# Case 07: Fall-arrest Cutebot
## Purpose
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- The  [Cutebot](https://shop.elecfreaks.com/products/elecfreaks-micro-bit-smart-cutebot-kit-without-micro-bit-board?_pos=1&_sid=4c6909119&_ss=r) reverses quickly when detecting the edge of a table and goes forward after making a turn.

## Materials 
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- 1 x [Cutebot Kit](https://shop.elecfreaks.com/products/elecfreaks-micro-bit-smart-cutebot-kit-without-micro-bit-board?_pos=1&_sid=4c6909119&_ss=r)

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

## Programming
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### Step 1
- Click the "Advanced" to see more choices in the MakeCode drawer.

![](./images/cutebot-pk-1.png)

- A codebase is required for  [Cutebot](https://shop.elecfreaks.com/products/elecfreaks-micro-bit-smart-cutebot-kit-without-micro-bit-board?_pos=1&_sid=4c6909119&_ss=r) programming, click “Add Package” at the bottom of the drawer, search ` [Cutebot](https://shop.elecfreaks.com/products/elecfreaks-micro-bit-smart-cutebot-kit-without-micro-bit-board?_pos=1&_sid=4c6909119&_ss=r)` in the dialogue box and download it.

![](./images/cutebot-pk-11.png)

***Note:*** If you met a tip indicating incompatibility of the codebase, you can continue with the tips or build a new project there.

### Step 2

- Choose "show icon" in the `On start` brick.

![](./images/case_07_01.png)

### Step 3

- Drag `if` brick into `forever` brick and judge if both of the line-tracking sensors are detecting the edges of the black line, then set the right wheel speed to `20`. 
- If not, set the speed of both wheels as `-50` to reverse, pause `300ms` and keep the left wheel still but the right wheel moves at a random speed from 50~100 and lasts 100ms.
- Set the speed of both wheels to 0 and pause 1s to move forward again.

![](./images/case_07_02.png)

### Programming

Links: [https://makecode.microbit.org/_2z1hh4iEUgTY](https://makecode.microbit.org/_2z1hh4iEUgTY)

You can 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:https://makecode.microbit.org/_2z1hh4iEUgTY" frameborder="0" sandbox="allow-popups allow-forms allow-scripts allow-same-origin">
</iframe>
</div>  


## Result
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- The  [Cutebot](https://shop.elecfreaks.com/products/elecfreaks-micro-bit-smart-cutebot-kit-without-micro-bit-board?_pos=1&_sid=4c6909119&_ss=r) reverses quickly when detecting the edge of a table and goes forward after making a turn.

## Exploration
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## FAQ
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## Relevant Files
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