{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://developer.microsoft.com/schemas/windows-10/sensor-reading.json",
  "title": "Windows 10 Sensor Reading",
  "description": "Schema for Windows 10 sensor readings as defined by the Windows.Devices.Sensors namespace. Covers accelerometer, gyrometer, compass, inclinometer, light sensor, barometer, orientation, pedometer, proximity, and human presence sensor data.",
  "type": "object",
  "properties": {
    "sensorType": {
      "type": "string",
      "enum": [
        "Accelerometer",
        "Gyrometer",
        "Compass",
        "Inclinometer",
        "LightSensor",
        "Barometer",
        "Altimeter",
        "Magnetometer",
        "OrientationSensor",
        "SimpleOrientationSensor",
        "Pedometer",
        "ProximitySensor",
        "ActivitySensor",
        "HumanPresenceSensor",
        "HingeAngleSensor"
      ],
      "description": "The type of sensor"
    },
    "timestamp": {
      "type": "string",
      "format": "date-time",
      "description": "Timestamp of the reading"
    },
    "reading": {
      "oneOf": [
        { "$ref": "#/$defs/AccelerometerReading" },
        { "$ref": "#/$defs/GyrometerReading" },
        { "$ref": "#/$defs/CompassReading" },
        { "$ref": "#/$defs/InclinometerReading" },
        { "$ref": "#/$defs/LightSensorReading" },
        { "$ref": "#/$defs/BarometerReading" },
        { "$ref": "#/$defs/AltimeterReading" },
        { "$ref": "#/$defs/MagnetometerReading" },
        { "$ref": "#/$defs/OrientationReading" },
        { "$ref": "#/$defs/PedometerReading" },
        { "$ref": "#/$defs/ProximityReading" },
        { "$ref": "#/$defs/HumanPresenceReading" },
        { "$ref": "#/$defs/HingeAngleReading" }
      ],
      "description": "The sensor reading data"
    }
  },
  "required": ["sensorType", "timestamp", "reading"],
  "$defs": {
    "AccelerometerReading": {
      "type": "object",
      "description": "Accelerometer reading (AccelerometerReading class)",
      "properties": {
        "accelerationX": {
          "type": "number",
          "format": "double",
          "description": "G-force along the X axis"
        },
        "accelerationY": {
          "type": "number",
          "format": "double",
          "description": "G-force along the Y axis"
        },
        "accelerationZ": {
          "type": "number",
          "format": "double",
          "description": "G-force along the Z axis"
        }
      },
      "required": ["accelerationX", "accelerationY", "accelerationZ"]
    },
    "GyrometerReading": {
      "type": "object",
      "description": "Gyrometer reading (GyrometerReading class)",
      "properties": {
        "angularVelocityX": {
          "type": "number",
          "format": "double",
          "description": "Angular velocity around the X axis in degrees per second"
        },
        "angularVelocityY": {
          "type": "number",
          "format": "double",
          "description": "Angular velocity around the Y axis in degrees per second"
        },
        "angularVelocityZ": {
          "type": "number",
          "format": "double",
          "description": "Angular velocity around the Z axis in degrees per second"
        }
      },
      "required": ["angularVelocityX", "angularVelocityY", "angularVelocityZ"]
    },
    "CompassReading": {
      "type": "object",
      "description": "Compass reading (CompassReading class)",
      "properties": {
        "headingMagneticNorth": {
          "type": "number",
          "format": "double",
          "minimum": 0,
          "maximum": 360,
          "description": "Heading in degrees relative to magnetic north"
        },
        "headingTrueNorth": {
          "type": ["number", "null"],
          "format": "double",
          "minimum": 0,
          "maximum": 360,
          "description": "Heading in degrees relative to true north"
        },
        "headingAccuracy": {
          "type": "string",
          "enum": ["Unknown", "Unreliable", "Approximate", "High"],
          "description": "Magnetometer accuracy (MagnetometerAccuracy)"
        }
      },
      "required": ["headingMagneticNorth"]
    },
    "InclinometerReading": {
      "type": "object",
      "description": "Inclinometer reading (InclinometerReading class)",
      "properties": {
        "pitchDegrees": {
          "type": "number",
          "format": "double",
          "description": "Pitch rotation around the X axis in degrees"
        },
        "rollDegrees": {
          "type": "number",
          "format": "double",
          "description": "Roll rotation around the Y axis in degrees"
        },
        "yawDegrees": {
          "type": "number",
          "format": "double",
          "description": "Yaw rotation around the Z axis in degrees"
        },
        "yawAccuracy": {
          "type": "string",
          "enum": ["Unknown", "Unreliable", "Approximate", "High"]
        }
      },
      "required": ["pitchDegrees", "rollDegrees", "yawDegrees"]
    },
    "LightSensorReading": {
      "type": "object",
      "description": "Light sensor reading (LightSensorReading class)",
      "properties": {
        "illuminanceInLux": {
          "type": "number",
          "format": "float",
          "minimum": 0,
          "description": "Ambient light level in lux"
        },
        "chromaticity": {
          "type": "object",
          "properties": {
            "x": {
              "type": "number",
              "format": "float"
            },
            "y": {
              "type": "number",
              "format": "float"
            }
          },
          "description": "CIE xyY chromaticity coordinates"
        }
      },
      "required": ["illuminanceInLux"]
    },
    "BarometerReading": {
      "type": "object",
      "description": "Barometer reading (BarometerReading class)",
      "properties": {
        "stationPressureInHectopascals": {
          "type": "number",
          "format": "double",
          "minimum": 0,
          "description": "Atmospheric pressure in hectopascals (hPa)"
        }
      },
      "required": ["stationPressureInHectopascals"]
    },
    "AltimeterReading": {
      "type": "object",
      "description": "Altimeter reading (AltimeterReading class)",
      "properties": {
        "altitudeChangeInMeters": {
          "type": "number",
          "format": "double",
          "description": "Change in altitude relative to the first reading"
        }
      },
      "required": ["altitudeChangeInMeters"]
    },
    "MagnetometerReading": {
      "type": "object",
      "description": "Magnetometer reading (MagnetometerReading class)",
      "properties": {
        "magneticFieldX": {
          "type": "number",
          "format": "float",
          "description": "Magnetic field strength along X axis in microteslas"
        },
        "magneticFieldY": {
          "type": "number",
          "format": "float",
          "description": "Magnetic field strength along Y axis in microteslas"
        },
        "magneticFieldZ": {
          "type": "number",
          "format": "float",
          "description": "Magnetic field strength along Z axis in microteslas"
        },
        "directionalAccuracy": {
          "type": "string",
          "enum": ["Unknown", "Unreliable", "Approximate", "High"]
        }
      },
      "required": ["magneticFieldX", "magneticFieldY", "magneticFieldZ"]
    },
    "OrientationReading": {
      "type": "object",
      "description": "Orientation sensor reading (OrientationSensorReading class)",
      "properties": {
        "quaternion": {
          "type": "object",
          "properties": {
            "w": { "type": "number", "format": "float" },
            "x": { "type": "number", "format": "float" },
            "y": { "type": "number", "format": "float" },
            "z": { "type": "number", "format": "float" }
          },
          "required": ["w", "x", "y", "z"],
          "description": "Orientation as a quaternion (SensorQuaternion)"
        },
        "rotationMatrix": {
          "type": "object",
          "properties": {
            "m11": { "type": "number", "format": "float" },
            "m12": { "type": "number", "format": "float" },
            "m13": { "type": "number", "format": "float" },
            "m21": { "type": "number", "format": "float" },
            "m22": { "type": "number", "format": "float" },
            "m23": { "type": "number", "format": "float" },
            "m31": { "type": "number", "format": "float" },
            "m32": { "type": "number", "format": "float" },
            "m33": { "type": "number", "format": "float" }
          },
          "description": "3x3 rotation matrix (SensorRotationMatrix)"
        },
        "yawAccuracy": {
          "type": "string",
          "enum": ["Unknown", "Unreliable", "Approximate", "High"]
        }
      }
    },
    "PedometerReading": {
      "type": "object",
      "description": "Pedometer reading (PedometerReading class)",
      "properties": {
        "cumulativeSteps": {
          "type": "integer",
          "minimum": 0,
          "description": "Total step count since last reset"
        },
        "cumulativeStepsDuration": {
          "type": "string",
          "description": "Total duration of steps"
        },
        "stepKind": {
          "type": "string",
          "enum": ["Unknown", "Walking", "Running"],
          "description": "Type of step (PedometerStepKind)"
        }
      },
      "required": ["cumulativeSteps", "stepKind"]
    },
    "ProximityReading": {
      "type": "object",
      "description": "Proximity sensor reading (ProximitySensorReading class)",
      "properties": {
        "isDetected": {
          "type": "boolean",
          "description": "Whether an object is detected near the sensor"
        },
        "distanceInMillimeters": {
          "type": ["integer", "null"],
          "minimum": 0,
          "description": "Distance to the detected object"
        }
      },
      "required": ["isDetected"]
    },
    "HumanPresenceReading": {
      "type": "object",
      "description": "Human presence sensor reading (HumanPresenceSensorReading class)",
      "properties": {
        "presence": {
          "type": "string",
          "enum": ["Unknown", "Present", "NotPresent"],
          "description": "Whether a human is present (HumanPresence)"
        },
        "engagement": {
          "type": "string",
          "enum": ["Unknown", "Engaged", "Unengaged"],
          "description": "Whether the user is engaged (HumanEngagement)"
        },
        "distanceInMillimeters": {
          "type": ["integer", "null"],
          "description": "Distance to the user"
        },
        "headPosition": {
          "type": "object",
          "properties": {
            "azimuthInDegrees": { "type": "number", "format": "float" },
            "altitudeInDegrees": { "type": "number", "format": "float" }
          },
          "description": "User head position (HeadPosition class)"
        },
        "headOrientation": {
          "type": "object",
          "properties": {
            "pitchInDegrees": { "type": "number", "format": "float" },
            "rollInDegrees": { "type": "number", "format": "float" },
            "yawInDegrees": { "type": "number", "format": "float" }
          },
          "description": "User head orientation (HeadOrientation class)"
        },
        "detectedPersons": {
          "type": "array",
          "items": {
            "type": "object",
            "properties": {
              "engagement": { "type": "string" },
              "distanceInMillimeters": { "type": "integer" },
              "headPosition": { "type": "object" },
              "headOrientation": { "type": "object" }
            }
          },
          "description": "List of detected persons (DetectedPerson class)"
        }
      },
      "required": ["presence"]
    },
    "HingeAngleReading": {
      "type": "object",
      "description": "Hinge angle reading for dual-screen devices (HingeAngleReading class)",
      "properties": {
        "angleInDegrees": {
          "type": "number",
          "format": "double",
          "minimum": 0,
          "maximum": 360,
          "description": "The angle of the hinge in degrees"
        }
      },
      "required": ["angleInDegrees"]
    }
  }
}