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Vertical axis solar tracker help please urgent

Discussion in 'Renewable Energy' started by Fan9, Dec 18, 2012.

  1. Fan9

    Fan9 New Member

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    Hi, i need urgent help and reply.

    I have a NE 555 timer , L297, L298 and stepper motor

    i wan to combine them together to build a solar tracker just 1 axis (Vertical up and down direction.)

    Problem is i dont know how to combine them together.
    I trying look at the data sheet on the web and combine l297 and l298 (without the diodes) and clock to ne555 timer (monostable) but the stepper motor cannot move! checked my NE 555 with LED is working. If got sch to show mi connection will be good or advice please!
     
  2. MikeMl

    MikeMl Well-Known Member Most Helpful Member

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    If it is truely a "vertical axis tracker", you must live at the equator ;)
     
  3. alec_t

    alec_t Well-Known Member Most Helpful Member

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    If you didn't use the diodes you may have fried one or both ICs. The diodes are essential to suppress back-emf spikes.
     
  4. dave

    Dave New Member

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  5. Mr RB

    Mr RB Well-Known Member

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    You mean at the North pole? ;)
     
  6. 4pyros

    4pyros Well-Known Member Most Helpful Member

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    Now may I ask why this is "urgent"?

    You must hook up the L297 and L298 as shown in the data sheets.

    Do you have a drawing of what you have so far?
     
  7. Fan9

    Fan9 New Member

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    I going FYP and my lecturer forsaken us and due date in some days! I follow the datasheet for bread boarding but it doesn't work
     
  8. 4pyros

    4pyros Well-Known Member Most Helpful Member

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    So this is for school and you dont know what to.:confused:
    You said you tryed it without the diodes.
    As said befor you need the diodes and may have damaged the driver chip.
    Do you have another L298?
     
    Last edited: Dec 23, 2012
  9. Fan9

    Fan9 New Member

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    Yea, the lecturer dump mi the datasheet and 2 of the l298 and ask mi connect the circuits without diodes! He said that I don't need control the speed of the motor so don't need to connect diodes 2A!
     
  10. 4pyros

    4pyros Well-Known Member Most Helpful Member

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    Even without speed control you are still turning the coils of the stepper on and off just to get it to move.
    You need the diodes.
     
  11. Fan9

    Fan9 New Member

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    Ok I will try it! 36v apply at 4, really need so much voltage? And can I connect the clock with a 555 timer? If can which mode is better?
     
  12. alec_t

    alec_t Well-Known Member Most Helpful Member

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    It depends on the rating of your stepper motor. Try with a much lower voltage to start with, or you may fry the motor too!
     

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