# Case 14:  Guess the tones

## Introduction 

This is a gaming device. It displays a smiley face and plays a beep when it is turned on. Press the button A to select the corresponding number, and press the button B to confirm. If the confirmed number is the same as the prompt sound, the micro:bit displays √; if not, it displays ×.

![](./images/case_14_01.png)


## 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

Connect the micro:bit to Nezha expansion board as the picture shows. 


![](./images/case_14_03.png)



## MakeCode Programming 



### Step 1

Program to show icon in the on start brick and set the variable K as 0. 

![](./images/case_14_11.png)

In forever brick, set the variable j as true and the value of i as a random number among 1~7. 

![](./images/case_14_12.png)

If i=1, programme to play the tone of C; if i=2, set to play the tone of D, and set the following 5 tones accordingly in the same way. 

![](./images/case_14_13.png)

While the variable j is true, set k=k+1 after button A being pressed and display the value of K; while button B being pressed, if k=1, set to display √; if k≠i, set to display ×, and pause for 2000ms, then display the smile face; if k=0, set the variable of j as false. 


![](./images/case_14_14.png)


### Full Code: 

![](./images/case_14_15.png)

### Link

link: [https://makecode.microbit.org/_DK41ckRkTb4o](https://makecode.microbit.org/_DK41ckRkTb4o)

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:_DK41ckRkTb4o" frameborder="0" sandbox="allow-popups allow-forms allow-scripts allow-same-origin"></iframe></div>  

### Result

After powering on, it displays a smile face and plays a tone. Choose the equivalent numbers by pressing button A and confirm it by pressing button B. If the confirmed number and the tone are the same one,  the micro:bit displays √; if not, it displays ×. 

![](./images/case-gif-14.gif)