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  1. #21
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    irf640 stepping motor

    Hi all,
    I,ve built this nice circuit found in Silicon Chip magazine to test my bipolar stepper motor collections. Easy to built and works perfectly.



    •   Alt16th November 2006, 03:00

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  2. #22
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    pin detail of uln2003 chip

    Sorry, its for Unipolar stepper motor actually...still using it till now.



  3. #23
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    uln2803 bipolar stepper pic16f690

    I have a good and bad news

    It works but it cost my THREE microcontroller chip AT89C52 as I have tried to upload the code but it wouldn't let me because of Pin 9 problem after running with an unipolar stepper motor. However both still work but they cannot be reprogrammed anymore.

    The stepper motor get very warm and how can i prevent it getting too hot?

    Look forward to hear your suggestion

    Thank you

    MM



  4. #24
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    uln2003 buffer .pdf

    Should I use zener diode to protect my microcontroller chip? Anymore?

    MM

    Added after 1 hours 39 minutes:

    I suspect that stepper motor was drawing high current which cause damage on my AT89C51 chip. Does anyone agree with me?

    MM



  5. #25
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    use of uln2003 without microcontroler

    If you wired everything correctly, then there should not have been any problems. The ULN2003 cannot damage the micro, it simply has 2 transistors inside (per channel).
    I suppose that if the ULN2003 failed in such a way as to short the inputs to one of the outputs, then it could have damaged the micro.
    But you do not need any Zener diode on the micro.



  6. #26
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    stepper motor controller buffer driver ic uln2003

    Hi,
    Here is ur solution. Connect the motor as shown in schematic. No Doubts it will work and no issue. If any issues let me know.
    Thanks


    1 members found this post helpful.

  7. #27
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    jameco uln2003

    I have finally made it work without any problem.

    Now I have tried to use a similar unipolar stepper motor such as 30BYJ02AH which can operates at 12V and its resistance is 200 Ohm.

    Here is a datasheet link:

    http://www.silmanet.com/en/catalogue...roduct_id=4971

    I did exactly the same connection and gave it a run such as following the similar sequence as shown below:

    To my surprise, it doesn't move at all but could only feel it clicking. I have tried second stepper motor and i got the same result. Does it means they are damaged?

    MM

    Gear Ratio : 25-1 - ???



  8. #28
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    stepper motor uln2003a

    Hello,
    Try Data in these patterns also

    Pattern 1:
    1000
    0001
    0100
    0010

    Pattern 2:

    1000
    0001
    0010
    0100

    Pattern 3:

    1000
    0100
    0001
    0010

    Pattern 4:

    1000
    0010
    0001
    0100

    If all these r not working then OUT data as 0000 and try to turn the motor with ur fingers, Let me know the result.
    Thanks


    1 members found this post helpful.

  9. #29
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    stepper moter interfacing with uln2003,pdf

    Greeting guys

    I have forgotten to inform you that I got them working as I swapped the wires. The data sheet seems to be incorrect. I was over the moon. My next challenge is to control the stepper motor with precision angle. Does anyone know anything about it? Is anywhere in this forum or outside will help me to have preicison control with my motor?

    I am puzzled with my sequence such as 1000, 0100 0010, 0001 because I expect it to complete one revolution but my stepper motor (30BYJ02AH) turn ages to complete one revolution. I admit I don't know anything about gear ratio (75 - 1) so i presume it is one of the reason that it moves slowly. Please correct me if I am mistaken.

    Thank you for input so far

    MM



  10. #30
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    chip uln2003

    hi
    this my project "stepper motor control"
    thanks



  11. #31
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    uln2003 connection for interfacing,pdf

    Suggestion to all , it is better to use the uln2804 in place of 2003 and make a pair of two for better result in terms of current and etc.



    •   Alt21st November 2006, 14:41

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  12. #32
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    uln2003,bipolar stepper motor

    Indeed, I have already placed ULN2803 instead of ULN2003 in order to control two stepper motors. It works well but I need to control with high precision. Any tutorials on that stuff?

    Look forward to hear from you asap

    MM



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    uln2003 + l298

    What do you mean with "high precision"?



  14. #34
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    uln2003 ile bipolar motor

    Let say I want to move the stepper motor at approximately 30, 45, 90, 180 degree.

    This kind of stuff I need to know how to do it

    Thank you


    MM



  15. #35
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    source code uln2003

    You need to know how many steps are required for a 360° turn with your motor

    For example there are motor with 100 steps or 200 steps for 360° or other values

    Then you can calculate the steps required for your application



  16. #36
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    uln2003 characteristics

    hi

    i am sending the circuit diagram MOSFET based u can drive heavy stepper




  17. #37
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    internal diagram of uln2003 current buffer

    Quote Originally Posted by roykyn
    it all depends on the current drawn by the motor ..... it its high......ic will get damaged....better use transistors in darlington mode or evem mosfets like irf640,540, or tip144



  18. #38
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    8051 uln2003

    Frnds why exactly 7 darlington pairs are used in ULN2003?and wat about the configuration?



  19. #39
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    uln2003 step schematic

    yes is correct



  20. #40
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    uln2003 using bipolar stepper motor

    Hello, i have taken out small DC motor out of toy, it looks like this one:


    problem is i dont know its characteristics? how can i know it?

    another question is, do i need to use ULN 2003A for controlling it using PIC16?

    if no, then what should i place between this motor and PORTB pins? should i place resistor?

    can i control its speed with PWM?

    thanks



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