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Body Heat Powered Flashlight

Infinity Flashlight Powered by Your Own Body Heat

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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.

Summary

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!

About 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”.

Question / 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...

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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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  • 2 × Thermoelectric generator peltier size 40mm
  • 1 × volt boosting circuit from txl group https://customthermoelectric.com/elc-vb0410-1-unipolar-voltage-booster-40mv.html
  • 1 ×  Acrylic Sheet Covered on Aluminum pipe leaving aria of peltier 40mm local made Connectors and Accessories / Multiway Rack-and-Panel Connectors
  • 1 ×  Aluminum Rectangle pipe used for heat sink
  • 1 × 8mm 0.28W Strawhat White LED For best results. if you use 1 watt LED having good results but if having very smaller dot that bright in LED. Otherwise LED will not run.

  • Some Instruction For Better Results

    Wasim Sahu7 days ago 0 comments

    Thermal Paste

    For better results it more important to use thermal paste in between aluminium rectangle pipe and peltier. With this aluminium will keep the peltier at room temperature.

    Heat sink

    Your aluminium rectangle pipe should be like a heat sink. This will also keep the peltier at room temperature all the time.

    LED Selection

    If you have Strawhat 8mm 0.25W LED its ok. Actually I find 1W special LED has better results not every 1W LED. If you find this 1W LED then take other strawhat LED is ok. Every 1W LED has a yellow colour dot in its centre. Always take that 1W LED that has very small yellow colour dot. You can see in the picture yellow dot. The LEDs having mark are ok and having cross are not ok.  

  • Assembling the flashlight

    Wasim Sahu07/13/2018 at 18:40 0 comments

    First we need a rectangle aluminium pipe. 

    Then we need a acrylic sheet. That will cover the whole aluminium rectangle pipe only leaving the area of peltier which will touch the aluminium and will keep the peltier in a room temperature. 

    From back side of the light we also will cover it with acrylic sheet. From this we will make a whole like a (i) for air circulation. That will keep the aluminium and peltier inner side at room temperature. 

     These are the some pictures those will help how the flashlight is made. About LED strawhate 8mm 0.28W will work. In my own experience 1W special LED work very well. If you find this ok otherwise do not use 1W it does not use it. You can 8mm strawhat white LED 0.28W. More about LED selection few other things you can find in instructions 

  • Testing the Circuit

    Wasim Sahu07/12/2018 at 17:34 0 comments

    For testing our circuit it has 3 parts peltier module, volt boosting circuit and LED. 

    When we put our hand on Peltier. With the hand of our heat peltier module produce about 30mv to 40mv. Then volt boosting circuit take 30mv to 40mv from peltier and convert it into 2.5v and send it to LED. When LED receives 2.5V it starts running. 

  • Volt conversion 20mv to 2.5v or 5v

    Wasim Sahu07/12/2018 at 09:25 0 comments

    When I start creating flashlight. I took few Peltier’s their output volts were about 40mv. I tried my joul thief but failed many times they were not able to convert from 20mv or 40mv. There was a lot of search on internet any help about low volt conversion. After a lot of search internet I found two solutions about. Both were right for me. First was a IC that called LTC3108 available at analogy devices. Specially made for thermoelectric harvesting  devices like Peltier’s . That is available at many website like ebay.com or any that suite you. It has select able option about volts 2.5V, 3V, 3.7V, 4.5V or 5V. Here is method that you can make you own boosting circuit.

    Components that you need

    Fallow the pictures to make your own ultra low volts boosting circuit that start form 20mv  

    If you want to save your time about making it you can buy another circuit which also same efficient like LTC3108. Slim size as compare to LTC3108.

    Link is    https://customthermoelectric.com/elc-vb0410-1-unipolar-voltage-booster-40mv.html

  • Why am i creating this?

    Wasim Sahu07/11/2018 at 14:02 0 comments

    All human are equal. We born equal. But source of education is not equal for every one 

    I always think education is the right of every one. One some cases many people cannot reach on their goal because of electricity and light. I think with this project our people will have source of light. With this they can get education at night without worrying about batteries. Light sources that always remain in your hands with taking tension about battery are charring.  A headlamp that always remain on your head at study time. Sharing this project to hackaday community that anybody can build this. Without worrying about that they no knowledge about science.

  • Body Heat Powered Flashlight

    Wasim Sahu06/05/2018 at 19:02 0 comments

                                     Conceptual Block Diagram

    With Detail


    Bill of Materials for Infinity

     Name of materials    used in flashlight                                                             

    •  Thermoelectric generator peltier size 40mm         
    •  Unipolar Boost circuit convertor 
    • Aluminum Rectangle pipe used for heat sink

    Link    http://megaeshop.pk/tec1-12706-12v-6a-tec-thermoelectric-cooler-peltier-tec1-12706.html         

        Link     http://www.shop.customthermoelectric.com/ELC-VB0410-2-Bipolar-Boost-Converter-Circuit-ELC-VB0410-2.htm;jsessionid=F3561EC6FCA46551157931C1A71F520C.p3plqscsfapp001                                                                                            

    LED   8mm 0.28W Strawhat White LED   

                                                    http://projectpoint.in/index.php?route=product/product&product_id=500188647086

    • Acrylic Sheet Covered on Aluminum pipe leaving aria of peltier 40mm local made An Atrictive Sheet on Acrylic sheet leaving aria of peltier 40mm   local made

View all 6 project logs

  • 1
    ​ Thermal Paste

    For better results it more important to use thermal paste in between aluminium rectangle pipe and peltier. With this aluminium will keep the peltier at room temperature.

  • 2
    Heat sink

    Your aluminium rectangle pipe should be like a heat sink. This will also keep the peltier at room temperature all the time.

  • 3
    LED Selection

    If you have Strawhat 8mm 0.25W LED its ok. Actually I find 1W special LED has better results not every 1W LED. If you find this 1W LED then take other strawhat LED is ok. Every 1W LED has a yellow colour dot in its centre. Always take that 1W LED that has very small yellow colour dot. You can see in the picture yellow dot. The LEDs having mark are ok and having cross are not ok. 

View all 3 instructions

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Discussions

James Driver wrote 07/06/2018 at 16:00 point

I have heard many times that the human body looses most of it's heat from the head.  Why not make a elastic strapped unit that touches the forehead?  I imagine you could harvest more heat and you gain the convenience of having your hands free.

  Are you sure? yes | no

Wasim Sahu wrote 07/10/2018 at 19:10 point

Dear James Driver you are right i have tested this experiment. if we compare hand and forehead . forehead has batter resuls i also created for forehead. For this i used 4 peltiers and 4 led lights. soon i will upload this.

  Are you sure? yes | no

prosto wrote 07/05/2018 at 18:50 point

how many lumens this flashlight send?

is possible to add 2 panels?

  Are you sure? yes | no

manta103g wrote 06/22/2018 at 12:51 point

Thank you, great project.

"

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

"

Could you elaborate more on your DC/AC 100:1 step up ratio converter ?

I am trying to build such step-up DC > AC/DC converter to read  8A 0.5V input from a single solar cell and turn into some useful voltage output 5V or 12V.

If not successful I plan to build 0.5V 4W DC motor

Let me know your opinion

  Are you sure? yes | no

Wasim Sahu wrote 07/12/2018 at 11:40 point

First thanks to think me able for opinion. Some information about power conversion is uploaded in my Logs. Where you self can make volt booster 20mv to 5v. I cannot tell in comments with pictures.

These are some links I hope will help you

20mv to 5v
 https://www.ebay.com/itm/Thermal-Energy-Harvesting-power-supply-w-LTC3108-and-supercapacitor-storage-/331654685113

.7v to 5v   I self have this converter but I have shipping problem.

https://www.amazon.in/ASIANWORLD-1-5V-Voltage-Boost-Module/dp/B00ZA6URE8

here you self can make but  convert from .7v to 5v

http://www.instructables.com/id/Adjustable-Voltage-Step-up-07-55V-to-27-55V/

  Are you sure? yes | no

manta103g wrote 07/13/2018 at 00:32 point

excellent

since it's hard to find 8A 0.5V DC/DC > 5V step-up inverter

i plan to shift to concentrated PV to get higher voltage output

to boost efficiency

  Are you sure? yes | no

Rochesimpson wrote 06/16/2018 at 16:47 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?

  Are you sure? yes | no

Wasim Sahu wrote 07/09/2018 at 20:01 point

yes bro every thing is possible soon i will upload about it and more advance things. sorry all other bro i will replay one by one. key board not working.typing by mouse therefore. thanks for your love

  Are you sure? yes | no

Sam McLeod wrote 06/13/2018 at 09:47 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.

  Are you sure? yes | no

Wasim Sahu wrote 06/11/2018 at 17:04 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

  Are you sure? yes | no

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?

  Are you sure? yes | no

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. 

  Are you sure? yes | no

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!

  Are you sure? yes | no

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 . 

  Are you sure? yes | no

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

  Are you sure? yes | no

Wasim Sahu wrote 07/12/2018 at 12:03 point

Dear Roger 

Actually peltiers output is about 30mv DC. LEDs Direct from peltiers cannot work. LED works from 2v to DC 2.5v. In between of peltier and LED we need a volt boosting converter. Converter directly cannot boost volts from DC. In first it needs to convert in AC. Where small transformer boost the volts in 2.5v AC. LED need DC again converter convert it DC. Actually without AC we cannot boot volt. You know transformer works in AC. Therefore this boost converter is called DC to DC. This converter  Take DC 20mv and gives 2.5v DC use able for LED.

  Are you sure? yes | no

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