36. case 35 Color Recognition Car#

36.1. Introduction#

A color recognition sensor is installed on the car. We can use the color recognition sensor to identify the color blocks that the car passes along the way and display it through the rainbow LED on the car.

../../_images/case_35_01.png

36.2. Quick Start#

Materials Required#

Nezha expansion board × 1

micro:bit V2 × 1

motors × 2

Color sensor × 1

Rainbow LED ring × 1

Bricks × N

Tips: You may need to purchase Nezha Inventor’s Kit and Purchase Interactive coding accessories pack here. if you want all the above components.

Connection Diagram#

Insert the micro:bit, connect the motors to M1and M4 , the color sensor to IIC port and the rainbow led ring to J1 on the Nezha expansion board as the picture shows.

../../_images/case_35_03.png

Assembly Video#

Link: https://youtu.be/2VBr3sEPMIg

Assembly Steps#

../../_images/case_step_35_01.png

../../_images/case_step_35_02.png

../../_images/case_step_35_03.png

../../_images/case_step_35_04.png

../../_images/case_step_35_05.png

../../_images/case_step_35_06.png

../../_images/case_step_35_07.png

../../_images/case_step_35_08.png

../../_images/case_step_35_09.png

../../_images/case_step_35_10.png

../../_images/case_step_35_11.png

../../_images/case_step_35_12.png

../../_images/case_step_35_13.png

../../_images/case_step_35_14.png

../../_images/case_step_35_15.png

../../_images/case_step_35_16.png

../../_images/case_step_35_17.png

../../_images/case_step_35_18.png

../../_images/case_step_35_19.png

../../_images/case_step_35_20.png

../../_images/case_step_35_21.png

../../_images/case_step_35_22.png

../../_images/case_step_35_23.png

../../_images/case_step_35_24.png

36.3. 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 “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_35_10.png

Reference#

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

You may also download it directly below:

Result#

After powering on, the lights on the car turn on with the color detected from the color sensor.

../../_images/case-gif-35.gif