Use a NumberSelector and make the interval required, we need a number…

custom_components/myenergi/__init__.py

@@ -84,7 +84,7 @@ async def _async_update_data(self):
         today = today.replace(hour=0, minute=0, second=0, microsecond=0)
         utc_today = dt_util.as_utc(today)
         _LOGGER.debug(
-            f"Refresh histoy local start of day in UTC {utc_today} {utc_today.tzinfo}"
+            f"Refresh history local start of day in UTC {utc_today} {utc_today.tzinfo}"
         )
         try:
             await self.client.refresh()

custom_components/myenergi/config_flow.py

@@ -7,15 +7,23 @@
 from homeassistant.core import callback
 from pymyenergi.client import MyenergiClient
 from pymyenergi.connection import Connection
-from pymyenergi.exceptions import TimeoutException
-from pymyenergi.exceptions import WrongCredentials
+from pymyenergi.exceptions import (
+    TimeoutException,
+    WrongCredentials
+)
 
 from . import SCAN_INTERVAL
-from .const import CONF_PASSWORD
-from .const import CONF_SCAN_INTERVAL
-from .const import CONF_USERNAME
-from .const import DOMAIN
-
+from .const import (
+    CONF_PASSWORD,
+    CONF_SCAN_INTERVAL,
+    CONF_USERNAME,
+    DOMAIN
+)
+
+from homeassistant.helpers.selector import (
+    NumberSelector,
+    NumberSelectorConfig,
+)
 
 _LOGGER: logging.Logger = logging.getLogger(__package__)
 
@@ -111,7 +119,7 @@ async def async_step_user(self, user_input=None):
             step_id="user",
             data_schema=vol.Schema(
                 {
-                    vol.Optional(CONF_SCAN_INTERVAL, default=scan_interval): int,
+                    vol.Required(CONF_SCAN_INTERVAL, default=scan_interval): NumberSelector(NumberSelectorConfig(min=1, max=300, step=1),),
                 }
             ),
         )