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Electrically controlled expandable rod

Discussion in 'LEDs and Optoelectronics' started by icydash, Sep 27, 2014.

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  1. icydash

    icydash

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    May 22, 2013
    Hey all,

    I'm working on a project and could use some advice for a component part. The project is a small robot that's about two inches long. The robot needs to have some kind of microcontroller-controllable retractable/expandable rod or arm that fits within about an inch space, but can expand out to about 3 inches. That arm will have a sensor on the end and reach out and "touch" things. I'm not sure what to do for the expandable arm component. I've been thinking of some kind of electronic antenna-type thing, but could really use some help! Of course the cheaper and sturdier the better (because if the robot runs into a wall, I don't want the arm to bend).

    Thanks in advance!
     
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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  3. Colin Mitchell

    Colin Mitchell

    1,417
    312
    Aug 31, 2014
    It's called a SCREW JACK
     
  4. Colin Mitchell

    Colin Mitchell

    1,417
    312
    Aug 31, 2014
    You can also use a servo with a crank and push-rod
     
  5. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Jan 21, 2010
    I was thinking about a scissor arm, although you could possibly activate this using a jack screw.
     
  6. KMoffett

    KMoffett

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    Jan 21, 2009
    Google: micro miniature linear servo

    Ken
     
  7. icydash

    icydash

    12
    0
    May 22, 2013
    Thanks for all the suggestions! I was thinking about something like a scissor arm or jack screw, but I'm not quite sure how to electrically actuate those. The miniature linear servo may work -- with one of those, can I control how far out the pin extends, or is it either (1) all the way out; or (2) all the way in? Do you have any suggestions for a specific part on like Digikey (sorry, I'm bad at looking at the bagillion parts on Digikey and finding the right one!)
     
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