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Is there a way to expand servo turning range for an RC transmitter? — Parallax Forums

Is there a way to expand servo turning range for an RC transmitter?

FlyingFishFingerFlyingFishFinger Posts: 461
edited 2005-09-05 08:59 in BASIC Stamp
Is thera a way to make the turning range for a servo the full 180 degrees over a RC set that normally turns the servo 90 degs?I still can't control my Hitec servo over the BS2p, was just wondering if I could use the stamp to manipulate the rc reciever for servo control?
Rafael

Comments

  • FlyingFishFingerFlyingFishFinger Posts: 461
    edited 2005-09-04 21:45
    It is absolutely essential that I can use the full 180 degree range because my design(=robot turning range) (and also my servo mount) are based on this fact. Everything else in my system works. I ran a test with the limited 90 degrees of the rc system and that worked, but too large turning range mad.gifmad.gifmad.gif

    Rafael
  • Brian CarpenterBrian Carpenter Posts: 728
    edited 2005-09-04 23:35
    there are some modifications that you can do to a servo, disassemble and change some resistors. do a google search for just that. i have done it. i dont remember the resistor values though. it is out there and google knows. let me know if you dont find it and i will look.

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    It's Only A Stupid Question If You Have Not Googled It First!!
  • FlyingFishFingerFlyingFishFinger Posts: 461
    edited 2005-09-05 01:15
    Would this, if I did get the stamp control to work, make the turning range greater than 180 degrees?
    Rafael
  • Brian CarpenterBrian Carpenter Posts: 728
    edited 2005-09-05 01:36
    yes.

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    It's Only A Stupid Question If You Have Not Googled It First!!
  • Brian CarpenterBrian Carpenter Posts: 728
    edited 2005-09-05 01:41
    try this. http://www.junun.org/MarkIII/Manual/kevin/servohack.html

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    It's Only A Stupid Question If You Have Not Googled It First!!
  • Brian CarpenterBrian Carpenter Posts: 728
    edited 2005-09-05 01:47
    sorry. dont use that one. use this one. http://mypage.yhti.net/~dmcdnld/s148retract.htm

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    It's Only A Stupid Question If You Have Not Googled It First!!
  • FlyingFishFingerFlyingFishFinger Posts: 461
    edited 2005-09-05 02:35
    Well, thanks for the info, but if this causes the total ROM to increase(and thereby increase·self-destruct risks, my Hitec servo has over 20 kg/cm torque), I'll try to duplicate the pulses using external circuitry.

    Thanks for the trouble, though.

    Rafael
  • Brian CarpenterBrian Carpenter Posts: 728
    edited 2005-09-05 03:45
    there is no risk, that i see. i have used this method many times before.

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    It's Only A Stupid Question If You Have Not Googled It First!!
  • FlyingFishFingerFlyingFishFinger Posts: 461
    edited 2005-09-05 03:53
    Anyway I'd prefer not to use hardware modification
    Thanks
    Rafael
  • LoopyBytelooseLoopyByteloose Posts: 12,537
    edited 2005-09-05 08:59
    You can now add gears to servos.

    Obviously, if the servo shaft has a big gear and the output shaft has a small gear - you get an increase in travel.

    You might even get two or three revolutions.

    It is a great question. Most people are thinking about using the gears to increase power or adjust speed.

    But in this application, you can create new options for walking designs. Thanks.

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    G. Herzog in Taiwan
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