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Environmental Sensors

Ambient Temperature

Supported in Android.
Measures the ambient room temperature in degrees Celsius.
Temperature: Ambient air temperature. Internally stored as temp_c.
Accuracy: Same as Accuracy in Accelerometer.

Light

Supported in Android.
Measures the ambient light level (illumination) in lx.
Each light record includes the following:
Illuminance: Illuminance, in lx. Internally stored as illuminance_lx.
Accuracy: Same as Accuracy in Accelerometer.

Pressure

Supported on Android & iOS.
Measures the ambient air pressure in hPa or mbar. Usually used for monitoring air pressure changes.
Each pressure record includes the following:
Pressure: Ambient air pressure, in hPa or mbar. Internally stored as pressure_hpa.
Accuracy: Same as Accuracy in Accelerometer.

Proximity

Supported on Android.
Measures the proximity of an object in cm relative to the view screen of a device. Typically is used to determine whether a handset is being held up to a person's ear.
Each proximity record includes the following:
Distance: Distance from an object, in centimeters. Internally stored as dist_cm.
Accuracy: Same as Accuracy in Accelerometer.

Relative Humidity

Supported on Android.
Measures the relative ambient humidity in percent (%).
Each relative humidity record includes the following:
Humidity: Ambient relative humidity, in percent. Internally stored as humidity_percent.
Accuracy:
Same as Accuracy in Accelerometer.