Lesson-3.markdown

@@ -32,10 +32,13 @@ At time = 28 a high peak is detected. This was caused by a nearby group making a
 
 
 ### Exercise 3
-The SoundCtrCar.java program have four states. Whenever a loud sound is recorded, the state will be change. 
-As it is shown in the video below, the four states are driving forward, turning right, turning left and stopping.
+The SoundCtrCar.java program has four states. Whenever a loud sound is recorded, the state changes. 
+As it is shown in the video below, the four states are driving forward, turning right, turning left and stopping in that order.
 
-TBD: Add video.
+[![Controlling the car with claps](http://img.youtube.com/vi/4ZlUZsZn74Y/0.jpg)](http://www.youtube.com/watch?v=4ZlUZsZn74Y)
+
+We noticed whilst doing the exercise that it was important to clap right in front of the sensor. 
+As the clap is recognized as a loud sound, if we didn't clap close enough, the sound would be to weak and not recognized as a clap. 
 
 ### Exercise 4
 TBD: Add codesnippet of ButtonListener implementation