Robot that searches for lights

Question

I use Lego Mindstorms NXT 2.0. I want to schedule my robot to move to where there is light αnd then when it finds it (a large amount of light, for example 80%) to stop and move another motor for 30 degrees. Then stay still for 10 seconds and after that to search for another light.

Can you help me please?

I use

port B: right motor

port C: left motor

port A: the degrees motor

port 3: a light sensor

Answer 1

In pseudocode:

LoopBlock (forever)
    MoveBlock (B and C motors, 75% power, forward, forever)
    -- unclear here, probably want to head for brighter light
    -- instead, just wait for 80%
    If LightSensorBlock (port 3, greater than, threshold 80%) Then
         MoveBlock (B and C motors, stop)
         WaitForBlock (time, 10 seconds)
    End If
End Loop

Answer 2

#pragma config(Sensor, S3,     lightSensor,         sensorLightActive)
//*!!Code automatically generated by 'ROBOTC' configuration wizard               !!*//


task main()
{
   wait1Msec(50);                        // The program waits 50 milliseconds to initialize the light sensor.

   while(true)                           // Infinite loop
   {
      if(SensorValue(lightSensor) < 45)  // If the Light Sensor reads a value less than 45:
      {
        motor[motorB] = 0;                  // Motor B is run at a 0 power level.
        motor[motorC] = 30;                  // Motor C is run at a 30 power level.
      }
      else                               // If the Light Sensor reads a value greater than or equal to 45:
      {
        motor[motorB] = 50;                  // Motor B is run at a 50 power level.
        motor[motorC] = 50;                  // Motor C is run at a 50 power level.
        while (SensorValue(lightSensor) >80) // If the Light Sensor reads a value MORE than 80:

{

  motor[motorC] = 0;  

  motor[motorB] = 0;
  motor[motorA] = 10;

}

      }
   }
}

Finally I got it done!!!!