nxt cam LineTracking TOPIC

[smart_app123]

I try to do a light racing activity using nxt Cam V5, if you find a line, go straight along that line and make a left turn if you do not see it,
However, several lines are detected, not lines, but lines are detected as non-lines.
And I do not know how the scope of nxt cam is implemented.

I simply tried coding.

import lejos.hardware.Button;
import lejos.hardware.Sound;
import lejos.hardware.motor.Motor;
import lejos.hardware.port.SensorPort;
import lejos.hardware.sensor.EV3ColorSensor;
import lejos.utility.Delay;

public class nxtCamTest {
final static int INTERVAL = 1000;
final static NXTCamV5 Senser= new NXTCamV5(SensorPort.S2);
public static void main(String[] args) {
System.out.println("NXTCamV5 LINE_TRACKING");
Senser= .setTrackingMode(NXTCamV5.LINE_TRACKING);
while (!Button.ESCAPE.isDown()) {
int trackedObject = Senser= .getNumberOfObjects();
System.out.println(trackedObject);


if(Button.UP.isDown() == true)
{
Motor.A.setSpeed(100);
Motor.A.forward();
}

if(Button.DOWN.isDown() == true)
{
Motor.A.setSpeed(100);
Motor.A.backward();
}

if (trackedObject > 0)
{
Delay.msDelay(20);
Motor.B.setSpeed(180);
Motor.C.setSpeed(180);
Motor.B.forward();
Motor.C.forward();
//Delay.msDelay(500);
}
else
{
Delay.msDelay(20);
Motor.B.setSpeed(1);
Motor.C.setSpeed(100);
Delay.msDelay(500);
}

while (Button.ESCAPE.isDown()) { // exit
Senser.close(); //
System.exit(0);
}
Delay.msDelay(500);
}
}
}



*************
I want help, and can I ask another question? Is it red, moving along the line? Can you stop or advance when you find green?
I wonder,

[gloomyandy]

Sorry can't help as I've never tried to use the NXTCam in line tracking mode. What I can say is that the NXTCam is a very complex sensor to work with and is very sensitive to the lighting conditions that you are using it under (as are all low cost camera based sensors). It will not be an easy project to work with.

Oh and if you are posting code please use the code tags it makes it much easier to read.

[smart_app123]

What does the code tag mean?

Well .. I want the same action as the YouTube video below.

https://youtu.be/0Z0MfPTkpmU

https://youtu.be/3uou9r59vzc

[gloomyandy]

The code tags are used to surround code. When you are making a post look just above where you are typing you will see a line of buttons labelled..
"B" "i" "u" "Quote" "Code" etc.

These can be used to format your post. If you use the "Code" tag then your code will look like this...

Code: Select all

   private static int convertYUVtoARGB(int y, int u, int v) {
        int c = y - 16;
        int d = u - 128;
        int e = v - 128;
        int r = (298*c+409*e+128)/256;
        int g = (298*c-100*d-208*e+128)/256;
        int b = (298*c+516*d+128)/256;
        r = r>255? 255 : r<0 ? 0 : r;
        g = g>255? 255 : g<0 ? 0 : g;
        b = b>255? 255 : b<0 ? 0 : b;
        return 0xff000000 | (r<<16) | (g<<8) | b;
    }


Which is much easier to read.

[smart_app123]

I do not know what that function does.
What is int y, u, v?

[gloomyandy]

Ignore the code it was just and example of how to use the code tags!