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yea I think im gonna go with the piezo in my shoe. although a electromagnetic generator would make more power, a lot of ppl are going to be doing projects around that idea and it might be cool to try something different. I could also see how much walking it would take to make any useful electricty. I understand basic electronics, but I really have no idea how to improvise a storing device for electricty from a piezo. iff someone would be kind enough to post a schematic for a device to properly store the electricty, that would be awsome. also just hints about how to improvise this device would be cool aswell. thanks for your time.
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
Although a piezo device could be used as you imagine your results will I think be disappointing compared to a magnet/coil setup (like in the 'shake-to-light' torches)
If you can get 'Brownie points' for a novel approach then go ahead.
Your main problem will be using the power generated by the piezo-generator low current at high voltage, almost approaching static electricity.
How about air bladders in the shoes with valves that pressurise a container such as a plastic soft-drink bottle you could use the compressed air to turn the bottle into a rocket or power a steam engine- or turbine-like motor? Cushioned shoes ( like Nike Air) and alternative energy.
Registered Member #350
Joined: Mon Mar 27 2006, 05:14PM
Location:
Posts: 106
I could also think of some other interesting ways to generate power your teacher might like.
The human body produces a lot of heat energy all the time. You could convert some of that energy into electricity by using a thermocouple. A peltier cooler should work too and is available at any computer store. Just attach it to your body. The higher the temperature difference between the two sides of the device the more power is generated.
If you want to use the energy of walking there is another place to put a generator besides of the shoes. In your pants. At the hip joint. There is also more space then there is in a shoe so the generator can be bigger.
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
You could convert some of that energy into electricity by using a thermocouple. A peltier cooler should work too and is available at any computer store. Just attach it to your body. The higher the temperature difference between the two sides of the device the more power is generated.
Tought about it - no chance - figuring the power produced by a single peltier that way, you would need a whole suit of those to produce a watt or so to charge your phone.
All cells would need to fit snugly with body to work, otherwise they would just represent a loss. Also, it would work inly in cold chlimate where temperatue difference is significant - in summer, it wouldn't work at all... If it was practical, somebody would have done it already!
I can barely light a light a led for a short time and with help of a joule theif. Produced voltage is 150 milivolts!
Electromagnetic shoes are by way most efficient way to go. Piezo's are mechanically sensitive and much more expensive. I don't see any special benefit in them...
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piezo electricity and walking
