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Most Android Devices have a Geomagnetic Field Sensor built in. This sensor provides raw field strength data (in μT) for each of the three coordinate axes. You can also use theese values to program things like Metal Detectors. I programmed one once, if you're interrested in source code let me know.


I looked through the Play Store where i found PocketSensor which says in its description PocketSensor uses your phone's built-in proximity sensor to automatically lock the phone when it is put in a pocket. Example: If you want the sensor to trigger only when the device is being held straight upright (for front pockets) or pointing downwards (for ...

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