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  1. #1
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    Upcoming device charges electronics using WiFi signals

    http://www.ohgizmo.com/2010/01/09/ce...ity-from-wifi/

    I thought this might appeal to some of you. Just imagine, you're camping in the yard of some home, church, or business and are able to charge your cellphone from the surrounding wifi signals (whether the signal is encrypted or not!) without having to go inside and ask for an outlet. It's such an innovative idea, I'm sure it could come in handy often!

  2. #2
    Zoom zoom zoom zoom bonk znomit's Avatar
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    No it doesn't. Wifi is far too weak to provide charging power.
    Read the comments.

  3. #3
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    fool.

  4. #4
    Senior Member Cyclebum's Avatar
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    This technology is moving forward. But from a wifi signal?? Hope it works. The only time I stay in one place long enough for such a gadget to charge anything would be at night. And then I'm either in a motel/campground with outlets, or too far in the boonies to catch a signal. Now from a cell tower, that could be very useful.

    http://money.cnn.com/magazines/busin...04/01/8403349/
    The bicycle is one of the great inventions of mankind. Delights children, challenges young men to feats of daring, and turns old men into boys again.--Me

  5. #5
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    Basically, what this thing is is a separate battery that gets charged from the USB port. The Wifi-charging thing, if it works at all, will be useless because it would take a very, very, very long time to charge that way. That is, it's a useless feature.

    I'm guessing is that the "wifi charging" stuff is just a publicity stunt.


    Quote Originally Posted by Cyclebum View Post
    This technology is moving forward. But from a wifi signal?? Hope it works. The only time I stay in one place long enough for such a gadget to charge anything would be at night. And then I'm either in a motel/campground with outlets, or too far in the boonies to catch a signal. Now from a cell tower, that could be very useful.

    http://money.cnn.com/magazines/busin...04/01/8403349/
    Wireless recharging would only be practical for very, very short distances. You won't see charghing from a cell tower because the cell tower would have to put out millions of times more power than they already do! And the vast majority of that energy is radiated uselessly (very, very little of that energy is received by devices).
    Last edited by njkayaker; 01-18-10 at 09:34 AM.

  6. #6
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    Closest thing I've seen to that is an electrical stream flowing thru an argon stream in the air.Traveled about 10 feet and took 1.2 million volts to pull it off.I think it might take awhile to pull this off because whatever you want to charge is not going to be the shortest path to ground.Would be nice though.
    Everything should be as simple as possible...But not more so.---Albert Einstein

  7. #7
    Collector of Useless Info
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    I have a similar unit that does the same thing with solar energy- charges an internal battery with some fan-out solar cells in about 8 hours of direct sunlight, enough to charge a cell phone once. It works, but not efficiently enough to be practical. A Wifi hotspot has a maximum antenna power of 1 watt- think of the illumination of a 1 watt light bulb compared to direct sunlight.

    I doubt that this device could capture enough energy to overcome the loss in its own battery. It's a marketing hoax.

  8. #8
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    "It's dead Jim..."
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    I have Chuck Norris on speed dial

  9. #9
    Senior Member Laserman's Avatar
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    A total hoax. If the concept was practical why use 1/2 watt wifi signals when commercial tv and radio towers emit 50,000+ watts?
    Set phasers to butt-whup!

  10. #10
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    I go camping to get away from high tech. If this worked, it would be more use for charging commuters lighting systems. With the advances in LEDs I dont need to charge my lights more than twice a year.

  11. #11
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    Quote Originally Posted by AndrewP View Post
    If this worked, it would be more use for charging commuters lighting systems.
    It doesn't work and it doesn't work better than using a wall socket!

    Quote Originally Posted by AndrewP View Post
    With the advances in LEDs I dont need to charge my lights more than twice a year.
    This is a useless statement without more information. How bright is your system? How many hours do you use it?

    It appears that a "bright" system (150 lumens) will run for about 1-2 hours on 2 AA batteries.


    Here's something fairly bright that will run for 3-6 h that takes 6 h to recharge through USB.

    http://www.niterider.com/prod_minewt.shtml
    Last edited by njkayaker; 01-18-10 at 03:41 PM.

  12. #12
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    Some folk have used induction coils near high voltage lines to retrieve power from the air. Unfortunately, power companies call this theft of service and prosecute those clever folk.

  13. #13
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    Quote Originally Posted by kdiehl View Post
    Some folk have used induction coils near high voltage lines to retrieve power from the air. Unfortunately, power companies call this theft of service and prosecute those clever folk.
    A wifi transmitter isn't a high voltage power line.

  14. #14
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    It sure isn't, but power lines are about the only thing around that would have enough "harvestable" energy to be useful. Picowatts of wifi won't do much work.

  15. #15
    ah.... sure. kayakdiver's Avatar
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    pigs will fly before this does.
    Save 15% on your first order at Hammer Nutrition!!

    2010 Giant TCR SL 3
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  16. #16
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    I didn't do my due diligence and now am complicit in RCA's viral marketing. I apologize.

  17. #17
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    You skeptics are all alike. "It'll never work." "It can't work." "Blah, blah, blah..."

    Have you never heard of a flux capacitor? Years ago, it required 1.21 gigawatts of electricity generated by a nuclear reaction to charge. Later advancements allowed charging from a fusion generator powered by garbage. Well, they didn't stop developing it! They now have the charging requirements down to stray WiFi signal levels.

    Don't overcharge it, though. You'll go backwards in time.

  18. #18
    Dirty old man in training
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    Personally, I'm waiting for the next version which will harvest energy from sub-space signals. Of course you could just have a cerebral communicator implanted in your head and avoid the nuisance of having to charge a cell phone altogether.

  19. #19
    Dirty old man in training
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    Seriously, has anyone posted on here about charging a cell phone from a dynamo hub?

  20. #20
    Lentement mais sûrement Erick L's Avatar
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    Quote Originally Posted by Chuck G View Post
    Seriously, has anyone posted on here about charging a cell phone from a dynamo hub?
    http://www.peterwhitecycles.com/ewerk.asp
    http://www.paddedshorts.co.uk/2009/10/pedal-power/
    http://www.tout-terrain.de/2/product...lug/index.html
    Erick - www.borealphoto.com/velo

  21. #21
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    Quote Originally Posted by xyzzy834 View Post
    Have you never heard of a flux capacitor?
    I tried that. Now my bicycle looks like this. http://static.pagenstecher.de/upload...mc12_front.jpg

  22. #22
    Punk Rock Lives Roughstuff's Avatar
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    What we need is a charger which runs off the motion of the bike!
    Electric car sales are on fire! :)

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