Using tape to trigger sensors

  1. 2 weeks ago

    my team is trying to find a way to set a point on the launcher that it can detect, allowing it to fire and pull back to that point by pressing one button. one idea we had was placing black tape along the bottom of the slider and a strip of white tape at the desired point. we would use a line sensor to detect the white tape and pull back to that point. however, we're not sure if this would count as using non-vex parts. if it does, is there an alternative that is legal? thanks

  2. <R7> Robots are allowed the following additional “non-VEX” components:
    a. Any material strictly used as a color filter or a color marker for a VEX Light Sensor

    Yes, you should be allowed to do that, Rule R7 a.

  3. Edited 2 weeks ago by FullMetalMentor

    @caek Yes, you should be allowed to do that, Rule R7 a.

    Actually, <R7>a now says the following: "Any material strictly used as a color filter or a color marker for a VEX Light Sensor or Vision Sensor."

    I don't know if a Line Follower would qualify under <R7>a, so if you get a nitpicky inspector, you might get in trouble. (Somebody should ask in the official Q&A, but then be prepared to wait 3 weeks for an answer. LOL.)

    However, I've seen kids use pieces of white plastic to do exactly what the OP is asking about. And that would surely be allowed under <R7>e.

  4. Xenon

    Jan 10 Long Beach, California 99999V

    you could use white and black zipties or antislip mat too.

  5. last week

    Or just a potentiometer to track the position of the catapult axle.

  6. [deleted]

    Jan 10
    Deleted last week by DRow
  7. Xenon

    Jan 11 Long Beach, California 99999V

    @Got a Screw Loose Or just a potentiometer to track the position of the catapult axle.

    think they're using a puncher, but this could work as well. you may have to gear down the potentiometer so the shaft doesn't exceed the potentiometer's rangle.

  8. sabarrett328

    Jan 11 Grand Blanc, MI 46838C Major Trouble

    Couldn't the puncher hit one of the limit switch arms bent into the correct position while its retracting and this input would stop the motor? There would need to be enough travel in the arm to absorb any slop in the system so you didn't inadvertently refire the puncher but that may work

  9. Xenon

    Jan 12 Long Beach, California 99999V

    @sabarrett328 Couldn't the puncher hit one of the limit switch arms bent into the correct position while its retracting and this input would stop the motor? There would need to be enough travel in the arm to absorb any slop in the system so you didn't inadvertently refire the puncher but that may work

    but then you'd need a way to prevent it from sliding back from the rubber bands. either a brake motor hold, or just use a a ratchet

  10. squirrelman777

    Jan 14 Fairmont, WV 20610N

    You could use the white rope, and the black anti-slip mat.

 

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