Electricity Generating Footwear - Generate Electricity By Walking (Concept)

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Did you know that you can produce electricity by just walking? Here's a little science experiment that will show you a little secret on making insoles that can charge USB devices! The challenge is to make a slip-on insole that can produce enough electricity to charge batteries/ USB devices.

Google Fair 2014:
This is my entry for Google's 2014 science fair. Please support us by hitting the like and share button on our YouTube video. The contest is YouTube based so getting a fair amount of likes and viewers would help a lot in getting us through the competition.

Thank you guys for the support! The project has qualified for the regional finalist and won a local award in GSF 2014! :D

Development of The Project:
The power generating soles are one of my first concept projects. I started my first prototype last five years ago although it was a very primitive, compared to my current design. My old prototype had two TO-3 plastic spacer sandwiched between two piezo discs. It produces a fair amount of current, enough to charge a Nokia 3310.

5 years later, I came back with the idea of using the sandwiched piezo setup, this time integrated to a charge collector and powerbank. So I thought, why not add 2 more pairs? After all, more is better.

Concept Behind The Project:
Piezoelectricity was present ever since mid-18th century. Piezoelectricity is the electric charge that accumulates in certain solid materials (such as crystals, certain ceramics in response to applied mechanical stress. This sounds familiar! Yes they do, you can actually find those piezo elements in your old/ outdated earphones from the 90's.

Why Not Use Dynamos?
As much as possible, I tried to avoid using dynamos. Yes dynamos produce more electricity but it will feel like you've stuffed a rock in your shoe. Don't forget dynamos will create a lot of noise.

Any Practical Uses?
As funny as it sounds, charging a phone with your shoe isn't really joke. Who knows maybe someday shoe companies like Nike could use these insole generators to power fitness chips (inside shoes) that would sync to your phone wirelessly. This way, you don't have to charge your smart-shoes just to sync them with your phone.

Disclaimer: This is just a little science experiment. It will show you the concept of producing electricity using piezoelectric elements. Don't assume that is close in becoming a product.

GMA News Network/ Channel Coverage:

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I'm curious, since one side is somewhat elevated, how did you feel after the two hours? Any back pain or stress in the ball of the foot? Does it feel more spring like?

I certainly like the concept, piezos are definitely difficult to make work.

ASCAS (author)  efahrenholz1 year ago

Surprisingly, it feel comfortable. The foams are squishy enough to make the insole feel like a gel slip-on. When jogging a 10-20% energy loss is expected due to the gaps of energy production. Jogging for at least for 3-4 hours should charge the battery full. A walk should take 5-6 hours to charge a 400mAh full, due to the 40% energy loss.

Don't forget that these peizo elements produce more energy when jumping. The weight of the user/ subject also affects the amount of energy produced. The heavier the subject, the higher the current.

Congrats for your prize in GSF 2014. I am also thinking of a project associated with piezoelectricity. But I don't know which piezoelectric transducers to use. I found the one in the link on internet, is it good?


ASCAS (author)  ASCAS1 year ago


priandoyo3 months ago

Thank you for sharing, it is inspiring project



Thanks Kuya Angelo now we can work in our investigatory project ..... ( Your older than me ) . Thanks !

T0BY1 month ago
yasmi praba1 month ago

when we took one step,how many voltage does it charge?

kingkaushal1 month ago
is this really work or not??? please tell friends!!!!!

Can you explain me how it can charge a powerbank after walking for 5-6 hours where it generates only 0.093 joule per steps while walking?

The powerbank you mentioned needs 7200 joule to charge fully

From where can I get piezo discs and what is the diameter taken...?
I need it plzzz...!
Primian2 months ago

Hi, only one question: have you done a brevet?

grupoinstruc3 months ago

I am trying to reproduce it using 12 transducers , but i am only generating 100 microA .

i soldered then in paralell

rajsingh23 months ago

can you send the parrellel circuit on rajsingh7892@gmail.com plz

rajsingh23 months ago

mine is not produsing 1v also ipeizo disks are cutting there current can you plz hip me plz

Congrats for your prize in GSF 2014. I am also thinking of a project associated with piezoelectricity. But I don't know which piezoelectric transducers to use. I found the one in the link on internet, is it good?


YogeshD33 months ago

what is foam ? please reply

AndreasO13 months ago

A regulator eat to much power, and the Powerpack will not Charge, because of the voltage break. I think also the direct contact bring milli seconds to charge. ( My powerpack is blink a little bit. ) the concept is great but the Efficiency is to low.

Have anybody a regulated system?

AndreasO13 months ago

It works and generate with my 20mm piezos 6 of it ca. 5-6Volts. I will put a regulator behind (µa78s05) and try to charge my 1000mAh powerpack in a run. Thanks for the great idea.

AndreasO13 months ago
dengd4 months ago

is there a specific Piezoelectric Transducers you used... there is various online or does it not matter?

kennard20004 months ago

hi im also a filipino (the one who believes you) can you tell me where did you buy the piezo

mayur satani4 months ago

which parts are used in this project(name of parts) and how much cost of this all parts?

send me on : mayursatani7@gmail.com

pls send me, thnx...

karan.virk.315 months ago

can u please tell me how to get better current rating to charge up my phone . I am only getting 2.40 v after my regulator which is not 7805 plz tell me brother how to get 3.7 v to charge up my phone

davy.thibau5 months ago

we made it but we could get only 0.5mA out of the piezo elements, this is not enough to charge a battery. Did we do something wrong? how dig you get 5mA out of your piezo's?

IshanP6 months ago

Yes, they will work, in fact, those are what I am using. Keep in mind that twenty mm is really small, so it might be hard to work with!

Hey, Angelo, I need help with the testing part, I want to test how much electricity is generated by only one piezo disc. Do I still need the Mylar capacitor? And how do I connect the piezo disc to the Mylar capacitor then to the digital multimeter?

If you need to send me an Email, then send it to:


Javier Corado5 months ago

I think that someway that would work even better is to plug every piezo in parallel just like you did and then connect it to a 1000mF 50v capacitor then into a voltage regulator and then just add some more capacitors only to regulate the voltage, and i think that if you put a switch you may charge a cell phone directly from the circuit, because the voltage will be already regulated and control, or if you want to avoid to a fail in a circuit plug it into the powerbank

Carlos321fm made it!6 months ago
I create it and not work

Maybe take away some of the piezo disks, see if that works!

Carlos321fm6 months ago
Angelo, i need contact you, my email is carlos321fm@gmail.com
Carlos321fm6 months ago
Angelo, i need help, i create one of it and not work

Wow! I'm going to do this for a science fair coming up, is that ok?

Amazing idea, hope it becomes reality and people do buy it!

I am connected to various foundation to help new ideas become reality email me carlostobillo@gmail.com
pots11266 months ago

i'm curious that a piezoelectric disc could only produce a micro current.. can this factors can charge a power bank or any rechargeable battery efficiently?

awesome device, can't wait to wear it :D

hi. i'm a student. I just want to ask how many bridge diodes are needed, is it two or only one for both side of the insole?

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