# Case 03: Line Tracking 

## Purpose
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- Programme to set the TPBot driving along with the black line. 

## Material
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- 1 x [TPBot](https://shop.elecfreaks.com/products/elecfreaks-micro-bit-tpbot-car-kit-without-micro-bit-board?_pos=1&_sid=f32828112&_ss=r)



![](./images/TPBot_tianpeng_case_01_01.png)





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


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

![](./images/TPBot_tianpeng_case_01_02.png)

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

![](./images/TPBot_tianpeng_case_01_03.png)

### Sample
- Judge the status of the line-tracking sensors: if the black was detected on the left, set the speed of the left wheel in 0 and the right in 40; if the black was detected on the right, set the speed of the left wheel in 40 and the right in 0. 


![](./images/TPBot_tianpeng_case_03_04.png)

### Link
- Link: [https://makecode.microbit.org/_4WML7wLL5DDJ](https://makecode.microbit.org/_4WML7wLL5DDJ)

- 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:_4WML7wLL5DDJ" frameborder="0" sandbox="allow-popups allow-forms allow-scripts allow-same-origin"></iframe></div>  


### Conclusion


- TPBot drives along with the balck line. 


## Exploration
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## FAQ
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Q: The car does not work with the code in the wiki.     
A: It should be the batteries that are lack of power, please try to fix it by adding the value of the speed in the code. 

## Relevant File
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