1. Obstacle Detection

2. In the previous program the robot moves forward and then checks for something in the way. As we observed it only checks for things after it moves forward not all the time.

3. The robot should move if nothing is in the way and stop if there is checking constantly for obstacles.

4. Obstacle Detection Program Using a Switch Block

5. How the Ultrasonic Switch Block Works

7. The Sensor Value is greater than the switches compared value. The distance is above the threshold. The object is far from the robot.

8. How the Ultrasonic Switch Block Works The Sensor Value is less than the switches compared value. The distance is below the threshold. The object is near the robot.

9. Ultrasonic Sensor Block Details

10. Stop Motors Block Details

11. Move Forward Motor Block Details

12. Loop Block Details

13. Drag the Switch Block Into the Loop Block

14. Stop Motors After 4 Rotations

15. Test the robot to see if it keeps moving as long as nothing is in the way and stops if there is. Try placing the object in front of the robot at different times during the program to make sure the robot is checking constantly for obstacles.