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Standard Servo Rotation — Parallax Forums

Standard Servo Rotation

TutTut89TutTut89 Posts: 10
edited 2006-03-14 20:19 in General Discussion
How do you know how far a standard servo rotates? Do they all rotate 180 degrees? Here is one that I have been looking at and don't know the amount of rotation. I am assuming it is 60 degrees, because that is what the speed uses, but I hope I'm wrong. www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXDEL5&P=0

Comments

  • Paul BakerPaul Baker Posts: 6,351
    edited 2006-03-14 03:47
    Ive seen 3 common values, the most prominent are 180 and 120, Ive also seen 90. Digital servos can be programmed for thier angular travel.

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  • bulkheadbulkhead Posts: 405
    edited 2006-03-14 06:57
    I think most servos go to 180 degrees or around that. I'm pretty sure the one in that link does 180. It only gives specs on 60 degree travel because for RC applications, only 60 degrees of travel is needed to steer or control throttle. With a standard RC tx and rx you will only get 60 degrees of travel, but if you use a stamp, you can adjust the PWM and get the full 180 degrees, the only limit is the physical stopper in the servo and how far a servo's potentiometer will turn.
  • LoopyBytelooseLoopyByteloose Posts: 12,537
    edited 2006-03-14 16:22
    Standard? Not really much possiblity of one unless you presume Futaba is a 'defacto standard'.

    Does the same code work for 180 degree servo used only for 90 degrees of arc?
    Or are the extremes different code?

    I suspect you have to massage your code to fit whatever you have installed.
    Matched sets are best within one project. At least matched pairs for wheels.

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    "When all think alike, no one is thinking very much.' - Walter Lippmann (1889-1974)

    ······································································ Warm regards,····· G. Herzog [noparse][[/noparse]·黃鶴 ]·in Taiwan
  • Ryan ClarkeRyan Clarke Posts: 738
    edited 2006-03-14 20:19
    What a 'standard' servo is rated and what it will actually do are most often two different things. Test each servo directly- even two servos from the same manufacturer can have different amounts of travel- this can be due to the variances in parts-

    Think of it this way:

    The mechanical stop in servos (standard) are what prevent the rotation from physically going 360- the pulse widths needed to get to the max positions will vary as the pots/resistors/misc. parts in the servo vary (generally less expensive parts are used)-

    Ryan

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    Ryan Clarke
    Parallax Tech Support

    RClarke@Parallax.com
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