12. Case 08: Run Along the Black Line#

12.1. Purpose#

../../_images/cutebot-pk-13.png

A codebase is required for Cutebot programming, click “Add Package” at the bottom of the drawer, search [Cutebot](https://www.elecfreaks.com/micro-bit-smart-cutebot.html) in the dialogue box and download it.

../../_images/cutebot-pk-111.png

Note: If you met a tip indicating incompatibility of the codebase, you can continue with the tips or build a new project there.

../../_images/case_01_022.png

Drag three if bricks into the Forever brick.
Judge if the status of line-tracking sensors is ○ ●, saying the left probe doesn’t detect the black line while the right probe detects the black line.
Set the left wheel speed to 50 and right to 25, make a right turn by the different speed of the two wheels and go back to the black line.
Judge if the status of line-tracking sensors is ● ○ and make a left turn to go back to the black line.
When the status is ● ● that means the Cutebot runs along with the black line at the speed of 50.

../../_images/case_08_011.png

You can also download it directly below:

The Cutebot runs along the black line and will adjust to run back to the black line if any deviation happens.

How to program to make the Cutebot run in the white background of the map excluding the black line circle part?