# Case 29: The Dazzling Car

## Introduction

This is a simple car. I installed a cool rainbow light ring on the car, and we can display different lighting effects through this light ring.

![](./images/case_29_01.png)

## 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](https://shop.elecfreaks.com/products/elecfreaks-micro-bit-nezha-48-in-1-inventors-kit-without-micro-bit-board?_pos=2&_sid=ed1b6fbd2&_ss=r) and [Purchase Interactive coding accessories pack here.](https://shop.elecfreaks.com/products/elecfreaks-interactive-coding-accessories-pack?_pos=1&_sid=c75dad35f&_ss=r) 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_29_03.png)



### Assembly Video


Link: [https://youtu.be/Am1ZEq1CqnY](https://youtu.be/Am1ZEq1CqnY)

<iframe width="560" height="315" src="https://www.youtube.com/embed/Am1ZEq1CqnY" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>


### Assembly Steps


![](./images/case_step_29_01.png)

![](./images/case_step_29_02.png)

![](./images/case_step_29_03.png)

![](./images/case_step_29_04.png)

![](./images/case_step_29_05.png)

![](./images/case_step_29_06.png)

![](./images/case_step_29_07.png)

![](./images/case_step_29_08.png)

![](./images/case_step_29_09.png)

![](./images/case_step_29_10.png)

![](./images/case_step_29_11.png)

![](./images/case_step_29_12.png)

![](./images/case_step_29_13.png)

![](./images/case_step_29_14.png)

![](./images/case_step_29_15.png)

![](./images/case_step_29_16.png)

![](./images/case_step_29_17.png)





## 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_29_10.png)



### Reference
Link: [https://makecode.microbit.org/_JtKg7ffF1YK7](https://makecode.microbit.org/_JtKg7ffF1YK7)

You may also download it directly below:

<div style="position:relative;height:0;padding-bottom:70%;overflow:hidden;"><iframe style="position:absolute;top:0;left:0;width:100%;height:100%;" src="https://makecode.microbit.org/#pub:_fzaisgJfKKKj" frameborder="0" sandbox="allow-popups allow-forms allow-scripts allow-same-origin"></iframe></div>  


### Result
After powering on, press button A to drive the car foward and the LEDs light up in red and blue, press button B to stop the car and the LEDs light off. 

![](./images/case-gif-29.gif)