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Thread: Accelerometer Cost

  1. #11

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    Balancing using distance measurement (with ldr/adc).

    The readings will vary depending on the surface the robot is over. And as far as i can see for neat balancing you would want consistent readings.

  2. #12
    Super Moderator T-1000 docel's Avatar
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    No pratap...! Not for dist. measurement and balance correction.
    I was suggesting something else....a homebrew Tilt sensor!
    docel
    ^Anything is possible..
    after YOU prove it!!

    http://bangalorerobotics.tripod.com

  3. #13

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    I knew you would come up with something great!

    So how to go about brewing a tilt sensor? Whats the idea

  4. #14
    Administrator T-1000 vikas's Avatar
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    im interested too
    Vikas Patial

  5. #15
    Senior Member Cyborg
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    i have an idea !!!!!!

    not know, it is feasible or not. How about with mercury like in mercury switch (never saw that also ) now we have tube in which inner walls have variable resistance point and one point (metal contact) it at base , so when tube is tilted the mercury make contact with variable resistors point and the resistance at base point is change so we can calculate the tilt

  6. #16
    Super Moderator T-1000 docel's Avatar
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    OK!
    Here's a hint!!
    Inverted heavy triangle, 2 pairs of LED-LDRs,
    docel
    ^Anything is possible..
    after YOU prove it!!

    http://bangalorerobotics.tripod.com

  7. #17
    Administrator T-1000 vikas's Avatar
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    Docel i tried this ... the whole heavy triangle which is supposed to remain stationary gives results when the robot moves side ways slowly ... but if you leave the robot and let it fall , the triangle does not give that a fast a response time. I never thought of this problem before starting .

    Another way i found was to use a combination of IR tx/rx and use the intensity of light reflected off ground to determine the tilt ... way cheap but the only issue is that you require a constant surface !
    Vikas Patial

  8. #18
    Super Moderator T-1000 docel's Avatar
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    Fast response is possible using LED source & Led detector ( IR or Visible).
    The Heavy triangle needs to be 'damped' to prevent oscillations.
    This cannot be applied to slow gear-box.
    Works like a dream with Servos!!!
    speed can be "graded " using multiple sensors with ADC thresholds.
    docel
    ^Anything is possible..
    after YOU prove it!!

    http://bangalorerobotics.tripod.com

  9. #19
    Administrator T-1000 vikas's Avatar
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    The LED response / daming is not the problem.

    The problem is that when the robot slips to one side the whole of the triagle also goes along with it ... i should have made a video. Its ok if its slow (then it works fine) but not when it fast when its actually falling. But i dont think such a thing is possible in a small robot ( i tried many variateon in my bot and didnt work out ... next im gonna give IR based one a try ).
    Vikas Patial

  10. #20
    Senior Member Cyborg
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    hey guys any comments (negative or positive), on my idea on this using mercury switch kind of system

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