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Motor Driven Focuser

Discussion in 'Sensors and Actuators' started by p1taylor, Jun 24, 2012.

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  1. p1taylor

    p1taylor

    16
    0
    Jun 24, 2012
    Hi all, I am very new to this, what I am trying to do is drive my telescope focuser with a Epson EM-483 Stepper Motor, have all the electrics out of printer, what I would like to do is have 2 push buttons 1 forward and 1 revers, do not need it connected to computer option would be OK.

    peter
     
  2. p1taylor

    p1taylor

    16
    0
    Jun 24, 2012
    Hi, I have bean Reading a lot, the stepper motor I have is bipolar 4 wires 1and 3=3.4hom, 2and 4 3.4 hom any other is infinite as fare as I can tell it bipolar, so I need to do micro steps to give about 3000 or 4800 steps per rev so what do I need to get this, am lost in electronics, as fare as I see it do I go for 2 H-Bridge L293D or what, found what may be beter motor 28YB-48 stepper motor, if you need any more inf just let me know,

    peter
     
  3. GreenGiant

    GreenGiant

    830
    6
    Feb 9, 2012
    are you going to be using a microcontroller to control the stepper motor?
    or do you have a some ICs that are going to pulse correctly for it?

    If you want it to be more accurate you may be better off trying to use a servo, these can increment in tiny amounts and many can spin any number of times
     
  4. p1taylor

    p1taylor

    16
    0
    Jun 24, 2012
    Hi, This may be silly but what is a microcontroller, do not have any ic, will a servo have power to do job, engineering is simple electronics I am lost, if I have a diagram can do it.

    peter
     
  5. GreenGiant

    GreenGiant

    830
    6
    Feb 9, 2012
    How were you planning on turning the stepper motor?
    Unless the ones that you are looking at have a controller board with them that you can control the speed with you need some form of control circuitry or programming through a microcontroller.

    A microcontroller is technically a small IC that can be programmed to do many different things based on inputs, timing, and outputs.

    Servos range from very weak to extremely powerful, as do stepper motors, but to focus a telescope it shouldnt take a very powerful one, just something with high accuracy (the more common servos are accurate to 1 degree typically, but they come accurate down to 1/10 of a degree as far as I have seen, though they do get more expensive.
     
  6. mostafa_naderi

    mostafa_naderi

    6
    0
    Jun 7, 2012
    How much torque do you need? (force for Rotation)
    If your knowledge of electronics is low you can use step motor driver
    this driver is more Expensive but ready for use
    if you want to make i can help you ...for programing and make pcb
     
  7. p1taylor

    p1taylor

    16
    0
    Jun 24, 2012
    Hi GG, As you say with some control circuit, I was hoping someone had don this before and will let me use there diagram, bean doing a lot of reading about this found a ideal motor + gear box which dos 4096 steps / rev, so all I need is driver, have power supply gives 5.6 volt and 42.3 volt, relay hope some one can help.

    peter
     
  8. p1taylor

    p1taylor

    16
    0
    Jun 24, 2012
    Thank you very much for your kind offer I would really appreciate it, I Don't need much torque Crayford focuses are very free, what I have found so fare is a L298 stepper motor driver, 28YB-48 motor + gearbox at 4096 steps/rev not to dear but I will need 2 sets, one for Meade RCX 10" to be run from Maxim and focusmax, the other the guide scope just on 2 buttons one in the other out, in a lot of ways I would like to mack it, if you need any more info let me know.

    peter
     
  9. mostafa_naderi

    mostafa_naderi

    6
    0
    Jun 7, 2012
    I send to you pm plz answer

    what is RCX 10"
     
  10. p1taylor

    p1taylor

    16
    0
    Jun 24, 2012
    Meade RCX 10" is main telescope, guide scope is a William Optics ZS 80 mm II ED.

    peter
     
  11. p1taylor

    p1taylor

    16
    0
    Jun 24, 2012
    Yes I will answer.

    peter
     
  12. p1taylor

    p1taylor

    16
    0
    Jun 24, 2012
    Hi, I found this stepper motor driver A4988 it can microstep in 1/2, 1/4, 1/8 and 1/16 plus has voltage and current regulation, do you think it will drive 28YB-48 stepper motor or the Epsom EM- 483 I have.

    peter
     
    Last edited: Jun 28, 2012
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