Soon we will start living in the "Internet of things", and our own tiny sensors will be built into the objects of the city infrastructure. They will transmit information over wireless networks, and most of them do not need traditional sources of energy for continuous operation. First, some of these devices can be equipped with solar cells. Secondly, some sensors can be powered by tiny piezo generators that convert mechanical vibrations into electricity.
Of course, working with a headset prototype in the form of a printed circuit board, which is consistently switched between the receiving and transmitting mode, it is difficult to call "a viable product," but the authors of the development are confident that in the future such principles can find application in serial devices. For full-fledged operation with powerful smartphones, such a power source is not enough, but make an emergency call with a discharged battery should work.
British scientists are also considering another way of powering smartphones - with the help of supercapacitors, which are charged in a matter of minutes.
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