# case 04:Timer

## Our Goal  
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- Use our watch kit to create a wearable timer.  

## Material   
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- 1 x Watch kit


## Hardware Connection  
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Assemble our watch kit directly just like the picture below.  

![](./images/vOZpBF4.jpg)  


## Software  
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[Microsoft Makecode](https://makecode.microbit.org/#)  


## Programming  
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### Step 1  

- When start our program, create a variable `flag` and set its value to 0. When button A is pressed, delay time for 5 second. When button B is pressed, set the value of variable `flag` to 1.  

![](./images/cP4zcvV.png)

### Step 2

- Create a `forever` loop and place an if statement under it. When the variable `flag` equals to 1, then activate the function. 
- Set time delay and play the built-in music `nyan` for once. Then set the variable `flag` to 0.

![](./images/lcr6uOP.png)  


### Program  
- Link of the whole program: [https://makecode.microbit.org/_35iVK1WVe8ms](https://makecode.microbit.org/_35iVK1WVe8ms)

- You can also download the program from the page 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:_35iVK1WVe8ms" frameborder="0" sandbox="allow-popups allow-forms allow-scripts allow-same-origin"></iframe></div>  


## Result  
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- The watch can keep time precisely and play music.  


## Think  
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## FAQ  
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## Relative Readings  
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