It was not that long ago, just in the first half on the 1990s, when mobile phones were first introduced, being big and expensive. All you could do with them was to make phone calls. Since then mobile devices have experienced ...

This document describes and explains the creation of an APP for Android, which detects ultrasound waves and indicates proximity to the source, as well as a product or brand associated to the acoustic signal. In order to ...

The use of smartphones has become essential for any day-to-day activity since everything that is needed is within easy reach with these devices. Most of the applications are free and allow to reach many more people than ...