Continues Servo motor controller HELP

Discussion in 'General Electronics Chat' started by bryjosh316, May 12, 2014.

  1. bryjosh316

    Thread Starter New Member

    May 12, 2014
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    How to make a controller for my converted servo motor to continues rotation

    so that i can control the speed and forward/reverse of the motor,(no programming)

    i researched online and i found out about the lm555 timer IC but the two functions i want is made with two different circuit. i want to be able to use it in one circuit..

    looking forward for your help
     
  2. djsfantasi

    AAC Fanatic!

    Apr 11, 2010
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    Continuous rotation servos (hobby RC servos) are controlled in the same manner as a standard servo. Pulses of varying widths are applied every 20ms. These pulses vary from ~1300μs to ~1700μs.
    * 1300μs rotates clockwise
    * 1500μs stopped
    * 1700μs rotates counterclockwise

    To modify the servo speed, intermediate values of the pulse widths are used. For example, a width of 1475μs rotates the motor clockwise slowly.

    The following link describes this with a picture as well:
    http://learn.parallax.com/KickStart/900-00008

    This can be done with two 555s. The first 555 is wired as an astable oscillator running at 50Hz. It triggers a second 555 wired in monostable mode. A pot is used with this portion of the circuit to vary the pulse width. One such circuit can be found on the Seattle Robotics Society site.
    http://www.seattlerobotics.org/encoder/200210/servoex/ServoExcerciser.htm

    Hope this helps.
     
    Last edited: May 12, 2014
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  3. bryjosh316

    Thread Starter New Member

    May 12, 2014
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    any other way or better yet circuit diagram for the function i want
     
  4. djsfantasi

    AAC Fanatic!

    Apr 11, 2010
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    The second link I provided has the circuit diagram.
     
  5. MaxHeadRoom

    Expert

    Jul 18, 2013
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    Is this RC or an industrial servo?
    Both typically have very different types of control.
    Max.
     
  6. djsfantasi

    AAC Fanatic!

    Apr 11, 2010
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    Yes! I did specify hobbyist RC motors in a previous post.
     
  7. MaxHeadRoom

    Expert

    Jul 18, 2013
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    My question was to the OP, he did not specify? ;)
    Max.
     
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  8. bryjosh316

    Thread Starter New Member

    May 12, 2014
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    yes its RC servo sorry for not being specific
     
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