It is going to take some work as it is not currently that impressive but the experiment at Cornell University shows that power over WiFi is not impossible. The experiment was not all that impressive, they charged a Jawbone headset @ 2.3mA and after 2.5 hours which they managed to charge the battery to 41% over a distance of 5-7cm. Those results are poor compared to Qi and other wireless charging solutions on the market but are promising. The power is transmitted by a wireless router that can also send and receive data so for wireless cameras and other low powered devices which transmit data this could be quite useful. You can read the research paper by following the links from Hack a Day.
"There have been a few reports of power over WiFi (PoWiFi) on the intertubes lately. If this is a real thing it’s definitely going to blow all of the IoT fanboys skirts up (sorry to the rest of you *buzzword* fanboys, the IoT kids flash-mobbed the scene and they mean business)."
Here is some more Tech News from around the web:
- Intel unveils 2016 tablet processor road map, say Taiwan makers @ DigiTimes
- 128GB DDR4 DIMMs have landed so double your RAM cram plan @ The Register
- Samsung Gear VR is good. So good 2016 could be year virtual reality finally makes it @ The Register
- Best Lightweight Linux Distros @ Linux.com
- Microsoft Silverlight gets Firefox reprieve for 64-bit users @ The Inquirer
- Montana Newspaper Plans To Out Anonymous Commenters Retroactively @ Slashdot
Free PoWiFi is offered at
Free PoWiFi is offered at every restaurant in CtPaTown.
https://youtu.be/r7Dtn5_F3Us
There is a lot of criticism
There is a lot of criticism and concerns how GSM affects human health. Also, parents are concerned how regular WiFi installed in schools affects their children. And now we are talking about incredibly strong RF emissions! To charge a battery with 10mA will require to transmit also this 10mA. Anything in between conducting current will be affected and will start to heat. Simply, turn on microwave in kitchen, open its door and stay in front of it.
On other side, WiFi is not unidirectional, antenna must emit in all directions. What about power? 1000 times more! Or directional WiFi. I have to sit at specific place to have signal!
Third. To charge phone battery current of at least 100mA is needed otherwise makes no sense. Standard phone battery is 1Ah meaning it will need at least 10 hour to charge. Are you aware what RF power is needed to get 100mA induction current?
That’s ridiculous, on one side is insisted on power efficiency and on other energy is wasted. Today wireless chargers require device to be placed directly on charger improving efficiency but any distance (here we talk cm) degrades it a lot. After 2 cm efficiency drops to 10-20%, move it a bit on side no charging.
No; no there are no real
No; no there are no real concerns.