# Case 09: Seeking light

## Purpose
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- Programme to set the TPBot heading to the light. 

## 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
- Set the headlights in white in the on start brick. 
- Judge if the light intensity is over the set point in the forever brick, if yes, set the TPBot moving forward; or it goes around in circles. 

![](./images/TPBot_tianpeng_case_09_04.png)

### Link
- Link: [https://makecode.microbit.org/_by81v67kf8Ef](https://makecode.microbit.org/_by81v67kf8Ef)

- 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:_by81v67kf8Ef" frameborder="0" sandbox="allow-popups allow-forms allow-scripts allow-same-origin"></iframe></div>  


### Conclusion

- Power up to set the TPBot going around in circles or moving forward if the detected light intensity is over the set point. 

## 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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