diff --git a/custom_components/froeling_lambdatronic_modbus/__init__.py b/custom_components/froeling_lambdatronic_modbus/__init__.py
index c80364f..8daf0d1 100644
--- a/custom_components/froeling_lambdatronic_modbus/__init__.py
+++ b/custom_components/froeling_lambdatronic_modbus/__init__.py
@@ -1,25 +1,46 @@
-
-
 from __future__ import annotations
 
 from homeassistant.config_entries import ConfigEntry
 from homeassistant.core import HomeAssistant
 from homeassistant.const import Platform
+import voluptuous as vol
+import homeassistant.helpers.config_validation as cv
 
 DOMAIN = "froeling_lambdatronic_modbus"
 
-async def async_setup(hass, config):
+CONFIG_SCHEMA = vol.Schema(
+    {
+        DOMAIN: vol.Schema(
+            {
+                vol.Required("name", default="Froeling"): cv.string,
+                vol.Required("host"): cv.string,
+                vol.Required("port", default=502): cv.port,
+                vol.Required("update_interval", default=60): cv.positive_int,
+                vol.Optional("kessel", default=True): cv.boolean,
+                vol.Optional("boiler01", default=True): cv.boolean,
+                vol.Optional("hk01", default=True): cv.boolean,
+                vol.Optional("hk02", default=True): cv.boolean,
+                vol.Optional("austragung", default=True): cv.boolean,
+                vol.Optional("puffer01", default=True): cv.boolean,
+                vol.Optional("zirkulationspumpe", default=True): cv.boolean,
+            }
+        )
+    },
+    extra=vol.ALLOW_EXTRA,
+)
+
+async def async_setup(hass: HomeAssistant, config: dict):
     return True
 
 PLATFORMS = [Platform.SENSOR, Platform.NUMBER, Platform.BINARY_SENSOR]
 
-async def async_setup_entry(hass, entry):
+async def async_setup_entry(hass: HomeAssistant, entry: ConfigEntry):
     hass.data.setdefault(DOMAIN, {})
     hass.data[DOMAIN][entry.entry_id] = entry.data
     await hass.config_entries.async_forward_entry_setups(entry, PLATFORMS)
     return True
 
-async def async_unload_entry(hass, entry):
+async def async_unload_entry(hass: HomeAssistant, entry: ConfigEntry):
     for platform in PLATFORMS:
         await hass.config_entries.async_forward_entry_unload(entry, platform)
     hass.data[DOMAIN].pop(entry.entry_id)
diff --git a/custom_components/froeling_lambdatronic_modbus/binary_sensor.py b/custom_components/froeling_lambdatronic_modbus/binary_sensor.py
index e0d9010..0b98e2b 100644
--- a/custom_components/froeling_lambdatronic_modbus/binary_sensor.py
+++ b/custom_components/froeling_lambdatronic_modbus/binary_sensor.py
@@ -4,7 +4,7 @@ import logging
 from datetime import timedelta
 from homeassistant.helpers.event import async_track_time_interval
 from homeassistant.helpers.translation import async_get_translations
-from const import DOMAIN
+from .const import DOMAIN
 
 _LOGGER = logging.getLogger(__name__)
 
diff --git a/custom_components/froeling_lambdatronic_modbus/number.py b/custom_components/froeling_lambdatronic_modbus/number.py
index 600eef2..3d5eb66 100644
--- a/custom_components/froeling_lambdatronic_modbus/number.py
+++ b/custom_components/froeling_lambdatronic_modbus/number.py
@@ -4,7 +4,7 @@ import logging
 from datetime import timedelta
 from homeassistant.helpers.event import async_track_time_interval
 from homeassistant.helpers.translation import async_get_translations
-from const import DOMAIN
+from .const import DOMAIN
 
 _LOGGER = logging.getLogger(__name__)
 
diff --git a/custom_components/froeling_lambdatronic_modbus/sensor.py b/custom_components/froeling_lambdatronic_modbus/sensor.py
index a08ecb8..38a8866 100644
--- a/custom_components/froeling_lambdatronic_modbus/sensor.py
+++ b/custom_components/froeling_lambdatronic_modbus/sensor.py
@@ -4,7 +4,7 @@ import logging
 from datetime import timedelta
 from homeassistant.helpers.event import async_track_time_interval
 from homeassistant.helpers.translation import async_get_translations
-from const import DOMAIN
+from .const import DOMAIN
 
 _LOGGER = logging.getLogger(__name__)