Class LCP - direct command/ system command

[gbh]

Greetings.

I'm currently looking for the code to control NXT brick without uploading and run .nxt file in the NXT brick.
Upon research, I found Mindroid application which using the LCP class constants with Direct command and System command via bluetooth connection is able to do so.
Here is the class link : http://lejos.sourceforge.net/nxt/nxj/ap ... m/LCP.html
But, it only able to control the nxt motor ports and is much more different compared with the Class Pilot.

May I know which constant field in the LCP class is able to control sensor ports and get sensor readings?

Thanks.

[gloomyandy]

What do you want to run your program on? If it is a Mac/Linux/Windows PC then you have a pretty complete set of classes available using the leJOS PC API:
http://lejos.sourceforge.net/nxt/pc/api/index.html
The tutorials have more details on using the API:
http://lejos.sourceforge.net/nxt/nxj/tutorial/index.htm

If you are trying to run your program on Android then I'm sorry I can't help, perhaps others can...

Andy

[gbh]

Thanks for the reply.

hmm... yes, the program is running on Android.

[Shawn]

Hi,

The android stuff is only in svn.

There shouldn't be too much difference between standard leJOS and android here (other than android can't do the robotic package).

The TachoCount example shows how to use motors:

Code: Select all

public class TachoCount {
   
   public static void main(String [] args) throws Exception {
      NXTConnector conn = new NXTConnector();
      conn.addLogListener(new NXTCommLogListener() {
         public void logEvent(String message) {
            System.out.println(message);            
         }

         public void logEvent(Throwable throwable) {
            System.err.println(throwable.getMessage());         
         }         
      });
      conn.setDebug(true);
      if (!conn.connectTo("btspp://NXT", NXTComm.LCP)) {
         System.err.println("Failed to connect");
         System.exit(1);
      }
      NXTCommand.getSingleton().setNXTComm(conn.getNXTComm());
      
      System.out.println("Tachometer A: " + Motor.A.getTachoCount());
      System.out.println("Tachometer C: " + Motor.C.getTachoCount());
      Motor.A.rotate(5000);
      Motor.C.rotate(-5000);
      Thread.sleep(10000);
      Sound.playTone(1000, 1000);
      System.out.println("Tachometer A: " + Motor.A.getTachoCount());
      System.out.println("Tachometer C: " + Motor.C.getTachoCount());
      conn.close();
   }   
}

I'm not so sure about sensors via LCP but the PC examples has:

Code: Select all

   /**
 * This is a test of remote reading of sensors from the PC
 * using the iCommand equivalent classes in pccomm.jar
 *
 * @author Lawrie Griffiths
 *
 */
public class SensorTest {
   public static void main(String[] args) {
      LightSensor light = new LightSensor(SensorPort.S1);
      SoundSensor sound = new SoundSensor(SensorPort.S2);
      TouchSensor touch = new TouchSensor(SensorPort.S3);
      UltrasonicSensor sonic = new UltrasonicSensor(SensorPort.S4);
      
      while(sound.readValue() < 90) {      
         System.out.println("light = " + light.readValue());
         System.out.println("sound = " + sound.readValue());
         System.out.println("touch = " + touch.isPressed());
         System.out.println("distance = " + sonic.getDistance());
         try {
            Thread.sleep(1000);
         } catch (InterruptedException ie) {}
      }
   }
}

Give it a try and if that doesn't work, perhaps see the link below. Anyway, as I said using LCP should be the same for Android so any posts you see related to that should apply.

see http://lejos.sourceforge.net/p_technologies/nxt/nxj/api/lejos/nxt/remote/RemoteNXT.html

Shawn

[CrazyRobotMan]

A great tutorial for the Lego LCP is here:

http://www.robotappstore.com/Knowledge- ... ms/92.html

If you also go to the store section, and then under the navigation tab, there is a free app you can download called NXT navigation that runs over bluetooth on the android. (http://www.robotappstore.com/Apps/NXT-E ... B6F082439E)

I'm not terribly familiar with the differences in the android OS, but as long as you are sending the correct LPC commands you should be fine.