# case 07 Turns over Detection 

## Our Goal


- Make the car to stop when it turns over.

## Requiered Materials


- 1 x [Ring:bit Car](https://shop.elecfreaks.com/products/elecfreaks-micro-bit-ring-bit-v2-car-kit-without-micro-bit-board?_pos=4&_sid=66ba68dec&_ss=r)

## Hardware Connect

- Connect the left wheel servo to P1 of the Ring:bit expansion board and the right wheel servo to P2.

![](./images/jBVHea8.png)

## Software

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

## Coding

### Step 1
- Click on "Advanced" in the MakeCode Drawer to see more code sections.

![](./images/2qCyzQ7.png)

- Search for “ringbitcar” and click on the ring:bit car package to add it to your project. (As below picture)

![](./images/1Wq2Mov.jpg)

***Note：*** If you get a warning telling you some packages will be removed because of incompatibility issues, either follow the prompts or create a new project in the Project file menu.

### Step 2

- Snap the `on start` block from the Basic. Set RainbowLED with 24 leds in RGB format for colorful light and show rainbow from 1 to 360.
Then, initialize the P1 port to left wheel and the P2 port to right wheel.

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

### Step 3

- Set a variable to state for controlling car's running. Then set state variable unber the logo up block to true and the other to false.

![](./images/wjmku1o.png)

### Step 4

- Set the rainblw led to colorful lights under the `forever` loop in gradual change.
Use the variable state to control car's running.
![](./images/w8SjwwY.png)


### Program

Program Link：[https://makecode.microbit.org/_asoLxTRz4Dg2](https://makecode.microbit.org/_asoLxTRz4Dg2)

If you don't want to type these code by yourself, you can directly download the whole program from the link 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:_asoLxTRz4Dg2" frameborder="0" sandbox="allow-popups allow-forms allow-scripts allow-same-origin"></iframe></div>  


## Result


- The car runs normally，when it turns over, it stops.

![](./images/buZmNej.gif)

## Think


- How can you design more funny project using other kits?


## Questions



## More Information