Fix tilt calculation for HomeKit cover devices (#123532)

homeassistant/components/homekit_controller/cover.py

@@ -214,34 +214,32 @@ class HomeKitWindowCover(HomeKitEntity, CoverEntity):
     @property
     def current_cover_tilt_position(self) -> int | None:
         """Return current position of cover tilt."""
-        tilt_position = self.service.value(CharacteristicsTypes.VERTICAL_TILT_CURRENT)
-        if not tilt_position:
-            tilt_position = self.service.value(
-                CharacteristicsTypes.HORIZONTAL_TILT_CURRENT
-            )
-        if tilt_position is None:
-            return None
-        # Recalculate to convert from arcdegree scale to percentage scale.
         if self.is_vertical_tilt:
-            scale = 0.9
+            char = self.service[CharacteristicsTypes.VERTICAL_TILT_CURRENT]
-            if (
-                self.service[CharacteristicsTypes.VERTICAL_TILT_CURRENT].minValue == -90
-                and self.service[CharacteristicsTypes.VERTICAL_TILT_CURRENT].maxValue
-                == 0
-            ):
-                scale = -0.9
-            tilt_position = int(tilt_position / scale)
         elif self.is_horizontal_tilt:
-            scale = 0.9
+            char = self.service[CharacteristicsTypes.HORIZONTAL_TILT_CURRENT]
-            if (
+        else:
-                self.service[CharacteristicsTypes.HORIZONTAL_TILT_TARGET].minValue
+            return None
-                == -90
+
-                and self.service[CharacteristicsTypes.HORIZONTAL_TILT_TARGET].maxValue
+        # Recalculate tilt_position. Convert arc to percent scale based on min/max values.
-                == 0
+        tilt_position = char.value
-            ):
+        min_value = char.minValue
-                scale = -0.9
+        max_value = char.maxValue
-            tilt_position = int(tilt_position / scale)
+        total_range = int(max_value or 0) - int(min_value or 0)
-        return tilt_position
+
+        if (
+            tilt_position is None
+            or min_value is None
+            or max_value is None
+            or total_range <= 0
+        ):
+            return None
+
+        # inverted scale
+        if min_value == -90 and max_value == 0:
+            return abs(int(100 / total_range * (tilt_position - max_value)))
+        # normal scale
+        return abs(int(100 / total_range * (tilt_position - min_value)))
 
     async def async_stop_cover(self, **kwargs: Any) -> None:
         """Send hold command."""
@@ -265,34 +263,32 @@ class HomeKitWindowCover(HomeKitEntity, CoverEntity):
     async def async_set_cover_tilt_position(self, **kwargs: Any) -> None:
         """Move the cover tilt to a specific position."""
         tilt_position = kwargs[ATTR_TILT_POSITION]
+
         if self.is_vertical_tilt:
-            # Recalculate to convert from percentage scale to arcdegree scale.
+            char = self.service[CharacteristicsTypes.VERTICAL_TILT_TARGET]
-            scale = 0.9
-            if (
-                self.service[CharacteristicsTypes.VERTICAL_TILT_TARGET].minValue == -90
-                and self.service[CharacteristicsTypes.VERTICAL_TILT_TARGET].maxValue
-                == 0
-            ):
-                scale = -0.9
-            tilt_position = int(tilt_position * scale)
-            await self.async_put_characteristics(
-                {CharacteristicsTypes.VERTICAL_TILT_TARGET: tilt_position}
-            )
         elif self.is_horizontal_tilt:
-            # Recalculate to convert from percentage scale to arcdegree scale.
+            char = self.service[CharacteristicsTypes.HORIZONTAL_TILT_TARGET]
-            scale = 0.9
+
-            if (
+        # Calculate tilt_position. Convert from 1-100 scale to arc degree scale respecting possible min/max Values.
-                self.service[CharacteristicsTypes.HORIZONTAL_TILT_TARGET].minValue
+        min_value = char.minValue
-                == -90
+        max_value = char.maxValue
-                and self.service[CharacteristicsTypes.HORIZONTAL_TILT_TARGET].maxValue
+        if min_value is None or max_value is None:
-                == 0
+            raise ValueError(
-            ):
+                "Entity does not provide minValue and maxValue for the tilt"
-                scale = -0.9
-            tilt_position = int(tilt_position * scale)
-            await self.async_put_characteristics(
-                {CharacteristicsTypes.HORIZONTAL_TILT_TARGET: tilt_position}
             )
 
+        # inverted scale
+        if min_value == -90 and max_value == 0:
+            tilt_position = int(
+                tilt_position / 100 * (min_value - max_value) + max_value
+            )
+        else:
+            tilt_position = int(
+                tilt_position / 100 * (max_value - min_value) + min_value
+            )
+
+        await self.async_put_characteristics({char.type: tilt_position})
+
     @property
     def extra_state_attributes(self) -> dict[str, Any]:
         """Return the optional state attributes."""

tests/components/homekit_controller/fixtures/somfy_venetian_blinds.json

@@ -0,0 +1,146 @@
+[
+  {
+    "aid": 1,
+    "services": [
+      {
+        "iid": 1,
+        "type": "0000003E-0000-1000-8000-0026BB765291",
+        "characteristics": [
+          {
+            "type": "00000023-0000-1000-8000-0026BB765291",
+            "iid": 2,
+            "perms": ["pr"],
+            "format": "string",
+            "value": "VELUX Internal Cover",
+            "description": "Name",
+            "maxLen": 64
+          },
+          {
+            "type": "00000020-0000-1000-8000-0026BB765291",
+            "iid": 3,
+            "perms": ["pr"],
+            "format": "string",
+            "value": "Netatmo",
+            "description": "Manufacturer",
+            "maxLen": 64
+          },
+          {
+            "type": "00000021-0000-1000-8000-0026BB765291",
+            "iid": 4,
+            "perms": ["pr"],
+            "format": "string",
+            "value": "VELUX Internal Cover",
+            "description": "Model",
+            "maxLen": 64
+          },
+          {
+            "type": "00000030-0000-1000-8000-0026BB765291",
+            "iid": 5,
+            "perms": ["pr"],
+            "format": "string",
+            "value": "**REDACTED**",
+            "description": "Serial Number",
+            "maxLen": 64
+          },
+          {
+            "type": "00000014-0000-1000-8000-0026BB765291",
+            "iid": 7,
+            "perms": ["pw"],
+            "format": "bool",
+            "description": "Identify"
+          },
+          {
+            "type": "00000052-0000-1000-8000-0026BB765291",
+            "iid": 6,
+            "perms": ["pr"],
+            "format": "string",
+            "value": "0.0.0",
+            "description": "Firmware Revision",
+            "maxLen": 64
+          },
+          {
+            "type": "00000220-0000-1000-8000-0026BB765291",
+            "iid": 15,
+            "perms": ["pr"],
+            "format": "data",
+            "value": "+nvrOv1cCQU="
+          }
+        ]
+      },
+      {
+        "iid": 8,
+        "type": "0000008C-0000-1000-8000-0026BB765291",
+        "characteristics": [
+          {
+            "type": "00000023-0000-1000-8000-0026BB765291",
+            "iid": 9,
+            "perms": ["pr"],
+            "format": "string",
+            "value": "Venetian Blinds",
+            "description": "Name",
+            "maxLen": 64
+          },
+          {
+            "type": "0000007C-0000-1000-8000-0026BB765291",
+            "iid": 11,
+            "perms": ["pr", "pw", "ev"],
+            "format": "uint8",
+            "value": 0,
+            "description": "Target Position",
+            "unit": "percentage",
+            "minValue": 0,
+            "maxValue": 100,
+            "minStep": 1
+          },
+          {
+            "type": "0000006D-0000-1000-8000-0026BB765291",
+            "iid": 10,
+            "perms": ["pr", "ev"],
+            "format": "uint8",
+            "value": 0,
+            "description": "Current Position",
+            "unit": "percentage",
+            "minValue": 0,
+            "maxValue": 100,
+            "minStep": 1
+          },
+          {
+            "type": "00000072-0000-1000-8000-0026BB765291",
+            "iid": 12,
+            "perms": ["pr", "ev"],
+            "format": "uint8",
+            "value": 2,
+            "description": "Position State",
+            "minValue": 0,
+            "maxValue": 2,
+            "minStep": 1
+          },
+          {
+            "type": "0000006C-0000-1000-8000-0026BB765291",
+            "iid": 13,
+            "perms": ["pr", "ev"],
+            "format": "int",
+            "value": 90,
+            "description": "Current Horizontal Tilt Angle",
+            "unit": "arcdegrees",
+            "minValue": -90,
+            "maxValue": 90,
+            "minStep": 1
+          },
+          {
+            "type": "0000007B-0000-1000-8000-0026BB765291",
+            "iid": 14,
+            "perms": ["pr", "pw", "ev"],
+            "format": "int",
+            "value": 90,
+            "description": "Target Horizontal Tilt Angle",
+            "unit": "arcdegrees",
+            "minValue": -90,
+            "maxValue": 90,
+            "minStep": 1
+          }
+        ]
+      }
+    ]
+  }
+]

tests/components/homekit_controller/fixtures/velux_active_netatmo_co2.json

@@ -0,0 +1,162 @@
+[
+  {
+    "aid": 1,
+    "services": [
+      {
+        "iid": 1,
+        "type": "0000003E-0000-1000-8000-0026BB765291",
+        "characteristics": [
+          {
+            "type": "00000023-0000-1000-8000-0026BB765291",
+            "iid": 2,
+            "perms": ["pr"],
+            "format": "string",
+            "value": "VELUX Sensor",
+            "description": "Name",
+            "maxLen": 64
+          },
+          {
+            "type": "00000020-0000-1000-8000-0026BB765291",
+            "iid": 3,
+            "perms": ["pr"],
+            "format": "string",
+            "value": "Netatmo",
+            "description": "Manufacturer",
+            "maxLen": 64
+          },
+          {
+            "type": "00000021-0000-1000-8000-0026BB765291",
+            "iid": 4,
+            "perms": ["pr"],
+            "format": "string",
+            "value": "VELUX Sensor",
+            "description": "Model",
+            "maxLen": 64
+          },
+          {
+            "type": "00000030-0000-1000-8000-0026BB765291",
+            "iid": 5,
+            "perms": ["pr"],
+            "format": "string",
+            "value": "**REDACTED**",
+            "description": "Serial Number",
+            "maxLen": 64
+          },
+          {
+            "type": "00000014-0000-1000-8000-0026BB765291",
+            "iid": 7,
+            "perms": ["pw"],
+            "format": "bool",
+            "description": "Identify"
+          },
+          {
+            "type": "00000052-0000-1000-8000-0026BB765291",
+            "iid": 6,
+            "perms": ["pr"],
+            "format": "string",
+            "value": "16.0.0",
+            "description": "Firmware Revision",
+            "maxLen": 64
+          },
+          {
+            "type": "00000220-0000-1000-8000-0026BB765291",
+            "iid": 18,
+            "perms": ["pr"],
+            "format": "data",
+            "value": "+nvrOv1cCQU="
+          }
+        ]
+      },
+      {
+        "iid": 8,
+        "type": "0000008A-0000-1000-8000-0026BB765291",
+        "characteristics": [
+          {
+            "type": "00000023-0000-1000-8000-0026BB765291",
+            "iid": 9,
+            "perms": ["pr"],
+            "format": "string",
+            "value": "Temperature sensor",
+            "description": "Name",
+            "maxLen": 64
+          },
+          {
+            "type": "00000011-0000-1000-8000-0026BB765291",
+            "iid": 10,
+            "perms": ["pr", "ev"],
+            "format": "float",
+            "value": 23.9,
+            "description": "Current Temperature",
+            "unit": "celsius",
+            "minValue": 0.0,
+            "maxValue": 50.0,
+            "minStep": 0.1
+          }
+        ]
+      },
+      {
+        "iid": 11,
+        "type": "00000082-0000-1000-8000-0026BB765291",
+        "characteristics": [
+          {
+            "type": "00000023-0000-1000-8000-0026BB765291",
+            "iid": 12,
+            "perms": ["pr"],
+            "format": "string",
+            "value": "Humidity sensor",
+            "description": "Name",
+            "maxLen": 64
+          },
+          {
+            "type": "00000010-0000-1000-8000-0026BB765291",
+            "iid": 13,
+            "perms": ["pr", "ev"],
+            "format": "float",
+            "value": 69.0,
+            "description": "Current Relative Humidity",
+            "unit": "percentage",
+            "minValue": 0.0,
+            "maxValue": 100.0,
+            "minStep": 1.0
+          }
+        ]
+      },
+      {
+        "iid": 14,
+        "type": "00000097-0000-1000-8000-0026BB765291",
+        "characteristics": [
+          {
+            "type": "00000023-0000-1000-8000-0026BB765291",
+            "iid": 15,
+            "perms": ["pr"],
+            "format": "string",
+            "value": "Carbon Dioxide sensor",
+            "description": "Name",
+            "maxLen": 64
+          },
+          {
+            "type": "00000092-0000-1000-8000-0026BB765291",
+            "iid": 16,
+            "perms": ["pr", "ev"],
+            "format": "uint8",
+            "value": 0,
+            "description": "Carbon Dioxide Detected",
+            "minValue": 0,
+            "maxValue": 1,
+            "minStep": 1
+          },
+          {
+            "type": "00000093-0000-1000-8000-0026BB765291",
+            "iid": 17,
+            "perms": ["pr", "ev"],
+            "format": "float",
+            "value": 1124.0,
+            "description": "Carbon Dioxide Level",
+            "minValue": 0.0,
+            "maxValue": 5000.0
+          }
+        ]
+      }
+    ]
+  }
+]

tests/components/homekit_controller/fixtures/velux_window.json

@@ -0,0 +1,122 @@
+[
+  {
+    "aid": 1,
+    "services": [
+      {
+        "iid": 1,
+        "type": "0000003E-0000-1000-8000-0026BB765291",
+        "characteristics": [
+          {
+            "type": "00000023-0000-1000-8000-0026BB765291",
+            "iid": 2,
+            "perms": ["pr"],
+            "format": "string",
+            "value": "VELUX Window",
+            "description": "Name",
+            "maxLen": 64
+          },
+          {
+            "type": "00000020-0000-1000-8000-0026BB765291",
+            "iid": 3,
+            "perms": ["pr"],
+            "format": "string",
+            "value": "Netatmo",
+            "description": "Manufacturer",
+            "maxLen": 64
+          },
+          {
+            "type": "00000021-0000-1000-8000-0026BB765291",
+            "iid": 4,
+            "perms": ["pr"],
+            "format": "string",
+            "value": "VELUX Window",
+            "description": "Model",
+            "maxLen": 64
+          },
+          {
+            "type": "00000030-0000-1000-8000-0026BB765291",
+            "iid": 5,
+            "perms": ["pr"],
+            "format": "string",
+            "value": "**REDACTED**",
+            "description": "Serial Number",
+            "maxLen": 64
+          },
+          {
+            "type": "00000014-0000-1000-8000-0026BB765291",
+            "iid": 7,
+            "perms": ["pw"],
+            "format": "bool",
+            "description": "Identify"
+          },
+          {
+            "type": "00000052-0000-1000-8000-0026BB765291",
+            "iid": 6,
+            "perms": ["pr"],
+            "format": "string",
+            "value": "0.0.0",
+            "description": "Firmware Revision",
+            "maxLen": 64
+          },
+          {
+            "type": "00000220-0000-1000-8000-0026BB765291",
+            "iid": 13,
+            "perms": ["pr"],
+            "format": "data",
+            "value": "+nvrOv1cCQU="
+          }
+        ]
+      },
+      {
+        "iid": 8,
+        "type": "0000008B-0000-1000-8000-0026BB765291",
+        "characteristics": [
+          {
+            "type": "00000023-0000-1000-8000-0026BB765291",
+            "iid": 9,
+            "perms": ["pr"],
+            "format": "string",
+            "value": "Roof Window",
+            "description": "Name",
+            "maxLen": 64
+          },
+          {
+            "type": "0000007C-0000-1000-8000-0026BB765291",
+            "iid": 11,
+            "perms": ["pr", "pw", "ev"],
+            "format": "uint8",
+            "value": 0,
+            "description": "Target Position",
+            "unit": "percentage",
+            "minValue": 0,
+            "maxValue": 100,
+            "minStep": 1
+          },
+          {
+            "type": "0000006D-0000-1000-8000-0026BB765291",
+            "iid": 10,
+            "perms": ["pr", "ev"],
+            "format": "uint8",
+            "value": 0,
+            "description": "Current Position",
+            "unit": "percentage",
+            "minValue": 0,
+            "maxValue": 100,
+            "minStep": 1
+          },
+          {
+            "type": "00000072-0000-1000-8000-0026BB765291",
+            "iid": 12,
+            "perms": ["pr", "ev"],
+            "format": "uint8",
+            "value": 2,
+            "description": "Position State",
+            "minValue": 0,
+            "maxValue": 2,
+            "minStep": 1
+          }
+        ]
+      }
+    ]
+  }
+]

tests/components/homekit_controller/fixtures/velux_window_cover.json

@@ -0,0 +1,122 @@
+[
+  {
+    "aid": 1,
+    "services": [
+      {
+        "iid": 1,
+        "type": "0000003E-0000-1000-8000-0026BB765291",
+        "characteristics": [
+          {
+            "type": "00000023-0000-1000-8000-0026BB765291",
+            "iid": 2,
+            "perms": ["pr"],
+            "format": "string",
+            "value": "VELUX External Cover",
+            "description": "Name",
+            "maxLen": 64
+          },
+          {
+            "type": "00000020-0000-1000-8000-0026BB765291",
+            "iid": 3,
+            "perms": ["pr"],
+            "format": "string",
+            "value": "Netatmo",
+            "description": "Manufacturer",
+            "maxLen": 64
+          },
+          {
+            "type": "00000021-0000-1000-8000-0026BB765291",
+            "iid": 4,
+            "perms": ["pr"],
+            "format": "string",
+            "value": "VELUX External Cover",
+            "description": "Model",
+            "maxLen": 64
+          },
+          {
+            "type": "00000030-0000-1000-8000-0026BB765291",
+            "iid": 5,
+            "perms": ["pr"],
+            "format": "string",
+            "value": "**REDACTED**",
+            "description": "Serial Number",
+            "maxLen": 64
+          },
+          {
+            "type": "00000014-0000-1000-8000-0026BB765291",
+            "iid": 7,
+            "perms": ["pw"],
+            "format": "bool",
+            "description": "Identify"
+          },
+          {
+            "type": "00000052-0000-1000-8000-0026BB765291",
+            "iid": 6,
+            "perms": ["pr"],
+            "format": "string",
+            "value": "15.0.0",
+            "description": "Firmware Revision",
+            "maxLen": 64
+          },
+          {
+            "type": "00000220-0000-1000-8000-0026BB765291",
+            "iid": 13,
+            "perms": ["pr"],
+            "format": "data",
+            "value": "+nvrOv1cCQU="
+          }
+        ]
+      },
+      {
+        "iid": 8,
+        "type": "0000008C-0000-1000-8000-0026BB765291",
+        "characteristics": [
+          {
+            "type": "00000023-0000-1000-8000-0026BB765291",
+            "iid": 9,
+            "perms": ["pr"],
+            "format": "string",
+            "value": "Awning Blinds",
+            "description": "Name",
+            "maxLen": 64
+          },
+          {
+            "type": "0000007C-0000-1000-8000-0026BB765291",
+            "iid": 11,
+            "perms": ["pr", "pw", "ev"],
+            "format": "uint8",
+            "value": 0,
+            "description": "Target Position",
+            "unit": "percentage",
+            "minValue": 0,
+            "maxValue": 100,
+            "minStep": 1
+          },
+          {
+            "type": "0000006D-0000-1000-8000-0026BB765291",
+            "iid": 10,
+            "perms": ["pr", "ev"],
+            "format": "uint8",
+            "value": 0,
+            "description": "Current Position",
+            "unit": "percentage",
+            "minValue": 0,
+            "maxValue": 100,
+            "minStep": 1
+          },
+          {
+            "type": "00000072-0000-1000-8000-0026BB765291",
+            "iid": 12,
+            "perms": ["pr", "ev"],
+            "format": "uint8",
+            "value": 2,
+            "description": "Position State",
+            "minValue": 0,
+            "maxValue": 2,
+            "minStep": 1
+          }
+        ]
+      }
+    ]
+  }
+]

tests/components/homekit_controller/test_cover.py

@@ -116,6 +116,32 @@ def create_window_covering_service_with_none_tilt(accessory: Accessory) -> None:
     tilt_target.maxValue = 0
 
 
+def create_window_covering_service_with_no_minmax_tilt(accessory):
+    """Apply use values (-90 to 90) if min/max not provided."""
+    service = create_window_covering_service(accessory)
+
+    tilt_current = service.add_char(CharacteristicsTypes.HORIZONTAL_TILT_CURRENT)
+    tilt_current.value = 0
+
+    tilt_target = service.add_char(CharacteristicsTypes.HORIZONTAL_TILT_TARGET)
+    tilt_target.value = 0
+
+
+def create_window_covering_service_with_full_range_tilt(accessory):
+    """Somfi Velux Integration."""
+    service = create_window_covering_service(accessory)
+
+    tilt_current = service.add_char(CharacteristicsTypes.HORIZONTAL_TILT_CURRENT)
+    tilt_current.value = 0
+    tilt_current.minValue = -90
+    tilt_current.maxValue = 90
+
+    tilt_target = service.add_char(CharacteristicsTypes.HORIZONTAL_TILT_TARGET)
+    tilt_target.value = 0
+    tilt_target.minValue = -90
+    tilt_target.maxValue = 90
+
+
 async def test_change_window_cover_state(
     hass: HomeAssistant, get_next_aid: Callable[[], int]
 ) -> None:
@@ -267,6 +293,40 @@ async def test_read_window_cover_tilt_missing_tilt(
     assert state.state != STATE_UNAVAILABLE
 
 
+async def test_read_window_cover_tilt_full_range(
+    hass: HomeAssistant, get_next_aid: Callable[[], int]
+) -> None:
+    """Test that horizontal tilt is handled correctly."""
+    helper = await setup_test_component(
+        hass, get_next_aid(), create_window_covering_service_with_full_range_tilt
+    )
+
+    await helper.async_update(
+        ServicesTypes.WINDOW_COVERING,
+        {CharacteristicsTypes.HORIZONTAL_TILT_CURRENT: 0},
+    )
+    state = await helper.poll_and_get_state()
+    # Expect converted value from arcdegree scale to percentage scale.
+    assert state.attributes["current_tilt_position"] == 50
+
+
+async def test_read_window_cover_tilt_no_minmax(
+    hass: HomeAssistant, get_next_aid: Callable[[], int]
+) -> None:
+    """Test that horizontal tilt is handled correctly."""
+    helper = await setup_test_component(
+        hass, get_next_aid(), create_window_covering_service_with_no_minmax_tilt
+    )
+
+    await helper.async_update(
+        ServicesTypes.WINDOW_COVERING,
+        {CharacteristicsTypes.HORIZONTAL_TILT_CURRENT: 90},
+    )
+    state = await helper.poll_and_get_state()
+    # Expect converted value from arcdegree scale to percentage scale.
+    assert state.attributes["current_tilt_position"] == 100
+
+
 async def test_write_window_cover_tilt_horizontal(
     hass: HomeAssistant, get_next_aid: Callable[[], int]
 ) -> None:
@@ -359,6 +419,29 @@ async def test_write_window_cover_tilt_vertical_2(
     )
 
 
+async def test_write_window_cover_tilt_no_minmax(
+    hass: HomeAssistant, get_next_aid: Callable[[], int]
+) -> None:
+    """Test that horizontal tilt is written correctly."""
+    helper = await setup_test_component(
+        hass, get_next_aid(), create_window_covering_service_with_no_minmax_tilt
+    )
+
+    await hass.services.async_call(
+        "cover",
+        "set_cover_tilt_position",
+        {"entity_id": helper.entity_id, "tilt_position": 90},
+        blocking=True,
+    )
+    # Expect converted value from percentage scale to arcdegree scale.
+    helper.async_assert_service_values(
+        ServicesTypes.WINDOW_COVERING,
+        {
+            CharacteristicsTypes.HORIZONTAL_TILT_TARGET: 72,
+        },
+    )
+
+
 async def test_window_cover_stop(
     hass: HomeAssistant, get_next_aid: Callable[[], int]
 ) -> None:
@@ -378,6 +461,57 @@ async def test_window_cover_stop(
     )
 
 
+async def test_write_window_cover_tilt_full_range(
+    hass: HomeAssistant, get_next_aid: Callable[[], int]
+) -> None:
+    """Test that full-range tilt is working correctly."""
+    helper = await setup_test_component(
+        hass, get_next_aid(), create_window_covering_service_with_full_range_tilt
+    )
+
+    await hass.services.async_call(
+        "cover",
+        "set_cover_tilt_position",
+        {"entity_id": helper.entity_id, "tilt_position": 10},
+        blocking=True,
+    )
+    # Expect converted value from percentage scale to arc on -90 to +90 scale.
+    helper.async_assert_service_values(
+        ServicesTypes.WINDOW_COVERING,
+        {
+            CharacteristicsTypes.HORIZONTAL_TILT_TARGET: -72,
+        },
+    )
+
+    await hass.services.async_call(
+        "cover",
+        "set_cover_tilt_position",
+        {"entity_id": helper.entity_id, "tilt_position": 50},
+        blocking=True,
+    )
+    # Expect converted value from percentage scale to arc on -90 to +90 scale.
+    helper.async_assert_service_values(
+        ServicesTypes.WINDOW_COVERING,
+        {
+            CharacteristicsTypes.HORIZONTAL_TILT_TARGET: 0,
+        },
+    )
+
+    await hass.services.async_call(
+        "cover",
+        "set_cover_tilt_position",
+        {"entity_id": helper.entity_id, "tilt_position": 90},
+        blocking=True,
+    )
+    # Expect converted value from percentage scale to arc on -90 to +90 scale.
+    helper.async_assert_service_values(
+        ServicesTypes.WINDOW_COVERING,
+        {
+            CharacteristicsTypes.HORIZONTAL_TILT_TARGET: 72,
+        },
+    )
+
+
 def create_garage_door_opener_service(accessory: Accessory) -> None:
     """Define a garage-door-opener chars as per page 217 of HAP spec."""
     service = accessory.add_service(ServicesTypes.GARAGE_DOOR_OPENER)