01 Aug A cell phone without battery
The world needs more and more energy, so how could we reduce our consumption?
Well, we already think about turn off light when you leave a room but now we could imagine using our cell phone without battery!
In fact, a crew in University of Washington developed a prototype and it works.
They eliminated a power-hungry step in modern cellular transmissions — converting analog signals that convey sound into digital data that a phone can understand.
Instead, the battery-free cellphone takes advantage of tiny vibrations in a phone’s microphone or speaker that occur when a person is talking into a phone or listening to a call.
Have a look on the video:
More informations on:
http://www.washington.edu/news/2017/07/05/first-battery-free-cell-phone-makes-calls-by-harvesting-ambient-power/
https://www.wired.com/story/this-cell-phone-can-make-calls-even-without-a-battery/
https://www.science-et-vie.com/article/ce-telephone-fonctionne-sans-batterie-9130