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This Thermal Electric USB charger allows you to plug in, charge and use your device! It contains 4 - Thermal Electric modules that charge up 4 NI-MH backup batteries for the purpose of charging your phone.

Step 1: MATERIALS

Tools

Wire Strippers
Soldering Iron
Drill
Flush Cutters
Heat Gun
Pliers
Etchent
Computer
NI UltiBoard
Nails/Braid Nailer
Wood Saw
Hack Saw
Grinder
Sand Paper
Metal File
Electrical Tape
Super Glue

The Charging Station

• PCB

• Maxim DS2715 IC and surrounding circuitry - DS2715 Data Sheet

• 4 - Duracell NIMH batteries (Duracell 2400mAh - Rechargeable backup)

• On/Off – Single Pole Toggle Switch

• Three position switch - T.E.G/OFF/BATT

• Momentary Push Button – Current Measurement

• LED (Charging/Fault indicator)

• 2 – Molex connectors: 4-pin female & 2-pin female

• OKW Plastic Enclosure - Link is here: Free Sample Link

The Monitoring Station

• 20x4 - SainSmart LCD - Link is here: Amazon Link

• 4 - AA’s battery backup

• Three position switch - T.E.G/OFF/BATT

• Arduino Uno Microprocessor - Arduino Site

• Resistor Dividers (Limits the current and Voltage for Safe Measurements)

• AD623 - Instrumentation Amplifier and surrounding Circuitry - AD623 Data sheet

• 2 – USB Charging Ports (from car charger)

• Wood (luan)

• 2 – Metal Hinges

The Oven

• 4 – Vktech TEC1-12706 Thermoelectric Coolers/Generators - Link is here: Amazon Link

• Arctic Silver 5 Thermal Compound 3.5 Grams - Link is here: Amazon Link

• Cooking Pot

• Heat shrink and radiant heat tape - Link is here: Amazon Link - Heat Tape

• Scrap metal for oven fabrication

• 3/8” Threaded rod and hardware

• 1/4” Bolts and hardware

• 5/16” Tech Screws (Self-Tapping Screws)

• Steel Leader (fishing leader)

Step 2: The Generating Pot

The Cooking Pot contains the 4 - T.E.G modules sandwiched between the heat sink. Thermal Compound is added to both sides, this allows heat to transfer easily, preventing the modules from overheating. The modules are then shrink warped together and soldered in series. To attach the heat sink to the pot, steel fishing leader is wrapped around the pot in between the fins of the heat sink. One both sides it is then screwed into the metal pot using metal screws. Once secure, use a metal file or grinder to trim excess screw and seal it with super glue. The Thermistor is added into the heat sink to act as a thermometer and will give me an accurate reading of the temperature. The Thermistor is in set up in a voltage divider configuration that is fed into the Arduino.

Step 3: The Charging Station

The Charging Station Consists of 4 NI-MH batteries, charge controller circuit, all in a OKW plastic enclosure. The Charge Controller Circuit consists of a DS2715 Maxim IC and its surrounding components. The datasheet is provided in this link Maxim DS2715 Data Sheet, I used the typical Linear application circuit by Maxim and added/tweaked the circuit to accommodate my needs. I used Voltage Dividers to allow me to make measurements on the circuit to lower the voltage and current going into the Arduino.

The NI Ultiboard PCB Layout
↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓

Step 4: The Monitoring Station

This Station Can measure the Voltage, Current, Power and Temperature of the Generator. It does this by using the Analog inputs of the Arduino. Resistor Divider circuits are needed to prevent damage to the Arduino.

Step 5: The Oven

This Shows the Assembly of the Oven in Steps, but unfortunately I didn't take photos of the actual construction.

Step 6: The Code

This is the code for the Arduino UNO it can be editied or downloaded from the Arduino IDE.

The link is here: Arduino IDE

Step 7: The PowerPoint

This is the PowerPoint that I used to present my Senior Project at my college.

Step 8: The Video

<p>cool project.</p><p>but if you burn something your are not green!... because you generate CO2. (unless is hydrogen H2). </p>
You do not have to burn something to generate the heat. I was able to use melting snow and sun shine with mine. <br><br>A friend and I built this very efficient Thermoelectric Generator for $7.50.<br>It can generate power from a temperature gradient of 5 degrees celsius or greater and can withstand up to 300 degrees celsius before shutting down.<br><br>http://instructables.com/id/Recycled-Energy-ThermoElectric-Generator/<br><br><br> Please vote for our entry in the instructables contests!<br><br>Have a great day!
<p>awesome project.</p><p>i want to know schematic for the monitoring station, can you share for me? please email: febriansahsetiawan@gmail.com</p><p>thanks</p>
A friend and I built this very efficient Thermoelectric Generator for $7.50.<br>It can generate power from a temperature gradient of 5 degrees celsius or greater and can withstand up to 300 degrees celsius before shutting down.<br><br>http://instructables.com/id/Recycled-Energy-ThermoElectric-Generator/<br><br><br> Please vote for our entry in the instructables contests!<br><br>Have a great day!
<p>really good idea, reminds me of the RTGs they use on deep space probes like cassini and voyager. with some careful arrangement this could be set up so during the day it heats a liquid with a high specific heat capacity then drains the energy from it at night. </p>
<p>very good perfect ;)</p>
<p>Thank you!</p>
<p>very cool!</p>
<p>Thank you! I realize some things may be a little vague. This is because I made this after I finished my Senior Project. Let me know if you have any qeustons.</p><p>-Ryan</p>

About This Instructable

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Bio: I live in New England and currently have two degrees, one in Electronic Engineering and the other in Electrical Technology. I love building and tinkering ... More »
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