Please help !

Discussion in 'Embedded Systems and Microcontrollers' started by juhi1107, Oct 11, 2011.

  1. juhi1107

    Thread Starter New Member

    Oct 11, 2011
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    HI

    I am doing a project on dual axis solar tracker using PIC microcontroller ,ULN 2003 and 2 stepper motors


    and someone please post a circuit ?? and also as to how to proceed !?
    I have no idea about electronics !!!!!!
     
  2. nerdegutta

    Moderator

    Dec 15, 2009
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    juhi1107 likes this.
  3. t06afre

    AAC Fanatic!

    May 11, 2009
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    Sounds to me like this is a school project. And you do not know how to start. You are not the first nor the last person with such a request. First of all we will not just hand over a turn key ready solution. But we will be more than happy to discuss specific problems with you. Just remember good questions draw good answers. As a start divide your problems into several more or less isolated problems. And select which PIC you will use. Then select if you will be using assembler or C/BASIC.
     
    juhi1107 likes this.
  4. juhi1107

    Thread Starter New Member

    Oct 11, 2011
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    PIC16F877A is what I am going to use
    the first stage is designing the circuit. I am thinking of using MikroC . I need direction on how to start . Please help me with the circuit diagram . ASAP
     
  5. nerdegutta

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    Dec 15, 2009
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    What have you created/done so far? Why not start with a block diagram?
     
  6. juhi1107

    Thread Starter New Member

    Oct 11, 2011
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    yes I have made a block diagram ..how should I show that to you
     
  7. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    From the FAQ:

    Bertus
     
  8. juhi1107

    Thread Starter New Member

    Oct 11, 2011
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    this is the block diagram
     
  9. nerdegutta

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    Dec 15, 2009
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    In the link I gave in post #2, there might be a schematic you can use for one of the steppers. You need one for each steppermotor. Or maybe one ULN 2804A for both the steppers...?
     
  10. juhi1107

    Thread Starter New Member

    Oct 11, 2011
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    No I Plan to use two ULN2003 for 2 stepper motors.
    Thanx for the link.
    I do have a rough idea of how to use one ULN in the circuit but please help me with using 2.
     
  11. nerdegutta

    Moderator

    Dec 15, 2009
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    Could you use two of the schematics from the link in post #2?

    Perhaps side-by-side. Sharing the same powersupply. Connecting PIN 3 and 4 from one ULN2003 the PIC's RC0 and RC1. And from the other ULN2003 to the PICs RC2 and RC3...

    You even might need some transistors and resistors in between...

    Just thinking loud...
     
  12. MrChips

    Moderator

    Oct 2, 2009
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    juhi1107,
    A few tips you should know about forums:
    1. A title like "Please help!" is not very helpful. Learn to post a proper descriptive title.
    2. If you ask for a circuit diagram, you will not get one. Post one yourself first.
    3. If you want it ASAP, that means As Slow As I Please, i.e. in good time buddy, or do it yourself.
     
  13. John P

    AAC Fanatic!

    Oct 14, 2008
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    Seems kind of familiar:

    dual axis solar tracker project help prem25 The Projects Forum 4 03-29-2011 08:08 PM
    dual axis solar tracker (mppt) himanshu1990 The Projects Forum 11 08-31-2010 11:32 AM
    Help with solar tracker electronicsnewbie The Projects Forum 7 01-18-2010 02:48 PM
    need HELP on dual axis solar tracker kevinng The Projects Forum 07-18-2011, 03:56 PM

    And there are quite a few more. What's up with all this stuff? Hasn't anyone built it yet?
     
  14. tgotwalt1158

    Member

    Feb 28, 2011
    111
    18
    One idea may be of copying star tracker since function of both is the same i.e. telescope tracks the star and you are in need of tracking the sun. How this sounds to you? Any way try this one :
    http://mondo-technology.com/scharge.htm
     
    Last edited: Oct 12, 2011
  15. juhi1107

    Thread Starter New Member

    Oct 11, 2011
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    @nerdegutta - Thank you for that link - I had already read that. It was useful.
    I have made a circuit but I just need to know whether another stepper motor can be connected to it using another ULN and if it can be please help with the circuit.
    @Mrchips - Thank you for your insights. I am posting the circuit. :)
    @John P - I wonder :p
    @tgotwalt - I have started building it with other circuit components so no scope of copying - :O
     
  16. juhi1107

    Thread Starter New Member

    Oct 11, 2011
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    this is the circuit
     
  17. tgotwalt1158

    Member

    Feb 28, 2011
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    Ok then, but you will have to use ULN2803. I have sketched the diagram with the help of Win-Paint since I do not have other software. See the attached file. By the way, by copying, I meant copying the concept not the diagram!
     
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    Last edited: Oct 16, 2011
  18. juhi1107

    Thread Starter New Member

    Oct 11, 2011
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    Thank you tgot for your time :)
    why do you prefer ULN2804 ? and I wanted you to show me the connections of the two ULN with the PIC because I know the connections OF the two ULN2003 with the motors.
     
  19. juhi1107

    Thread Starter New Member

    Oct 11, 2011
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    also pleasse tell me how to program my PIC ? which is the best compiler in terms of taking the minimum time to learn ?
     
  20. tgotwalt1158

    Member

    Feb 28, 2011
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    Never mind, it was a breeze to me to draw the diagram in paint. As far as the selection of ULN2803 is concerned, just I liked this way. In your post 10 and 15 you requested the same i.e. how to connect two stepper motors with two ULN's, and now you got that. Any port with digital I/O supporting TTL buffer type, e.g. RD0~RD7 but you will have to configure those pins.
     
    Last edited: Oct 18, 2011
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