Added PartyFinder code

lesson3/PartyFinder/src/PartyFinder.java

+import lejos.nxt.*;
+public class PartyFinder {
+	static final double turnDegree = 0.08797653958;
+
+	static final long sampleInterval = 25;
+	
+	static MotorPort leftMotor  = MotorPort.C;
+	static MotorPort rightMotor = MotorPort.B;
+	
+	static ADSensorPort soundSensorLeft = SensorPort.S2;
+	static ADSensorPort soundSensorRight = SensorPort.S3;
+	
+	static int leftValue;
+	static int rightValue;
+	static int diff;
+
+	public static void main(String[] args) throws Exception {
+		soundSensorLeft.setTypeAndMode(SoundSensor.TYPE_SOUND_DB, SoundSensor.MODE_PCTFULLSCALE);
+		soundSensorRight.setTypeAndMode(SoundSensor.TYPE_SOUND_DB, SoundSensor.MODE_PCTFULLSCALE);
+		LCD.clear();
+		LCD.drawString("Finding the party", 0, 0);
+		while (!Button.ESCAPE.isDown()) {
+			leftValue = soundSensorLeft.readRawValue();
+			rightValue = soundSensorRight.readRawValue();
+
+			if(leftValue < 940 && rightValue < 940) {
+				diff = leftValue - rightValue;
+
+				if(diff < 0) {
+					// Party is to right
+					right(75);
+				} 
+				else if(diff > 0) {
+					// Party is to left
+					left(75);
+				}
+				else {
+					// Party is straight ahead ( or behind you :( )
+					forward(75);
+				}
+			} else {
+				stop();
+			}
+			// Debug info
+			LCD.drawInt(leftValue,4,0,1);
+			LCD.drawInt(rightValue,4,0,2);
+			LCD.drawInt(diff,4,0,3);
+			
+			Thread.sleep(sampleInterval);
+		}
+	}
+	
+	public static void stop() {
+		leftMotor.controlMotor(0, MotorPort.STOP);
+		rightMotor.controlMotor(0, MotorPort.STOP);
+	}
+	
+	public static void forward( int power)
+	{	
+		leftMotor.controlMotor(power, MotorPort.FORWARD);
+		rightMotor.controlMotor(power, MotorPort.FORWARD);	
+	}
+	public static void left( int power)
+	{	
+		leftMotor.controlMotor(power, MotorPort.FORWARD);
+		rightMotor.controlMotor(power / 4, MotorPort.FORWARD);	
+	}
+	public static void right( int power)
+	{	
+		leftMotor.controlMotor(power / 4, MotorPort.FORWARD);
+		rightMotor.controlMotor(power, MotorPort.FORWARD);	
+	}
+}