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This differs from these other electric shoes that yesterday making the rounds. Piezoelectrics are interesting, but just don't give a lot of power for their size. Enough to make a low-power transmitter squirt a few bytes or light led indicator. They are great for collecting external force like the sound and vibration, if you know that the direction and type make you want to crop, there are better ways to go about it.
During harvesting energy from footsteps, you have a pretty good idea how the force will work. And some researchers from the University of Wisconsin-Madison working on a system that could pull as 20W from your support. Why are you strutting, anyway? You think that you are so cool.
Yes, in theory, you can charge the iPad or the authorities of all low-power computer some just by walking around. Of course you could never stop walking, which can ultimately is a good thing. Researchers who have privatized research and sell technology called recovery Nanopower say somewhere around 300W power dissipates as heat, and they think they can siphon a little without messing your gait.
What they have done is enter liquid from tiny metallic microdroplets in a special substrate. When your foot presses down on it, drop a push through the substrate, which generates electricity, known as reverse electrowetting (this is probably a patent, but you can read a paper in nature).
After grabbed energy he may be held to draw at a later time or immediately used to power the device. They offer some sort of relay that will make mobile phone High-power transmission, using low-power signal to send material to the phone, saving battery life. View over specific applications, but you get the idea.
They are several potential problems in the FAQ (squishiness, leaks, cost, etc.), but did not mention weight. I am concerned that the battery and liquid metal to substantially increase the weight. I like light shoes for me, and I'm not sure I would like to add another four or five ounces in each foot suspiciously available power source.
[via UW Madison and Dvice]
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