# Case 38：The Mechanical Springtail

## Introduction
Build a mechanical springtail with the [Nezha Inventor's Kit](https://shop.elecfreaks.com/products/elecfreaks-micro-bit-nezha-48-in-1-inventors-kit-without-micro-bit-board?_pos=2&_sid=ed1b6fbd2&_ss=r). 

![](./images/neza-inventor-s-kit-case-38-01.png)

## Quick to Start

### Materials Required

[Nezha Inventor's Kit](https://shop.elecfreaks.com/products/elecfreaks-micro-bit-nezha-48-in-1-inventors-kit-without-micro-bit-board?_pos=2&_sid=ed1b6fbd2&_ss=r)

### Assembly

Components List

![](./images/neza-inventor-s-kit-case-38-02.png)

Build it as the assembly steps suggest: 

![](./images/neza-inventor-s-kit-step-38-01.png)

![](./images/neza-inventor-s-kit-step-38-02.png)

![](./images/neza-inventor-s-kit-step-38-03.png)

![](./images/neza-inventor-s-kit-step-38-04.png)

![](./images/neza-inventor-s-kit-step-38-05.png)

![](./images/neza-inventor-s-kit-step-38-06.png)

![](./images/neza-inventor-s-kit-step-38-07.png)

![](./images/neza-inventor-s-kit-step-38-08.png)

![](./images/neza-inventor-s-kit-step-38-09.png)

![](./images/neza-inventor-s-kit-step-38-10.png)

![](./images/neza-inventor-s-kit-step-38-11.png)

![](./images/neza-inventor-s-kit-step-38-12.png)

![](./images/neza-inventor-s-kit-step-38-13.png)

![](./images/neza-inventor-s-kit-step-38-14.png)

![](./images/neza-inventor-s-kit-step-38-15.png)

![](./images/neza-inventor-s-kit-step-38-16.png)

![](./images/neza-inventor-s-kit-step-38-17.png)

![](./images/neza-inventor-s-kit-step-38-18.png)

![](./images/neza-inventor-s-kit-step-38-19.png)

![](./images/neza-inventor-s-kit-step-38-20.png)

![](./images/neza-inventor-s-kit-step-38-21.png)

![](./images/neza-inventor-s-kit-step-38-22.png)


### Connection Diagram

Connect the [motor](https://shop.elecfreaks.com/products/elecfreaks-high-speed-building-blocks-motor?_pos=4&_sid=bfad50d7f&_ss=r) to M1 on [Nezha Breakout Board](https://shop.elecfreaks.com/products/elecfreaks-nezha-breakout-board?_pos=1&_sid=c41e367c3&_ss=r).

![](./images/neza-inventor-s-kit-case-38-03.png)


## MakeCode Programming



### Step 1
Click "Extensions''  in the MakeCode drawer to see more choices.



![](./images/neza-inventor-s-kit-case-37-04.png)

For programming [Nezha Breakout Board](https://shop.elecfreaks.com/products/elecfreaks-nezha-breakout-board?_pos=1&_sid=c41e367c3&_ss=r), we need to add a package. Search with "Nezha" in the dialogue box and click to download it. 

![](./images/neza-inventor-s-kit-case-37-06.png)

*Notice*: If you met a tip indicating that some codebases would be deleted due to incompatibility, you may continue as the tips say or create a new project in the menu. 

### Step 2

### Code as the picture suggests

![](./images/neza-inventor-s-kit-case-38-07.png)

### Reference

Link: [https://makecode.microbit.org/_iscUF8CzzYMd](https://makecode.microbit.org/_iscUF8CzzYMd)

You may also download it directly: 

<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:_LjaFs5Ji634D" frameborder="0" sandbox="allow-popups allow-forms allow-scripts allow-same-origin"></iframe></div>  
---

### Result
Press button A and the mechanical springtail crawls forward, press button B and the mechanical springtail stops moving.
![](./images/case_38.gif)


### Thinking

Why do we install tires on the mechanical springtail's arms, and what will happen if we don't?

### Activity
Modify your own mechanical springtail and hold races.