This lesson will show you how to program the mBot Neo to follow a line. It will then show you how test your program on the mBot Neo.

The parts below are required to complete this lesson. Note that all parts are included in the mBot Neo kit that can be purchased on Amazon.

1. Assembled mBot Neo from Lesson 1
2. USB Cable
3. Line following paper
4. Styrofoam Blocks that are at least 5in tall and 2in thick

1. Connect the USB cable to the CyberPi on the mBot Neo and plug the cable into your computer
   
   

   This will charge up your mBot Neo while you create the program

2. Open the mBlock app on your computer
   
   

   You can download the mBlock app from mBlock Download if it isn't already installed

   

3. Click on the Extension button
   
   

   

4. Click the Add button under the mBot2 shield
   
   

   

5. Click on the Extension button
   
   

   

6. Click the Add button under the Quad RGB Sensor
   
   

   

7. Click on the Extension button
   
   

   

8. Click the Add button under the Ultrasonic Sensor 2
   
   

   

9. Click the Upload button under the Mode Switch section
   
   

   This allows you to write your program without having the mBot Neo connected to your computer

   

10. Perform steps 8 through 40 of Lesson 3
11. Drag the “if < > then else” block to the coding pane and snap in inside the top of the forever block
    
    

    

12. Click the Operators selector and drag the “( ) > 50” block to the coding pane and snap it into the if - then block
    
    

    

13. Click the Ultrasonic Sensor 2 selector and drag the “ultrasonic 2 1 distance to an object (cm)” block to the coding pane and snap it into the “( ) > 50” block
    
    

    

14. Change the “50” to “7” in the “( ) > 50” block
    
    

    

15. Click the mBot2 Chassis selector and drag the “turns left 90 until done” block to the coding pane and snap it inside the bottom section of the if-then-else block
    
    

    

16. Drag the “moves forward 100cm until done” block to the coding pane and snap it inside the bottom section of the if-then-else block
    
    

    

17. Change the 100 to 15 in the “moves forward 100cm until done” block
    
    

    

18. Drag the “turns left 90 until done” block to the coding pane and snap it inside the bottom section of the if-then-else block
    
    

    

19. Change the “left” to “right” in the “turns left 90 until done” block
    
    

    

20. Drag the “moves forward 100cm until done” block to the coding pane and snap it inside the bottom section of the if-then-else block
    
    

    

21. Change the 100 to 30 in the “moves forward 100cm until done” block
    
    

    

22. Drag the “turns left 90 until done” block to the coding pane and snap it inside the bottom section of the if-then-else block
    
    

    

23. Change the “left” to “right” in the “turns left 90 until done” block
    
    

    

24. Drag the “moves forward 100cm until done” block to the coding pane and snap it inside the bottom section of the if-then-else block
    
    

    

25. Change the 100 to 15 in the “moves forward 100cm until done” block
    
    

    

26. Drag the “turns left 90 until done” block to the coding pane and snap it inside the bottom section of the if-then-else block
    
    

    

27. Change the name of the program in the upper left to “ObstacleLineFollow”
    
    

    

28. Slide the power switch on the mBot2 Shield to the ON position and click the Connect button
    
    

    

29. Click the Upload button and wait for the upload to complete
    
    

    

30. Slide the power switch on the mCore mainboard on the mBot to the OFF position and disconnect the USB cable from the mBot Neo

Follow the steps below to test out the program you just created

1. Place the line following map on the floor
2. Place styrofoam blocks across the line to create obstacles
3. Place the mBot on the line and slide the power switch on the mBot2 Shield on the mBot Neo to the ON position
4. Press the B button on the CyberPi to start the mBot Neo moving
5. When you're finished watching the mBot Neo follow the line, press the A button
6. Change the distances in the else section to see how they change the mBot Neo obstacle avoidance

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