Vision sensor exists code

Programming Support
1

hi i need help with the exists function in the vision sensor class.

im talking about this:
image

when i use the function theres an error:
image

im stupid, can you help me?

2

You need to add an object to the code. If you are looking for the largest object it would be

VS.largestObject.exists()
3

exists() is for vision objects, not the sensor itself. You probably want to do something like
VS.largestObject.exists()

4

This isn’t necessarily super important, but you shouldn’t use a comparison to false. Just use something like

if (!VS.largestObject.exists()) {
code
}

5

yeah i got this to work

but now i have another problem
the vision sensor wont stop when its in front of the object and always turns left no matter where the object is.

here is the code

while(1){
        // VS.takeSnapshot(VS__RED_HG);
        // if (VS.objectCount == 0){
        //   VS.takeSnapshot(VS__BLUE_HG);
        // }
        // //find if hg is red or blue and take a snapshot
        VS.takeSnapshot(VS__RED_HG);

        if (VS.largestObject.centerX > centerFOV + offsetX){ //object is off to the right of the vision sensor
          RDrive.spin(reverse, 20, pct);
          LDrive.spin(forward, 20, pct);
        }
        else if (VS.largestObject.centerX < centerFOV - offsetX){ //object is off to the left of the vision sensor
          RDrive.spin(forward, 20, pct);
          LDrive.spin(reverse, 20, pct);
        }

        else{ //when bot is aligned, rumble and stop
          Chassis.stop();
          Chassis.setStopping(coast);
          Controller1.rumble("-");
        }

        if (autoAim==false){
          break;
        }
      }
1 Like
6

I recommend looking into using a PID. Here’s a good guide:
introduction_to_pid_controllers_ed2.pdf (400.2 KB)

7

hi everyone
I got it to work, turns out the vision sensor I was using was bad

thanks for ur help though!