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All About Android-Basics of Sensors on Android Platform-ANDROIDKAWE

Basics about the sensors in Android

The sensors add a value to the Android device just like our sense organs add a value to our life. Android platform provide a rich set of sensors which could be use by applications in many ways. This post will describe about the various sensors and its use for applications on android platform.

Most of the sensors will measure the device motion , orientation and environmental changes. Android divide the sensors in two categories.

Hardware Sensors - The hardware sensors are the physical components embedded on the device and measure the environmental changes like acceleration, geomagnetic field strength, and device rotations.

Software Sensors - The software sensors are not embedded as physical components, they are basic derive the sensor values for hardware devices. The software sensors are also known as virtual sensors.
The gravity sensors are the example of software sensors.

According to the usage the android provides the following types of sensors

Motion Sensors
Environmental Sensors
Position Sensors

Its not necessary that all devices have all type of sensors, most of the android devices have accelerometer and magnetometer. The device could also have multiple sensors of same type.

see the list of sensors for android platform with there usage.

Sensor	Type	Description	Common Uses
TYPE_ACCELEROMETER	Hardware	Measures the acceleration force in m/s2that is applied to a device on all three physical axes (x, y, and z), including the force of gravity.	Motion detection (shake, tilt, etc.).
TYPE_AMBIENT_TEMPERATURE	Hardware	Measures the ambient room temperature in degrees Celsius (°C). See note below.	Monitoring air temperatures.
TYPE_GRAVITY	Software or Hardware	Measures the force of gravity in m/s2that is applied to a device on all three physical axes (x, y, z).	Motion detection (shake, tilt, etc.).
TYPE_GYROSCOPE	Hardware	Measures a device's rate of rotation in rad/s around each of the three physical axes (x, y, and z).	Rotation detection (spin, turn, etc.).
TYPE_LIGHT	Hardware	Measures the ambient light level (illumination) in lx.	Controlling screen brightness.
TYPE_LINEAR_ACCELERATION	Software or Hardware	Measures the acceleration force in m/s2that is applied to a device on all three physical axes (x, y, and z), excluding the force of gravity.	Monitoring acceleration along a single axis.
TYPE_MAGNETIC_FIELD	Hardware	Measures the ambient geomagnetic field for all three physical axes (x, y, z) in μT.	Creating a compass.
TYPE_ORIENTATION	Software	Measures degrees of rotation that a device makes around all three physical axes (x, y, z).	Determining device position.
TYPE_PRESSURE	Hardware	Measures the ambient air pressure in hpa or mbar.	Monitoring air pressure changes.
TYPE_PROXIMITY	Hardware	Measures the proximity of an object in cm relative to the view screen of a device. This sensor is typically used to determine whether a handset is being held up to a person's ear.	Phone position during a call.
TYPE_RELATIVE_HUMIDITY	Hardware	Measures the relative ambient humidity in percent (%).	Monitoring dewpoint, absolute, and relative humidity.
TYPE_ROTATION_VECTOR	Software or Hardware	Measures the orientation of a device by providing the three elements of the device's rotation vector.	Motion detection and rotation detection.
TYPE_TEMPERATURE	Hardware	Measures the temperature of the device in degrees Celsius (°C).	Monitoring temperatures.

You can develop very interesting applications around sensors like motion sensor based games, weather applications, motion detection applications, checking your position and much more.

Android provides a complete development framework is android SDK to manage the sensors. Please read the following post to get more details on the android framework.

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Creative Android Apps

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