Win8 on Intel Programming Course Modern UI : Sensors Cédric Andreolli Intel Software

Sensors

Sensors in few words Sensors convert a physical measure into a signal Sensors are used for Temperature Device Location : GPS Orientation Etc Sensors are used in mobile development since many years They are already available on tablet and on some Ultrabooks

Sensors Why use sensors Using sensors can improve the user experience They are used in games They are used in augmented reality They are used in GPS application A lot of mobile applications use sensors today !

Different kinds of sensors

Sensors Device location GPS is the most popular kind of sensor The GPS acquire the user position from satellites Wi-Fi can also be used (WPS) Give access to : Latitude Longitude Altitude

Sensors Accelerometer Compute the proper acceleration of an object An accelerometer contains 3 sensors : One for the x-axis One for the y-axis One for the z-axis An accelerometer that lay on a table will measure g=-9.81 m/s on the z-axis

Sensors Gyrometer It measures rotational velocity It doesn’t define a position but the current rotation speed Data difficult to use directly

Sensors Magnetometer Measures the strenght of a magnetic field Can be used to compute the device orientation

Sensors Light sensor Measures the intensity of light in Lux Windows 8 uses the light sensor to set the screen luminosity

Sensor fusion

What is the sensor fusion A single sensor do not provide clean data It is very hard to get a stable device orientation The value of a single sensor can suffer from interference Fusionning sensors can help solving this problem

Sensor fusion How does it work ? The fusion of the 3 default sensors gives access to : Compass + Inclinometer + Orientation

Programming with sensors

Access and Rights Some sensors give access to personal information Example : GPS gives the user’s current position You need to activate new capabilities Open the manifest and go to “Capabilities”

Programming with sensors

Windows.Devices.Sensors Namespace that gives access to the sensors. References : Accelerometer Compass Gyrometer Inclinometer LightSensor etc … Use the GetDefault() method to access the device : Var accelerometer = Windows.Devices.Sensors.Accelerometer.GetDefault()

Programming with sensors The Accelerometer Easy to implement Not so easy to use Represent the proper acceleration on each axis Interferences can modify the value Lets see how to retrieve the values of this sensor

Programming with sensors The Accelerometer – full code

Programming with sensors The Light Sensor – full code

Programming with sensors The Location service Implementation of the location service is different Using the location can be very interesting Show some places of interest near your position Indicates your current location to a friend etc … A lot of augmented reality applications use GPS

Programming with sensors

The Location Service – full code

Programming with sensors The Location Service – here’s how it looks

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