Why a Magnetic Sensor is Needed in a Smartphone

Mobile device sellers rarely specify the presence of a magnetic sensor in a smartphone in the description. They often limit themselves to the term “compass,” implying a single functionality. As a result, the buyer does not fully understand why a magnetic sensor is needed in a smartphone and how it is useful. Let’s briefly explain what it is and what functions it performs.

The magnetic sensor is a small electromagnetic element installed on the smartphone’s circuit board. Its task is to detect electromagnetic radiation coming from outside to the smartphone. Thanks to hardware and software, the device processes the information using algorithms and uses it for the purposes provided by the manufacturer.

Why a Magnetic Sensor is Needed in a Smartphone

The pioneers in applying electromagnetism in mobile devices were mobile phones. Companies like Nokia, Blackberry, and later all other brands installed magnetic sensors for the functionality of a compass in their phones. Thanks to the magnet, it was easy to orient oneself in the terrain. Very practical and convenient.

It is strange that after decades, many manufacturers continue to install a magnetic sensor in smartphones, but there is no “Compass” application in the factory-installed software. It needs to be downloaded and installed separately from the store. This approach is not entirely clear.

What Functions Can a Magnetic Sensor Provide in a Smartphone

The most common way to use a magnetic sensor is to build movement routes in a navigation app. The software simultaneously accesses the GPS module and the electromagnetic sensor, performs calculations, and provides a route. Smartphone manufacturers rarely offer interesting solutions. Therefore, it is better to immediately use third-party programs.

Developers of the official Google store offer an interesting functionality. The smartphone’s magnetic sensor is used as a metal detector. However, its effectiveness depends on many factors:

• Sensor power (depends on the manufacturer and model of the smartphone).
• Material of the phone’s case (plastic is better than metal).
• Software compatibility with the smartphone model (more often supported by common brands).

Full efficiency cannot be guaranteed. The metal detector will work at a distance of 50-200 mm. But this is enough for many to find a lost chain, bracelet, or ring in trash or sand.

The magnetic sensor of a smartphone has found application in entertainment. For example, Google VR glasses work more effectively when creating additional virtual reality. For these purposes, it is recommended to have a magnetic sensor, gyroscope, and accelerometer. The same set is needed for smartphone games if a full-fledged gamepad is required.