# Case 03: Color-controlled Piano

## Purpose

To make the Nezha expansion board be able to play the different sounds according to the recognized color from the AI Lens. 

![](./images/05035_01.png)

## Products Link

[ELECFREAKS Smart AI Lens Kit](https://shop.elecfreaks.com/products/elecfreaks-smart-ai-lens-kit?_pos=1&_sid=d572dc26c&_ss=r)

[ELECFREAKS Nezha Breakout Board](https://shop.elecfreaks.com/products/elecfreaks-nezha-breakout-board?_pos=1&_sid=327dd9f18&_ss=r)

### Materials Required and Connection Diagram


 Connect the AI Lens to the IIC port on the Nezha expansion board as the picture shows. 


![](./images/05035_01_03.png)



## MakeCode Programming 


### Step 1

Click "Advanced" in the MakeCode drawer to see more choices. 

![](./images/05001_04.png)

We need to add a package for programming. Click "Extensions" in the bottom of the drawer and search with "PlanetX" in the dialogue box to download it. 

![](./images/05001_05.png)

***Note:*** If you met a tip indicating that the codebase will be deleted due to incompatibility, you may continue as the tips say or build a new project in the menu. 

### Step 2

### Code as below:

![](./images/05035_03_06.png)


### Link
Link: [https://makecode.microbit.org/_X1T8VDgbU3Xv](https://makecode.microbit.org/_X1T8VDgbU3Xv)

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:_X1T8VDgbU3Xv" frameborder="0" sandbox="allow-popups allow-forms allow-scripts allow-same-origin"></iframe></div>  


### Result
 The buzzer on the Nezha expansion board plays different sounds aoccording to the different color recoginzed by the AI Lens.