Calibrate the accelerometer and orientation sensor

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  I make application to read data from the accelerometer. I create the user interface using C++ and when the user clicks on the application startup button taking users accelerometer reading. I tried to update x, position y of the component and textarea or a text label. How can I do?

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• Connection of the accelerometer

  Dear all,

  I am writing a progrma that make use of the accelerometer to detect the orientation of the screen.

  The structure of my program is as below:

  I have a class call 'ABC', that the main function is in this class. In the main function, I use the pushscreen command to push the screen of another class 'DEF '. And I want to exec the acceleormeter in the class "DEF". If I use the command to open a connection to the accelerometer but it always return a null value.  I can't open the accelerometer and detect the orientation of the screen.

  Here is my code:

  Class ABC:

  import net.rim.device.api.applicationcontrol.ApplicationPermissions;
  import net.rim.device.api.applicationcontrol.ApplicationPermissionsManager;
  import net.rim.device.api.system.Display;
  import net.rim.device.api.ui.Ui;
  import net.rim.device.api.ui.UiApplication;
  
  public class ABC extends UiApplication      //ABC class
  {
      public static void main(String[] args)
      {
          /*Create a new thread of the application and make the currently
          running thread the application's event dispatch thread*/
          ABC app = new ABC();
          app.enterEventDispatcher();
      }
  
      //Constructor
      public ABC()
      {
          pushScreen(new DEF());
      }
  }       //End of ABC
  

  Class DEF:

  import java.io.IOException;
  import java.util.Vector;
  
  import javax.bluetooth.BluetoothStateException;
  import javax.bluetooth.DataElement;
  import javax.bluetooth.DeviceClass;
  import javax.bluetooth.DiscoveryAgent;
  import javax.bluetooth.DiscoveryListener;
  import javax.bluetooth.LocalDevice;
  import javax.bluetooth.RemoteDevice;
  import javax.bluetooth.ServiceRecord;
  import javax.bluetooth.UUID;
  
  import net.rim.device.api.bluetooth.BluetoothSerialPort;
  import net.rim.device.api.system.AccelerometerSensor;
  import net.rim.device.api.system.Application;
  import net.rim.device.api.system.Backlight;
  import net.rim.device.api.system.Bitmap;
  import net.rim.device.api.system.Display;
  import net.rim.device.api.system.AccelerometerSensor.Channel;
  import net.rim.device.api.ui.Graphics;
  import net.rim.device.api.ui.MenuItem;
  import net.rim.device.api.ui.Ui;
  import net.rim.device.api.ui.UiApplication;
  import net.rim.device.api.ui.component.Status;
  import net.rim.device.api.ui.container.MainScreen;
  
  public final class DEF extends MainScreen       //DEF class
   implements DiscoveryListener
  {
      //Constructor
      public DEF()        //DEF
      {
  
      }       //End of initscreen
  
      public void serviceSearchCompleted(int transID, int respCode)       //servicesearchcompleted
      {
          // TODO Auto-generated method stub
          switch (respCode)       //Select which response code
          {
          case SERVICE_SEARCH_COMPLETED:      //Service search completed
                  if (AccelerometerSensor.isSupported())      //Accelerometer is support
                  {
                      Channel accchan;
  
                      //Start querying the accelerometer sensor
                      //accchan = AccelerometerSensor.openRawDataChannel(super.getApplication());
                      //accchan = AccelerometerSensor.openRawDataChannel(UiApplication.getApplication());
                      //accchan = AccelerometerSensor.openRawDataChannel(UiApplication.getUiApplication());
                      //accchan = AccelerometerSensor.openRawDataChannel(Application.getApplication());
                      //accchan = AccelerometerSensor.openRawDataChannel(this.getApplication());
                      //accchan = AccelerometerSensor.openRawDataChannel(motor_car_2.getApplication());
  
                      int ori  = accchan.getOrientation();
  
                      //Stop querying the sensor
                      accchan.close();
  
                      switch (ori)        //Select which direction
                      {
                      case AccelerometerSensor.ORIENTATION_BOTTOM_UP:     //North
                      case AccelerometerSensor.ORIENTATION_TOP_UP:        //North
                      case AccelerometerSensor.ORIENTATION_RIGHT_UP:      //West
                          //Force to west direction
                          Ui.getUiEngineInstance().setAcceptableDirections(Display.DIRECTION_WEST);
                          break;      //End of north or west
  
                      case AccelerometerSensor.ORIENTATION_LEFT_UP:
                      default:        //East, horizontal or unknown
                          //Force to east direction
                          Ui.getUiEngineInstance().setAcceptableDirections(Display.DIRECTION_EAST);
                          break;      //End of east, horizontal or unknown
                      }       //End of select which direction
                  }
                  else        //Accelerometer is not support
                  {
                  }       //End of accelerometer is not support
              break;      //End of service search completed
          }       //End of select whioch response code
      }       //End of servicesearchcompleted
  }       //End of DEF class
  

  I think that this problem may be due to my poor concept in Java. Please provide some tips.

  Note: The class DEF is a listener of bluetooth device discovery. I run in debug mode and make sure that the code executed at these lines open the accelerometer. But all return null. So I can't treat more steps.

  My target is to detect the orientation of the screen and the limit to this complementary process direction.

  Thank you for your help in advance.

  Best regards

  Albert Siu

  Fix there issue.

  The issue is due to bad I opened the channel as a channel of raw. If it throws an exception in the getorientation function.

  Thanks for your help.

• Accelerometer and GPS - can´t to operate

  Hello

  I am writing a small application to test the accelerometer and GPS. Unfortunately it does not work and I get no updates of the sensors.

  This is my code:

  package
  {
      import flash.display.Sprite;
      import flash.events.AccelerometerEvent;
      import flash.events.GeolocationEvent;
      import flash.events.MouseEvent;
      import flash.media.Camera;
      import flash.media.Video;
      import flash.sensors.Accelerometer;
      import flash.sensors.Geolocation;
      import flash.text.TextField;
      import flash.text.TextFormat;
  
      import qnx.ui.buttons.Button;
      import qnx.ui.buttons.LabelButton;
  
      [SWF(width="1024", height="600", backgroundColor="#cccccc", frameRate="30")]
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      { 
  
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          public function AIRHelloWorld()
          {
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              var geo:Geolocation;
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              geoTextField.x=10;
              geoTextField.y=10;
              geoTextField.width=400;
  
              accTextField.x=10;
              accTextField.y=30;
              accTextField.width=400;
  
              addChild(geoTextField);
              addChild(accTextField);
  
              if (Geolocation.isSupported)
              {
                  geo = new Geolocation();
                  geo.addEventListener(GeolocationEvent.UPDATE, updateHandler); 
  
                  geo.setRequestedUpdateInterval(1000);
                  geoTextField.text = "Geolocation feature is supported";
              }
              else
              {
                  geoTextField.text = "Geolocation feature not supported";
              } 
  
              if (Accelerometer.isSupported)
              {
                  acc = new Accelerometer();
                  acc.setRequestedUpdateInterval(100);
                  acc.addEventListener(AccelerometerEvent.UPDATE, accupdateHandler);
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              } else
              {
                  accTextField.text = "Accelerometer feature is not supported";
              }
  
              stage.nativeWindow.visible = true;
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          private function updateHandler(event:GeolocationEvent):void
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                  + "speed: " + event.speed.toString()
                  + "heading: " + event.heading.toString()
                  + "horizontal accuracy: " + event.horizontalAccuracy.toString()
                  + "vertical accuracy: " + event.verticalAccuracy.toString()
          }
  
          private function accupdateHandler(event:AccelerometerEvent):void
          {
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          }
      }
  }
  

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  Thanks in advance!

  Hi maltic,

  the problem is that you're declaring variables of geo and CAC inside the constructor, then when it stops, your valuables are gone as well.

  Move the two statements to be global to the class (same place, you stated the TextFields) and you'll have it working properly.

  In addition, you should also test geo.muted, because it will tell you if your application has the rights to read the data of geolocation or not.

  I hope that helps!

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  In this VI, the desired position and orientation of the definitions effector

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  First;

  I want to know How can I control the position and orientation of a rigid body through Simulator display with a mouse?

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