Recently, more and more power sources have begun to appear that can replace the usual batteries. Their principle of operation is based on the receipt and accumulation of energy from such unusual sources as the heat of the human body, movement of limbs, sound and electromagnetic vibrations.
With the advent of more and more billions of electronic gadgets, sooner or later the problem of the production of power supplies will arise, where, as you know, lithium is used, the reserves of which in the world, alas, are not endless. Perhaps the most accessible alternative source is the heat of the human body.
One of the technologies for the needs of wearable devices from Intel provides for the generation of energy due to the temperature difference between human heat and special clothing. According to the developers, this energy will be quite enough for the operation of a mobile gadget.
Stanford University engineers have proposed a technology for generating energy from captured ultrasonic vibrations. And their colleagues from the Spanish Textile Association have learned how to "extract" electricity from radio waves, which are emitted by sensors sewn into clothing to monitor human health.
And here's another example, when a floor, on which many people walk or dance, can become a source of electricity. In this case, compressive stress is used. Some European nightclubs are already using some of the energy generated by the dancing people.
Another example of the use of squeezing energy: Philips has developed a wireless switch that operates solely with the energy of the finger pressure.