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Infinity Flashlight Powered by Your Own Body Heat

Body Heat Powered Flashlight

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Short Project Description

My objective in my project was to create a flashlight that runs solely on the heat of the human hand. Using two Peltier tiles and the temperature difference between the palm of the hand and ambient air, I designed a flashlight that provides bright light without batteries or moving parts. My design is ergonomic, thermodynamically efficient, and only needs a five degree temperature difference to work and produce up to 5.4 mW at 5 foot candles of brightness.

I chose to investigate the aspect of human energy when I found out that we are like walking 100 Watt light bulbs. The goal of my project became a flashlight powered solely from the heat of the human hand. I decided to use Peltier tiles. If one side of these tiles is heated, and the other is cooled, electricity is produced. For my flashlight, I would be heating one side with the palm, and cooling the other side of the tile with a heat sink.

Short Project Description

My objective in my project was to create a flashlight that runs solely on the heat of the human hand. Using two Peltier tiles and the temperature difference between the palm of the hand and ambient air, I designed a flashlight that provides bright light without batteries or moving parts. My design is ergonomic, thermodynamically efficient, and only needs a five degree temperature difference to work and produce up to 5.4 mW at 5 foot candles of brightness.

2Summary

I chose to investigate the aspect of human energy when I found out that we are like walking 100 Watt light bulbs. The goal of my project became a flashlight powered solely from the heat of the human hand. I decided to use Peltier tiles. If one side of these tiles is heated, and the other is cooled, electricity is produced. For my flashlight, I would be heating one side with the palm, and cooling the other side of the tile with a heat sink.

I calculated that our bodies radiate 5.7 mW/cm2, but only 0.5 mW is needed to generate a bright light at the LED. I characterized both Peltier devices. Both produced power, but only a few millivolts. I need 2.5 V !  I had to convert my DC input to AC, and then run it through a oscillator circuit with a stepuptransformer. My final circuit had only 3 parts and produced a step up ratio of 100:1. So for 50 mV DC from the Peltiers I obtained 5 Volts AC which was sufficient to light the LED. The final design included mounting the Peltiers on a hollow aluminum Rectangle tube and acrylic sheet was wrapped on hollow aluminum rectangle sheet leaving aria ofpeltier that allowed ambient air to cool the tube. The palm wrapped around the peltier to warmed thepeltier tiles. The result was a bright light at 5 degree Celcius of Peltier differential. The flashlight worked!

3About Me

Hello, my name is Muhammad Wasim. I live in Pakistan. I am 23 years old.  I have a great love for science, and have been competed many project about power generation and energy saving. A full size of ceiling fan 56” powered by cell phone battery. Cell phone battery charging system through walking for shoes with piezoelectric. Hydrogen fuel cell and hydrogen production from water with cheap way and running a bike through hydrogen. Cell phone charging system through radio signals coming from cell towers. I also submitted  propeller design which is able reduce 70% noise and about 30 save energy to DJI drone company about a year ago with no replay. Now DJI is using these propellers in mavicpro platinum. This time I am going with the project; The Infinity Flashlight.

My next projects are power generating football 2 a bike helmet having personal air conditioning and heating system on demand. Creating water from air. Creating a energy harvester on mass base like Nikola Tesla.

My family has encouraged my interest in the sciences, and my first toy was a box of transistors. Nikola Tesla and Edison have both inspired me greatly as role models.

To be honest, I am not sure exactly what I want to study in the future just yet; I'm thinking it will probably be the Sciences.   My passion is “Serve the humanity through advance science”.

4Question / Proposal

Hypothesis: If I can capture enough heat from a human hand and convert it efficiently to electricity, then I can power a flashlight without any batteries or kinetic energy.

Objective: To make a flashlight that runs on the heat of the human hand.   

5Research

I couldn't find any idea specific to my topic of the thermoelectric flashlight at all, except for a website called the Joule Thief. The website was dedicated to low voltage transistor oscillator circuits. I also found one other source that really made me believe that my battery-free flashlight was indeed possible when surfing the internet and found a paper entitled "Ultralow Voltage Energy Harvester Uses Thermoelectric...

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Short Project Description.docx

Description about project

document - 16.29 kB - 06/05/2018 at 18:19

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infinty flashlight (1).docx

components used in flashlight

document - 517.64 kB - 06/05/2018 at 18:15

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Discussions

Rochesimpson wrote a day ago point

interesting project and well documented. Could you improve the thermal pickup of the peltier tiles if they were curved to fit the palm better?  Can you bend them?  I was thinking this idea might be incorporated into a conventional flashlight shaped device. 

Are there higher efficiency leds or are they all about the same?

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Sam McLeod wrote 5 days ago point

This would be very handy to leave just inside your garage or shed door, also I could see it being useful left in the boot of your car, there’s a lot of value in not having to remember to keep it charged or batteries on hand.

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wasimsahu wrote 6 days ago point

First  all members heartily thank you very much to like the project. the circuit called ultra low volt booster dc to dc. it can convert 20mv to 2.5v . First this circuit takes dc power from peltier then convert it to ac so ac is boosted then again it convert the ac boosted to dc then you can used it for led or any thing that is  low power you like to operate. for best results you use thermal past between aluminum heat sink and peltier. Good heat sink gives  more best result. The product is also arrow electronic certified these are some links about the light.

https://www.indiegogo.com/projects/a-flashlight-powered-by-your-own-body-heat#/

http://wasimtech.com

https://www.youtube.com/watch?v=Dqd43YdkXwc

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Ryan H. wrote 06/08/2018 at 18:26 point

This is super cool! 

Just out of curiosity, what is the response time from holding it to full brightness? Does it take a little bit before the pelt warms up to light up, or is it pretty much instant?

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GH wrote 06/08/2018 at 00:29 point

This is an awesome idea - nice project! It's made me wonder if I could make something similar with a  homemade Joule-thief like booster circuit since I already have a peltier tile. 

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Matei P. G. wrote 06/07/2018 at 21:58 point

Awesome project! Also a good lawyer can get some money from those assholes stealing your design. Never submit full plans, just videos with the working thing. Learned this the hard way, like you!

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Roger wrote 06/07/2018 at 03:47 point

Hi - I love this idea. Why does the input need to be AC? I thought LEDS were DC . 

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George Albercook wrote 06/08/2018 at 17:59 point

You are correct. The LED does need DC. Since the voltage from the peltier is too low to light the LED he had to step it up. The circuit that does that is an AC circuit. Once it converts the low voltage DC from the peltier to AC it can use a transformer to step the voltage up then rectify it back to DC. 

In general this type of circuit is call a DC- to - DC converter 

Note that when the transformer steps the voltage up it also steps the current down. No magic here.

Overall there is some loss. In the data sheet for the DC-DC converter that he used 

https://customthermoelectric.com/media/wysiwyg/Electronics_files/VB_Data_Sheet_A1109.pdf

there is an example calculation showing only 63% efficiency.

Hope that helps

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