lesson-4.md

@@ -44,6 +44,10 @@ As an application of the BlackWhiteSensor try the program *LineFollowerCal.java*
 
 #### Execution ####
 
+We installed the *LineFollowerCal.java* <<<<<<ref!!!>>>>> application on the robot. Initially, we had some issues making the robot follow a black line. We found that this issue was fixable by holding the robot on top of the black line a bit before allowing the robot to drive and by placing it exactly on the black line instead of close to the black/white edge.
+
+After taking this approach, the robot ran as expected and followed the line. The movement was however a bit jagged due to the reactive nature of the application, which will be covered in depth in section <<<indsæt ref til sektion om PID line follower>>>>.
+
 ### ThreeColorSensor with Calibration ###
 
 #### Description ####