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Controlling servos over long distances

Discussion in 'Sensors and Actuators' started by jackytwoshoes, May 17, 2012.

  1. jackytwoshoes

    jackytwoshoes

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    0
    May 17, 2012
    I have 2 simple servo controllers which use a rotary potentiometer to control the position of a servo.

    I want to have the controllers by my side and the two servos about 20m away in two seperate locations. Can I use some cheap 3-core cable or will I suffer to much loss with that much cable? Do I need to look at radio control?
     
  2. KMoffett

    KMoffett

    682
    65
    Jan 21, 2009
    Do you want the potentiometers at one end of the cable and the controller/servo at the other end, or the pot/controller at one end and the servos at the other?

    Ken
     
  3. jackytwoshoes

    jackytwoshoes

    6
    0
    May 17, 2012
    Thanks for your reply. I'm happy with either- whichever allows me to use the cheapest and longest cables without problems, although ideally the pot/ controllers at one end and the servo at the other.
     
  4. KMoffett

    KMoffett

    682
    65
    Jan 21, 2009
    1. If the pots are just changing a DC level in the controller, than it would be easiest to have the pot on one end and the controller/servo on that other.
    2. If the pots are part of an oscillator circuit in the controllers and have pulsing voltages on them, I would opt for the pot/controller on one end and servo on the other.
    3. I did a 100ft CAT5 cable link between a R/C servo drive signal and a computer input. I was monitoring the timing as a function of position of a solar tracker. To assure that I had accurate timing, I used a MIC4427 MOSFET gate driver. I had no signal degradation. I didn't try it without the driver.

    Ken
     
  5. jackytwoshoes

    jackytwoshoes

    6
    0
    May 17, 2012
    Thanks for this, the pots are indeed just changing a DC level in the controller and are working great over 100m of CAT 5 cable.

    The problem I now face is that when I connect two controllers/servos to the same power supply they are causing the servos to twitch a little. How can I de-couple them?
     
  6. jackytwoshoes

    jackytwoshoes

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    0
    May 17, 2012
    Perhaps I should have said, the circuits are currently running form batteries but will eventually be from a wall-wart style mains PSU.
     
  7. KMoffett

    KMoffett

    682
    65
    Jan 21, 2009
    A schematic or sketch of your setup would help us visualize where your problem might reside.

    Ken
     
  8. jackytwoshoes

    jackytwoshoes

    6
    0
    May 17, 2012
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