**Patent Pending - United States 61928067**


What is piezoelectric energy harvesting?
Piezoelectricity translates to “electricity from pressure.”  The prefix piezo in Greek means to press or squeeze.  Piezoelectric materials exhibit the piezoelectric effect.  This allows a mechanical force to be applied to the material to deform it slightly and the material will produce an output electric power.  This is done by rearranging the dipoles of the piezoelectric material.  This rearrangement causes a change in the dipole density and therefore a change in the electric field between the dipoles.  Because of this change in the electric field, the piezoelectric material produces an output electric power.

What will be accomplished in this Instructable?
Completion of this Instructable will result in a piezoelectric energy harvesting "boot."  With use of other electronic components, this unit will be able to power other small devices that have a low power consumption.  Total project cost (for 1 unit) is ~ $100.

Step 1: Decide what size the unit should be. Draft it in a CAD program, both in 2D and 3D.

When drafting, be sure to know the size of the piezoelectric disks that will be used.  Consider spring placement and sizes of springs.  The springs that were used in this unit were about 1.5cm in diameter.  Think ahead to all aspects of design from disk placement, spring placement, to where guide bolts will be placed and connecting bolts will be placed.  Also think about wire management.  The wires can sit next to the disks, but it doesn’t look neat and clean.  It will be helpful to see all of this digitally when it comes to assembling the unit.
<p>plz i want to download these project files to use them </p>
If you send me an email (ryantingley@ymail.com), I would be happy to send the files to you. Unfortunately, the files have expired on the website they were posted on.
Dear Ryan i've sent a message for you to get the project file (piezoelectric power harvest) to clarify important points in my similar project.<br>Thanks,
<p>Could you please send me project files to my mail:</p><p>ahmed.settyet@yahoo.com</p><p>Thanks in advance, appreciated.</p>
<p>please send me the project file to my mail.</p><p>kumbharchetan0505@gmail.com</p>
<p>could you send me the project files as well? thanks!</p><p>jman93624@yahoo.com</p>
<p>can you send me the project files? thanks a lot!</p><p>email address: angelateoz@gmail.com</p>
<p>Is there any chance of me getting to see the project files because all of the links have expired?.</p>
Absolutely! Send me an email and ryantingley@ymail.com and I would be happy to attach the files.
<p>Sir Please Send me Project file (umairlaghari826@gmail.com)</p>
<p>Thanks, email sent (kyledubber@gmail.com)</p>
<p>hiiii can u send me the files? plss? i need it for my research projecttt plss. send it at @denillll@yahoo.com thank you. God bless!</p>
<p>Hi! Your project is awesome! May I get a look at the project files? The links have expired. Do you mind emailing me the files? </p><p>alxxlalx@gmail.com</p>
<p>hey sir can you please send me design and research files to my mail.?</p><p>if you could do this so please send it my mail id is dhruv.b.parekh@gmail.com</p>
<p>Hello there. Salam from Malaysia. May i know, on your 12th steps page, there is a link for downloading this material for research and reference. may i know, is there an alternative link to download the folder? apparently, the link is too old and propably deleted. please help, thank you.</p>
<p>Where do you buy those piezo electric generators?</p>
One small point which occurs to me which could affect the efficiency. If you have connected the piezo units directly in parallel are you not losing power due to the output of one of unit driveing the other units if there is a difference in the phase of the voltage being created? Only if pressure was applied absolutely parallel to all devices would they all produce in phase. Or did this have little effect in practice?
kintekobo,<br><br>It is extremely likely that your hypothesis is correct. Pressure is not (though pretty good considering design constraints) applied absolutely parallel to all disks at the same time. Therefore, it is just about given that the devices are not in phase. This is likely a major part of the lack of efficiency of the unit. I believe that another major problem is the gauge of wire that was used to connect all of the disks in parallel. It is much larger in diameter than the wires coming off of the disks, which means that a lot of power is probably lost to resistance in the circuit. At the the time of testing the unit, I did not have the tools to measure whether the devices were in phase or not, so I cannot conclude that this is a definite issue, though as previously discussed, quite likely so. Given the lack of measurement tools, I concluded that power was lost mainly due to resistance. <br><br>Thank you for your ideas - they will be considered when making improvements to the device!<br><br>Ryan
How much electricity by one pizo is produced?
I cannot remember the current produced from one disk... I think it was about 30V and low milli- or high micro-amps. I have some data in my .PDF about the project. Unfortunately, I did not have enough time to take and record good data for this unit, though it was not required for the project anyway. I will try to gather some data in the near future as this is a common inquiry.
What was the final output? <br> <br>Did it actually work as a boot sole?
Please see above reply to rimar2000 for your first question. <br> <br>The device was indeed tested as a &quot;sole&quot; of a shoe. It was placed on the floor and stepped on to mimic walking. Velcro straps or some other means of attachment to the foot or shoe could be put on the unit to actually use it while walking. With an increased price and some design considerations to make the unit smaller, it could actually fit into the sole of a shoe AND have a larger output.
So, in it's current form, it's more useful as an energy-harvesting floor - put it under a panel in the floor of a corridor?
Yes, that would be a more plausible application of the existing unit. To operate as a &quot;shoe&quot; or shoe sole, the unit would have to be smaller. The large size of this unit reduces cost as well as exaggerates operation for comprehension of the concept of piezoelectric energy harvesting for the non-scientific minds.
This is a very useful project, but the main question is &iquest;is it useful? &iquest;How many Volts x Amps it brings?
This is a low power source. With a good strike, each disk produces about 25 volts. I do not have my research papers with me at this time and do not recall amperage, though it is in the range of single-digit mA or high uA...In other words, very low current. Many disks together can provide enough power to light a hallway. You may find the file on page 12 entitled &quot;JR-EAST.pdf&quot; to be helpful in answering this question.
No video? You should make a video.

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