Ba ery - Free Cellphone
نویسندگان
چکیده
We present the rst baery-free cellphone design that consumes only a few micro-was of power. Our design can sense speech, actuate the earphones, and switch between uplink and downlink communications, all in real time. Our system optimizes transmission and reception of speech while simultaneously harvesting power which enables the baery-free cellphone to operate continuously. e baery-free device prototype is built using commercial-o-the-shelf components on a printed circuit board. It can operate on power that is harvested from RF signals transmied by a basestation 31 feet (9.4 m) away. Further, using power harvested from ambient light with tiny photodiodes, we show that our device can communicate with a basestation that is 50 feet (15.2 m) away. Finally, we perform the rst Skype call using a baery-free phone over a cellular network, via our custom bridged basestation. is we believe is a major leap in the capability of baery-free devices and a step towards a fully functional baery-free cellphone.
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