Battery-less Mobile Technology..the future of cellphone

Here is  a cellphone that  harvests the  ambient energy . What is the Ambient energy? We have a blanket of RF energy surrounded by so many cell towers


Harvesting energy from the environment,is the way to go for future cellphones 

But the cell phones cant be created just by an antenna and signals from it , researchers at University of Washington have their own way to  do that digital communication .

“We’ve built what we believe is the first functioning cellphone that consumes almost zero power,” said co-author Shyam Gollakota

Converting analog signals that to have corresponding  data that a phone can understand consumes so much energy that it’s been impossible to design a phone that can rely on ambient power sources.



They have developed a special way that  takes advantage of tiny vibrations in a phone’s microphone or speaker that occur when a person is talking into a phone.
To transmit speech, the phone uses vibrations from the device’s microphone to encode speech patterns in the reflected signals. To receive speech, it converts encoded radio signals into sound vibrations that that are picked up by the phone’s speaker.


The tech is in its nacent stage , but it is a good start !
 In the prototype device, the user presses a button to switch between these two “transmitting” and “listening” modes.