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Thread: Science Project for Dillon

  1. #1
    Administrator OMFG I Post Too Much
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    Default Science Project for Dillon

    So dillon a few weeks back comes home from school and says he has to do a science project. i go What do you want to do, he goes

    Solar Powered Battery Charger...i went ok...and did some research -one of the links came up, USB solar powered ipod charger...i went

    Dillon how about making a Solar Powered USB charger that can also do IPOD's OR batteries...

    130 dollars later.
    1 - 10w 17.5v solar panel
    1- multimeter to dbl check the voltages
    1 1n4001 blocking diode (to stop the power from ruining the solar panel)
    1 adjustable voltage chip
    1 220 ohm resistor
    1 680 ohm resistor
    1 unused external hard drive case
    3 usb cables - one with female hookup
    1 circuit "card" to hold all the chips for soldering
    1 soldering kit
    1 red led (LIGHT WE HAVE LIGHT!)
    1 cut finger(sliced with a knife while cutting a wire)
    1 burnt finger- soldering iron naturally

    and today we have successfully tested a 5volt (dc) powered usb charger.(it was done a few days ago but it's been raining so no sun to try it with)

    i did the circuit from this diagram:



    the Led light goes from the solder from the resisistor 1 (220 ohm) then the neg is at the junction of resistor 2 and the negative wire.
    and it also will do batteries if you splice in a usb cable to a battery holder pack
    Attached Images Attached Images
    Lenardo

    Look up You May See Stars Tonite

    Lynch Park



  2. #2
    Ascendant Transcendent
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    Pretty cool. I imagine you could use a breadboard for this for a 'solderless' solution. I see about 20 bucks of mats here, apart from the solar panel. What was the cost breakdown?

  3. #3
    Administrator OMFG I Post Too Much
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    I went overboard on the solarpanel

    40 dollars for that
    2.50 dollars for the voltage regulator
    1.50 each for blocking diode, and resistors(overpriced you can get a kit of 100 resistors for 7 bucks)
    4 bucks for the circuit board (which you can skip entirely and just solder the stuff together)
    2 dollars - red led
    8dollars -soldering iron kit
    25 dollars multimeter(did not have one)
    2 dollars for the quick connects.
    2 dollars for electrical tape
    3-7 dollars for a cable with a usb female plug on it- cut in half with the wires exposed on the female side- should be 4 wires, red black green white...cut off the green and white you do not need them for this, they are the data wires(usually). save other end of cable and make a usb powered rechargable AAA battery pack (connect red to red, black to black on a battery holder pack..insert rechargable batteries of appropriate type, provided the voltage is higher on the panel side vs battery pack it will charge when plugged into the female plug.
    3 dollars red and black wire ~2- 1' in length pieces each

    directions w/o any board:
    solder quick connects to solar panel -alternating quick connector type so there is only one way to plug in the wires
    solder quick connects to red and black wire - matching positive female connect to postive male connect.
    other end of red wire- solder on blocking diode line on bottom (1n4001 diode) solder end of blocking diode to voltage in on voltage regulator
    solder 220 ohm resisitor onto middle voltage adjusting end of voltage regulator, solder short piece red wire -BEFORE the resistor solder other end red wire to + wire on usb plug
    solder 680 ohm resistor onto end of 220 ohm resistor - solder small black wire @ joint between 220 and 600 resistors
    and connect other end to voltage out of voltage regulator
    solder small black wire to - wire on usb plug, solder other end wire + the original black wire that one end has the quick connect on to empty end of 680 ohm regulator

    figure out which wire on red led is + and which is -... connect + to a red wire, connect - to a black wire via soldering

    plug in usb ipod cable to ipod, plug male usb end into female usb plug - connect the wires to solar panel correctly, place solar panel in light....

    it should charge.
    Lenardo

    Look up You May See Stars Tonite

    Lynch Park



  4. #4
    Ascendant Ashenhand
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    How long for a full charge from close to 0% to 100% given average sunlight? We talking 3 hours? 8 hours? More hours than daylight in a day?

  5. #5
    Administrator OMFG I Post Too Much
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    about 3-4 hrs from dead to full charge

    i tested the unit on my phone, nook tablet and my nook.

    they ALL charged, if an item will charge over usb on a computer, this unit will charge via solar.
    Lenardo

    Look up You May See Stars Tonite

    Lynch Park



  6. #6
    Administrator OMFG I Post Too Much
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    oh ya, dillon got honorable mention
    Lenardo

    Look up You May See Stars Tonite

    Lynch Park



  7. #7
    Ascendant Ashenhand
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    What took 1st place over free energy?

  8. #8
    Iksar Admin OMFG I Post Too Much Nedrom's Avatar
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    This is some cool shit!

    When I went to the science fare as a kid I reproduced the NASA launch pad and shuttle from styrofoam lol it was fun!


  9. #9
    Enlightened Grandmaster
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    I thought the standard project was a volcano.

  10. #10
    Administrator OMFG I Post Too Much
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    the "theme" of the fair was "green/alternative energy"

    so the winner was solar powered water generation from sea water or somehting like that.
    Lenardo

    Look up You May See Stars Tonite

    Lynch Park



  11. #11
    Iksar Admin OMFG I Post Too Much Nedrom's Avatar
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    That's pretty high tech man

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