would u please help me in my sun tracker project

Discussion in 'General Electronics Chat' started by zeeba, Sep 26, 2010.

  1. zeeba

    Thread Starter New Member

    Sep 26, 2010
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    would u plese help me in my sun tracker project
    hi

    application:

    1-I want some suggestions for simple applications to my suntracker project.

    basecally the solar pannel will track the sun and save the power in some battries and use it to supply another load.

    what would that load be ? I want something in life that the sun tracker would be usefull to use with.
    like some thing in desert or sea .

    about sensors

    2- what is the defference between the LDR, photoresister and the photo cell ?
    which one is better to use it as a sensor?

    3-If I put 2 LDR s as sensors on a solar pannel and compare the two reading in order to track the sun. do you think that would work ?is it accurate?


    thats all 4 now thanQ
     
  2. marshallf3

    Well-Known Member

    Jul 26, 2010
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  3. tom66

    Senior Member

    May 9, 2009
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    You can track the sun using relatively simple math. Given the current time and date, and your longitude and latitude on the Earth you can predict sunset, sunrise and the approximate position of the sun in the sky.

    A load? Well, think about things that could be useful: charging a laptop, or phone, for example. Recharging a dead car battery. Perhaps even try running something more powerful like a portable television.
     
  4. bertus

    Administrator

    Apr 5, 2008
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  5. zeeba

    Thread Starter New Member

    Sep 26, 2010
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    thank u guys for ur help but no one answered my questions about sensors
     
  6. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    A LDR (a LDR is mostly made of CDS) and a CDS are basicaly the same.
    A photocell can be in two ways.
    1) like a LDR (photoresistor) or
    2) a photoelectric cell, that gives a voltage when lighted.

    Here is a page from the EDUCYPEDIA on optical sensors:
    http://www.educypedia.be/electronics/sensorsoptical.htm

    Bertus
     
  7. zeeba

    Thread Starter New Member

    Sep 26, 2010
    22
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    right now I am using 2 LDRs
    but my friend adviced me to use solar cells as sensors instaide of the LDR.
    he said that you can't find 2 LDRs give the same voltage if you tested them under same conditions so if you use them, your system will not operate correct because LDR have nonlinearity errors. what do you think ?? Is he right?
     
  8. bertus

    Administrator

    Apr 5, 2008
    15,645
    2,344
    Hello,

    On the page I gave you there is this schematic:
    http://cdselectronics.com/Kits/SolarTracker.htm

    You can see there are two potmeters on the board.
    One for setting the balance (100 K), if the LDR's are not quite the same and
    One for setting the sesitivity (20K), so the motor does not move constant.

    Bertus
     
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