Make calls with light or radio signals thanks to first battery-free cellphone

July 6, 2017 by  
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Imagine never having to charge your smartphone ever again. We may be one step closer to that battery-free future with new research from University of Washington engineers. They made a phone capable of calling people drawing on light or ambient radio signals. Associate professor Shyam Gollakota said they think it could be the “first functioning cellphone that consumes almost zero power .” No, it’s not magic – the University of Washington’s battery-free cellphone can function on just a few microwatts of power it harvests from RF signals coming from a base station around 31 feet away, or from light via a minute solar cell that’s about the size of a grain of rice. The team constructed their prototype from off-the-shelf components and have already used it to make Skype calls. Related: MIT’s New Battery-Free Chip Captures Energy From Light, Heat, And Vibrations at the Same Time The cellphone prototype is able to run on such low power in part because the team got rid of the step to convert analog signals into digital data – a process that sucks up a lot of power in modern cellphones. Their battery-free phone can make use of small vibrations from the speaker or microphone that come when a person is talking or listening while making a call. According to a university press release, “An antenna connected to those components converts that motion into changes in standard analog radio signal emitted by a cellular base station. This process essentially encodes speech patterns in reflected radio signals in a way that uses almost no power.” The team designed their own base station to receive and transmit radio signals. But that technology could be embedded in cell towers or even Wi-Fi routers in the future. Research associate Vamsi Talla said if every home has a Wi-Fi router – as many already do – “you could get battery-free cellphone coverage everywhere.” The research was recently published in the Proceedings of the Association for Computing Machinery on Interactive, Mobile, Wearable, and Ubiquitous Technologies . The team plans to keep working on the technology to increase the operating range and encrypt conversations. They also aim to stream video on battery-free cellphones. + Battery Free Phone Via the University of Washington Images via Mark Stone/University of Washington

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Make calls with light or radio signals thanks to first battery-free cellphone

Researchers Develop Battery-Free Wireless System to Power Mobile Devices

August 19, 2013 by  
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Anyone with a mobile device has likely experienced the frustration of having to be reliant on a battery . The charge never lasts long enough, and finding a source of electricity on the run is a hassle. Researchers at the University of Washington have come up with a solution to modern tech troubles with their new communication technique called “ ambient backscatter .” The process uses TV and cellular transmissions to connect wireless gadgets so that they communicate with one another, reflect existing signals, and share information. Read the rest of Researchers Develop Battery-Free Wireless System to Power Mobile Devices Permalink | Add to del.icio.us | digg Post tags: ambient backscatter , battery-free , computing machinery’s special interest group on data comminications 2012 , Hong Kong , joshua smith , mobile devices , Seattle , tv tower , university of washington , wireless network        

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Researchers Develop Battery-Free Wireless System to Power Mobile Devices

Energy Scavenging Wireless Nano Sensors Could Provide Battery-Free Devices

June 16, 2011 by  
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A group of researchers have developed the  technology that will lead the way in creating nano sensors that can energize themselves. The  technology will be able power tiny devices by garnering electricity from the tiniest of moments — like the pulse of a vein or blood vessel, a light breeze or the movement of someone walking. They hope to be able to create new devices that can be used as tiny implantable medical sensors, tiny flying surveillance cameras or wearable electronics

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Energy Scavenging Wireless Nano Sensors Could Provide Battery-Free Devices

Paper Pinhole Camera Looks Just Like a Leica

June 16, 2011 by  
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The film camera is becoming more and more of a retro novelty as digital cameras quickly snap up the masses.

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Paper Pinhole Camera Looks Just Like a Leica

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