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servo operation

Discussion in 'Sensors and Actuators' started by chuckd, Jul 27, 2011.

  1. chuckd

    chuckd

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    Jun 28, 2011
    Hello,

    I am using a servo for an electronics project that only requires the servo to be fully rotated CW or CCW, I dont need for it to be in any other position. I've only found one datasheet for a Parallax brand which explains the PWM control. My question is if I apply 0 volts or ground to the control wire will the servo rotate until the end of its range in one direction? And if I apply 6 volts will it rotate until the end of its range in the other direction? Also, the Parallax datasheet specified a range of 180 degrees, do the typical RC servos have a range of 90 degrees (as Wikipedia suggests)?

    Thanks for any feedback,
    Chuck
     
  2. BobK

    BobK

    7,609
    1,648
    Jan 5, 2010
    If it is a hobby servo, it requires a series of pulses on the control wire. 1.0 ms is fully CCW and 2.0ms is fully CW. The pulses need to be repeated aout 50 times / second. You cannot control the position with a voltage. The usual angle is 90 degrees, though they will typically go further than this with pulses that are out of spec.

    Bob
     
  3. chuckd

    chuckd

    5
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    Jun 28, 2011
    Thanks for the input Bob. I will use a PIC.
     
  4. BobK

    BobK

    7,609
    1,648
    Jan 5, 2010
    Good choice. I have a PIC low-pin-count demo board sitting on my desk next to me with a servo controlled by the pot on the board. I could send you the code if want as a starting point.

    Bob
     
  5. chuckd

    chuckd

    5
    0
    Jun 28, 2011
    Thanks for the offer, but my application is going to be a bit different since the control signal will be transmitted via an ethernet connection.

    Chuck
     
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