15. Case 11: Line-tracking Car#

15.1. Introduction#

This is a line tracking car, we can use black electrical tape to paste a track on the white plane, and then make the car drive according to the preset trajectory.

../../_images/case_11_01.png

15.2. Quick Start#

Materials Required#

Nezha expansion board × 1

micro:bit × 1

Line-tracking sensor × 1

Motors × 2

RJ11 wires × 1

Tips: You may need to purchase Nezha Inventor’s Kit if you want all the above compoents.

Connection Diagram#

Connect the line-tracking sensor to J1, the two motors to M1&M4 on the Nezha expansion board as the picture shows.

../../_images/case11-04.png

Assembly Steps#

../../_images/case_step_11_01.png

../../_images/case_step_11_02.png

../../_images/case_step_11_03.png

../../_images/case_step_11_04.png

../../_images/case_step_11_05.png

../../_images/case_step_11_06.png

../../_images/case_step_11_07.png

../../_images/case_step_11_08.png

../../_images/case_step_11_09.png

../../_images/case_step_11_10.png

../../_images/case_step_11_11.png

../../_images/case_step_11_12.png

../../_images/case_step_11_13.png

../../_images/case_step_11_14.png

../../_images/case_step_11_15.png

../../_images/case_step_11_16.png

../../_images/case_step_11_17.png

../../_images/case_step_11_18.png

../../_images/case_step_11_19.png

../../_images/case_step_11_20.png

../../_images/case_step_11_21.png

15.3. MakeCode Programming#

Step 1#

Click “Advanced” in the MakeCode to see more choices.

../../_images/case_01_10.png

For programming, we need to add a package: click “Extensions” at the bottom of the MakeCode drawer and search with “PlanetX” in the dialogue box to download it.

../../_images/case_01_11.png

For programming, we need to add a package: click “Extensions” at the bottom of the MakeCode drawer and search with “nezha” in the dialogue box to download it.

../../_images/case_03_09.png

Notice: If you met a tip indicating that some codebases would be deleted due to incompatibility, you may continue as the tips say or create a new project in the menu.

Step 2#

Code as below:#

../../_images/case_11_15.png

Reference#

Link:https://makecode.microbit.org/_MbaX4mTEmHmf

You may also download it directly below:

Result#

The car drives along with the black line.

../../_images/case-gif-11.gif