See if you can move a boat in front of the light sensor while the program is running..
http://netapps.marshall.edu/lego/SENSORSCITY/DataChallenge.html
- See Instructions-
The directory with Example programs to use at SENSORSCITY are on
 http://SENSORSCITY.marshall.edu/CITY/pages/vi/
 Click and save a file that ends in .vi to your computer to use to send a mission.
The RoboLab Programs are the files that end in .vi and the .jpg are pictures of the programs.
 Note:   A boat goes between the Lamp on port A which is across from the light sensor on port 1.
 Monorail motor is on port B and touch sensors on both ends of the track are on port 2.
Port C changes each month.
Port 3 is a light sensor facing the Circle.
 

You will get data back.
The green line dips at each time the boat passes in front of  light sensor on port 3.
The red line steps up each time the touch sensor at an end of the monorail was touched.
The white line is the data back from the reflection from the boat on the circle.

Look at the camera
http://legocamera.marshall.edu
and use http://lego.marshall.edu
then look at your data to see if you are right.