# Case 10: Car Following with A Fixed Distance

## 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) moves with a fixed distance between the car and your hands.

## 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)
- 1 x Ultrasonic Sensor

## 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` 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

- Drag the "set left wheel speed and right wheel speed" into the `On start` brick.

![](./images/case_10_01.png)

### Step 3

- Set a `Sonar` variable to  save the detected `Cm` value in the `Forever` brick.
- If the detected value is between`5` and `10` , the car stops moving.
- If the detected value is below`5` , the car reverses because of the short distance with the hands.
- If not any, the car moves forward to catch up with the hands because of the far distance with the hands and then stay still .

![](./images/case_10_02.png)


### Programming

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

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/_YxxfyPVsmHjg" 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) adjusts itself to keep a fixed distance with your hands.

## Exploration
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## FAQ
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## Relevant Files
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