# Case 18: Music Box

## Introduction

This is a music box. We can control the buzzer on the micro:bit to emit different melody by pressing the button A on the micro:bit.



## Quick to Start


### Materials 

Nezha expansion board × 1

micro:bit × 1

***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) if you want all the above compoents.***

### Connection Diagram

Insert the micro:bit to Nezha expansion board. 


![](./images/case_18_03.png)



## MakeCode Programming




### Programme as the picture shows: 


![](./images/case_18_15.png)



### Link
Link: [https://makecode.microbit.org/_gRoDU7R96LTf](https://makecode.microbit.org/_gRoDU7R96LTf)

You may also downoad 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:_gRoDU7R96LTf" frameborder="0" sandbox="allow-popups allow-forms allow-scripts allow-same-origin"></iframe></div>  


### Result 
Press button A to switch the music.

![](./images/case-gif-18.gif)