# Case 02: Speed Up Gradually

## Purpose
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- In case 01, we can find the  [Cutebot](https://shop.elecfreaks.com/products/elecfreaks-micro-bit-smart-cutebot-kit-without-micro-bit-board?_pos=1&_sid=4c6909119&_ss=r) moves too fast to go steadily(the universal wheel goes off the ground) at the beginning.
- We will learn to gradually speed up the car for a steady move at the beginning in this case.

## 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` 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.
- Set the `speed` variable to 0 which means the on start speed is 0.
![](./images/case_02_01.png)

### Step 3

- Drag setting speed bricks for left and right wheel and set the value as `speed` in "forever" brick, then add one to `speed`.
- If `speed` is `100` which is the maximum speed, set `speed` to 0 and restart it.

![](./images/case_02_02.png)

### Programming

Links: [https://makecode.microbit.org/_Au3Ji6KF0H6E](https://makecode.microbit.org/_Au3Ji6KF0H6E)

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/_Au3Ji6KF0H6E" 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) speeds up gradually and the universal wheel will not go off the ground due to the high speed.

## Exploration
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- How to program to make the car speed up gradually and then speed down gradually?

## FAQ
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## Relevant Files
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