    "HE": "HLNUG",
+    "HH": "LSBG Hamburg",
+    "MV": "LUNG Mecklenburg-Vorpommern",
+    "NI": "NLWKN",
+    "NW": "LANUV Nordrhein-Westfalen",
+    "RP": "Luf Rheinland-Pfalz",
+    "SH": "Luf Schleswig-Holstein",
+    "SL": "LUA Saarland",
+    "SN": "LfULG Sachsen",
+    "ST": "Land Sachsen-Anhalt",
+    "TH": "TLUBN",
+}
+ATTR_LAST_UPDATE: Final = "last_update"
+ATTR_URL: Final = "url"
+ATTR_HINT: Final = "hint"
+
+LEVEL_SENSOR: Final = "level"
+STAGE_SENSOR: Final = "stage"
+FLOW_SENSOR: Final = "flow"
+
+DEFAULT_SCAN_INTERVAL: Final = timedelta(minutes=15)
+
+PLATFORMS: Final[list[Platform]] = [Platform.SENSOR]
diff --git a/custom_components/hochwasserportal/coordinator.py b/custom_components/hochwasserportal/coordinator.py
new file mode 100644
index 0000000..faa6ef6
--- /dev/null
+++ b/custom_components/hochwasserportal/coordinator.py
@@ -0,0 +1,32 @@
+"""Data coordinator for the hochwasserportal integration."""
+
+from __future__ import annotations
+
+from lhpapi import HochwasserPortalAPI, LHPError
+
+from homeassistant.core import HomeAssistant
+from homeassistant.helpers.update_coordinator import DataUpdateCoordinator
+
+from .const import DEFAULT_SCAN_INTERVAL, DOMAIN, LOGGER
+
+
+class HochwasserPortalCoordinator(DataUpdateCoordinator[None]):
+    """Custom coordinator for the hochwasserportal integration."""
+
+    def __init__(self, hass: HomeAssistant, api: HochwasserPortalAPI) -> None:
+        """Initialize the hochwasserportal coordinator."""
+        super().__init__(
+            hass, LOGGER, name=DOMAIN, update_interval=DEFAULT_SCAN_INTERVAL
+        )
+
+        self.api = api
+        LOGGER.debug("%s", repr(self.api))
+
+    async def _async_update_data(self) -> None:
+        """Get the latest data from the hochwasserportal API."""
+        try:
+            await self.hass.async_add_executor_job(self.api.update)
+            LOGGER.debug("%s", repr(self.api))
+        except LHPError as err:
+            LOGGER.exception("Update of %s failed: %s", self.api.ident, err)
+            return False
diff --git a/custom_components/hochwasserportal/manifest.json b/custom_components/hochwasserportal/manifest.json
new file mode 100644
index 0000000..d888608
--- /dev/null
+++ b/custom_components/hochwasserportal/manifest.json
@@ -0,0 +1,14 @@
+{
+  "domain": "hochwasserportal",
+  "name": "Länderübergreifendes Hochwasser Portal",
+  "codeowners": ["@stephan192"],
+  "config_flow": true,
+  "dependencies": [],
+  "documentation": "https://github.com/stephan192/hochwasserportal",
+  "integration_type": "device",
+  "iot_class": "cloud_polling",
+  "issue_tracker": "https://github.com/stephan192/hochwasserportal/issues",
+  "loggers": ["hochwasserportal"],
+  "requirements": ["lhpapi==1.0.3"],
+  "version": "1.0.1"
+}
\ No newline at end of file
diff --git a/custom_components/hochwasserportal/sensor.py b/custom_components/hochwasserportal/sensor.py
new file mode 100644
index 0000000..09b2ecd
--- /dev/null
+++ b/custom_components/hochwasserportal/sensor.py
@@ -0,0 +1,148 @@
+"""Platform for sensor integration."""
+
+from __future__ import annotations
+
+from collections.abc import Callable
+from dataclasses import dataclass
+
+from lhpapi import HochwasserPortalAPI
+
+from homeassistant.components.sensor import (
+    SensorEntity,
+    SensorEntityDescription,
+    SensorStateClass,
+)
+from homeassistant.config_entries import ConfigEntry
+from homeassistant.const import UnitOfLength
+from homeassistant.core import HomeAssistant
+from homeassistant.helpers.entity import DeviceInfo
+from homeassistant.helpers.entity_platform import AddEntitiesCallback
+from homeassistant.helpers.update_coordinator import CoordinatorEntity
+
+from .const import (
+    ATTR_DATA_PROVIDERS,
+    ATTR_HINT,
+    ATTR_LAST_UPDATE,
+    ATTR_URL,
+    CONF_ADD_UNAVAILABLE,
+    DOMAIN,
+    FLOW_SENSOR,
+    LEVEL_SENSOR,
+    LOGGER,
+    STAGE_SENSOR,
+)
+from .coordinator import HochwasserPortalCoordinator
+
+
+@dataclass(frozen=True, kw_only=True)
+class HochwasserPortalSensorEntityDescription(SensorEntityDescription):
+    """Describes HochwasserPortal sensor entity."""
+
+    value_fn: Callable[[HochwasserPortalAPI], int | float | None]
+    available_fn: Callable[[HochwasserPortalAPI], bool]
+
+
+SENSOR_TYPES: tuple[HochwasserPortalSensorEntityDescription, ...] = (
+    HochwasserPortalSensorEntityDescription(
+        key=LEVEL_SENSOR,
+        translation_key=LEVEL_SENSOR,
+        icon="mdi:waves",
+        native_unit_of_measurement=UnitOfLength.CENTIMETERS,
+        device_class=None,
+        state_class=SensorStateClass.MEASUREMENT,
+        value_fn=lambda api: api.level,
+        available_fn=lambda api: api.level is not None,
+    ),
+    HochwasserPortalSensorEntityDescription(
+        key=STAGE_SENSOR,
+        translation_key=STAGE_SENSOR,
+        icon="mdi:waves-arrow-up",
+        native_unit_of_measurement=None,
+        device_class=None,
+        state_class=SensorStateClass.MEASUREMENT,
+        value_fn=lambda api: api.stage,
+        available_fn=lambda api: api.stage is not None,
+    ),
+    HochwasserPortalSensorEntityDescription(
+        key=FLOW_SENSOR,
+        translation_key=FLOW_SENSOR,
+        icon="mdi:waves-arrow-right",
+        native_unit_of_measurement="m³/s",
+        device_class=None,
+        state_class=SensorStateClass.MEASUREMENT,
+        value_fn=lambda api: api.flow,
+        available_fn=lambda api: api.flow is not None,
+    ),
+)
+
+
+async def async_setup_entry(
+    hass: HomeAssistant, entry: ConfigEntry, async_add_entities: AddEntitiesCallback
+) -> None:
+    """Set up entities from config entry."""
+    coordinator: HochwasserPortalCoordinator = hass.data[DOMAIN][entry.entry_id]
+
+    async_add_entities(
+        [
+            HochwasserPortalSensor(coordinator, entry, description)
+            for description in SENSOR_TYPES
+            if description.available_fn(coordinator.api)
+            or entry.data.get(CONF_ADD_UNAVAILABLE, False)
+        ]
+    )
+
+
+class HochwasserPortalSensor(
+    CoordinatorEntity[HochwasserPortalCoordinator], SensorEntity
+):
+    """Sensor representation."""
+
+    entity_description: HochwasserPortalSensorEntityDescription
+    _attr_has_entity_name = True
+
+    def __init__(
+        self,
+        coordinator: HochwasserPortalCoordinator,
+        entry: ConfigEntry,
+        description: HochwasserPortalSensorEntityDescription,
+    ) -> None:
+        """Initialize the sensor."""
+        super().__init__(coordinator)
+        self.api = coordinator.api
+        self.entity_description = description
+        self._attr_unique_id = f"{entry.unique_id}_{description.key}"
+        self._attr_device_info = DeviceInfo(
+            identifiers={(DOMAIN, entry.entry_id)},
+            name=f"{entry.title}",
+            configuration_url=self.api.url,
+            manufacturer=f"{ATTR_DATA_PROVIDERS[self.api.ident[:2]]}",
+            model=f"{self.api.ident}",
+        )
+        self._attr_attribution = (
+            f"Data provided by {ATTR_DATA_PROVIDERS[self.api.ident[:2]]}"
+        )
+        LOGGER.debug("Setting up sensor: %s", self._attr_unique_id)
+
+    @property
+    def native_value(self):
+        """Return the state of the sensor."""
+        return self.entity_description.value_fn(self.api)
+
+    @property
+    def extra_state_attributes(self):
+        """Return the state attributes of the sensor."""
+        data = {}
+        if self.api.last_update is not None:
+            data[ATTR_LAST_UPDATE] = self.api.last_update
+        if self.api.url is not None:
+            data[ATTR_URL] = self.api.url
+        if self.api.hint is not None:
+            data[ATTR_HINT] = self.api.hint
+        if bool(data):
+            return data
+        return None
+
+    @property
+    def available(self) -> bool:
+        """Could the device be accessed during the last update call."""
+        return self.entity_description.available_fn(self.api)
diff --git a/custom_components/hochwasserportal/string.json b/custom_components/hochwasserportal/string.json
new file mode 100644
index 0000000..94db910
--- /dev/null
+++ b/custom_components/hochwasserportal/string.json
@@ -0,0 +1,33 @@
+{
+  "config": {
+    "step": {
+      "user": {
+        "description": "To identify the pegel, the pegel ID is required.",
+        "data": {
+          "pegel_identifier": "Pegel ID",
+          "add_unavailable": "Add unavailable entities anyway"
+        }
+      }
+    },
+    "error": {
+      "invalid_identifier": "The specified pegel identifier is invalid."
+    },
+    "abort": {
+      "already_configured": "Pegel is already configured.",
+      "invalid_identifier": "[%key:component::hochwasserportal::config::error::invalid_identifier%]"
+    }
+  },
+  "entity": {
+    "sensor": {
+      "level": {
+        "name": "Level"
+      },
+      "stage": {
+        "name": "Stage"
+      },
+      "flow": {
+        "name": "Flow"
+      }
+    }
+  }
+}
\ No newline at end of file
diff --git a/custom_components/hochwasserportal/translations/de.json b/custom_components/hochwasserportal/translations/de.json
new file mode 100644
index 0000000..2726bbe
--- /dev/null
+++ b/custom_components/hochwasserportal/translations/de.json
@@ -0,0 +1,33 @@
+{
+  "config": {
+    "step": {
+      "user": {
+        "description": "Um den Pegel zu identifizieren, ist die Pegel-ID erforderlich.",
+        "data": {
+          "pegel_identifier": "Pegel ID",
+          "add_unavailable": "Nicht verfügbare Entitäten trotzdem hinzufügen"
+        }
+      }
+    },
+    "error": {
+      "invalid_identifier": "Der angegebene Pegel ist ungültig."
+    },
+    "abort": {
+      "already_configured": "Pegel bereits konfiguriert.",
+      "invalid_identifier": "[%key:component::hochwasserportal::config::error::invalid_identifier%]"
+    }
+  },
+  "entity": {
+    "sensor": {
+      "level": {
+        "name": "Pegelstand"
+      },
+      "stage": {
+        "name": "Warnstufe"
+      },
+      "flow": {
+        "name": "Abfluss"
+      }
+    }
+  }
+}
\ No newline at end of file
diff --git a/custom_components/hochwasserportal/translations/en.json b/custom_components/hochwasserportal/translations/en.json
new file mode 100644
index 0000000..94db910
--- /dev/null
+++ b/custom_components/hochwasserportal/translations/en.json
@@ -0,0 +1,33 @@
+{
+  "config": {
+    "step": {
+      "user": {
+        "description": "To identify the pegel, the pegel ID is required.",
+        "data": {
+          "pegel_identifier": "Pegel ID",
+          "add_unavailable": "Add unavailable entities anyway"
+        }
+      }
+    },
+    "error": {
+      "invalid_identifier": "The specified pegel identifier is invalid."
+    },
+    "abort": {
+      "already_configured": "Pegel is already configured.",
+      "invalid_identifier": "[%key:component::hochwasserportal::config::error::invalid_identifier%]"
+    }
+  },
+  "entity": {
+    "sensor": {
+      "level": {
+        "name": "Level"
+      },
+      "stage": {
+        "name": "Stage"
+      },
+      "flow": {
+        "name": "Flow"
+      }
+    }
+  }
+}
\ No newline at end of file