Robot behaviours

Behaviour based robots was used in the teaching as way of getting the students to think out AI a little deeper and in particular Do we need Human Level intelligence? or rather Do we always need to aim for Human Level Intelligence?


Lego mindstorms robot are a good vehicle for students to start trying out idea around behaviour-based robotics. They are inexpensive, programmable and with the LeJOS software installed on them have behaviours built into the programming which is done in Java.


A good example to use comes from Bagnall's book (B Bagnall (2002) Core Lego Mindstorms: 

Programming the RCX in Java , ISBN: 978-0130093646)

code 1: HitWall

//Taken from Bagnall (2002)
import josx.robotics.*;
import josx.platform.rcx.*;
public class HitWall implements Behavior
{
public boolean takeControl()
{
return Sensor.S2.readBooleanValue();
}
public void suppress()
{
Motor.A.stop();
Motor.C.stop();
}
public void action()
{
Motor.A.backward();
Motor.C.backward();
try{Thread.sleep(1000);}catch(Exception e){}
Motor.A.stop();
try{Thread.sleep(300);}catch(Exception e){}
Motor.C.stop();
}
}

Code 2: DriveForward

//Taken from Bagnall (2002)


import josx.robotics.*;
import josx.platform.rcx.*;
public class DriveForward implements Behavior
{
public boolean takeControl()
{
return true;
}
public void suppress()
{
Motor.A.stop();
Motor.C.stop();
}
public void action()
{
Motor.A.forward();
Motor.C.forward();
}
}



Code 3: Bumper Car

import josx.robotics.*;
public class BumperCar
{
public static void main(String [] args)
{
Behavior b1=new DriveForward();
Behavior b2=new HitWall();
Behavior [] bArray ={b1,b2};
Arbitrator arby=new Arbitrator(bArray);
arby.start();
}
}