Using the HiTechnic gyroscope sensor to measure angles

[janvos2506]

i did this

Code: Select all

import java.io.*;
import lejos.nxt.*;
import lejos.nxt.addon.GyroSensor;
import lejos.nxt.comm.*;
import lejos.util.Timer;
import lejos.util.TimerListener;

public class Angle {
     static GyroSensor gyro;
     static float degreesPerSecond;
     static int angle;
     static int UpdatePeriod = 10;
     
  public static void main(String [] args) throws Exception {
     gyro = new GyroSensor(SensorPort.S1);
     gyro.recalibrateOffset();
     
     while(true)
     {
        degreesPerSecond = gyro.getAngularVelocity();

        angle += degreesPerSecond*UpdatePeriod;
        System.out.println(angle);

        Thread.sleep(UpdatePeriod);
       
     }
  }
     
}

i used the recalibrateOffset thingy
and this gives me values that adds up like i turn it and then it goes from 0 to 3000 or something and then slowly goes back to 0 ?
i never knew it was so hard to get the actually angle can someone help me with what i am doing wrong?

[gloomyandy]

Your update period is in milliseconds but your velocity is in degrees per second, so you need to convert the time period into seconds. So something like...
angle += degreesPerSecond*UpdatePeriod*0.001;
You may also need to change angle to be a float rather than an int.

[janvos2506]

okay i tried that but it still just goes from a value bcd to 0 when i turn it...
i just want the same thing this guy has with the gyroscope
http://www.youtube.com/watch?v=WCTdTN7qPOg

[kirkpthompson]

Look into using the lejos.nxt.addon.GyroDirectionFinder class.
http://lejos.svn.sourceforge.net/viewvc/lejos/trunk/classes/src_shared/lejos/nxt/addon/GyroDirectionFinder.java?view=markup

Best,
-K

[janvos2506]

Thank you!!
i got it working now !!
i just used bits of code from the direction finder thingy and i got it working now
im so happy right now thank you all !!