# Case 07: Smart Lamps 

## Introduction

Use the light intensity of the micro:bit to make a smart light, which automatically turns on or off the LED light according to the light level.

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

## Quick Start


### Materials Required

Nezha expansion board × 1

micro:bit × 1

LED-yellow × 1

RJ11 wires × 1

***Tips: You may need to purchase [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) if you want all the above compoents.***

### Connection Diagram

Connect the yellow LED on the Nezha expansion board as the picture shows.


![](./images/case_07_03.png)

### Assembly Video


Video reference: [https://youtu.be/oDzSJMKisO8](https://youtu.be/oDzSJMKisO8)

<iframe width="560" height="315" src="https://www.youtube.com/embed/oDzSJMKisO8" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>

### Assembly Steps

![](./images/case_step_07_01.png)

![](./images/case_step_07_02.png)

![](./images/case_step_07_03.png)

![](./images/case_step_07_04.png)

![](./images/case_step_07_05.png)

![](./images/case_step_07_06.png)

![](./images/case_step_07_07.png)



## MakeCode Programming



### Step 1

Click "Advanced" in the MakeCode to see more choices.

![](./images/case_01_10.png)

For programming, we need to add a package: click "Extensions" at the bottom of the MakeCode drawer and search with "PlanetX" in the dialogue box to download it. 

![](./images/case_01_11.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 below:

![](./images/case_07_10.png)


### Reference
Link：[https://makecode.microbit.org/_haMDD2EftPLV](https://makecode.microbit.org/_haMDD2EftPLV)

You may 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:_haMDD2EftPLV" frameborder="0" sandbox="allow-popups allow-forms allow-scripts allow-same-origin"></iframe></div>  


### Result

The LED lamps light on/off according to the light intensity.

![](./images/case-gif-07.gif)