Along with the familiar camera and microphone, smartphones can pack a slew of other exquisitely sensitive sensors.
Proximity: Measures the distance of other objects from the phone’s touch screen
Light: Gauges the light level in the phone’s environment
Barometer: Measures ambient pressure around the phone
Accelerometer: Measures acceleration of the device’s movement or vibration
Gyroscope: Evaluates degree and direction of a phone’s rotation
Magnetism: Reports the magnetic field intensity around the phone
Gravity: Measures the force of gravity
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