What is the Hall sensor in the smartphone and why is it needed?

To implement the correct operation of modern mobile phones use various functional blocks and sensors information. On the basis of their systems higher in the hierarchy, make decisions about certain actions. Today we will talk about the measuring element, determining the presence of a magnetic field, its intensity and change.

An outstanding physicist Edwin Hall in the United States in the late nineteenth century discovered the phenomenon of curvature of the path of the charge carriers in semiconductors, residing in a magnetic field. «Effect» Hall has great potential. With his help, tracked screen orientation in space, the measured magnetic polarity in rocket engines. The sensors work great in contactless switches and the determinants of the level of the liquid.

To measure the voltage of the magnetic field using 2 types of devices: analog and digital sensors. At the first view, the induction field is converted to a voltage, where the magnitude depends on the strength and polarity. The second – when changing polarity and reducing the induction sensor disables the touch screen.

Its main use miniature sensor found in digital gadgets to improve their positioning, to ensure a quick start GPS. A distinctive feature of this device is the versatile mode of action:

  • With it, changes the magnitude of the magnetic flux;
  • is Implemented touchless control via gesture;
  • Automatically adjusts the screen brightness to changing light conditions;
  • Is replaced by the orientation of the image on the display corresponding with the device, manipulation in games and other applications;
  • Is determined by the precise direction.

of Course, this is not the whole list of positive characteristics, inherent to this sensor.

Why the Hall sensor need a smartphone?

A sensor is a highly sensitive part of the broadcaster is located directly under the lid of your smartphone or tablet, allowing you to respond quickly to any changes in the space. Due to the operation of the sensor, saving battery life, improving the interaction of the phone with magnetic case and various accessories.

In the phones «clamshell» also used Hall sensors. Their presence simplifies the job of switching on/off of the screen while opening or closing the protective cover. A similar effect happens to the smartphone with a magnetic case, where the sensor responds to lightning changes (zoom in/out) of the magnetic field on the flip and registers it. During intense radiation, the display locks when they fall will be activated. In this case, the magnet mounted in the flip cover, does not harm the smartphone.

Especially the Hall effect characteristic in a case with a window in the top part of the screen remains open. In this case, it is possible to use separate functions (calls, missed calls, watch, player), without opening the flip. A magnetoelectric device will determine to remain active, the entire display or partial. The same applies to the gadget when you use the covers without the «Windows».

When you purchase a new smartphone to determine the presence or absence of a Hall sensor can be yourself. It should be noted that not all manufacturers indicate his presence, so we need to carefully examine a short list of characteristics. Device find another method, after analyzing cases from their mobile device. For example, on the cover of the Smart Case to your smartphone or tablet 100% there is mounted a Hall sensor. Similar analyses of other cases.

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