> For the complete documentation index, see [llms.txt](https://sharinghub-eng.kittenbot.hk/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://sharinghub-eng.kittenbot.hk/airelated/ai-camera-koi-2/makecode-programming/code-scanner.md).

# Code Scanner

### MakeCode Programming Tutorial

#### Extension link: [**https://github.com/KittenBot/pxt-koi2**](https://github.com/KittenBot/pxt-koi2)

Search for KOI2 in the search bar, select KOI 2.(KOI 2 has been approved by Microsoft)

<figure><img src="/files/Sw7BOOSrTSX5zHmVemsd" alt=""><figcaption></figcaption></figure>

The extension will be imported into your project.

### Coding Blocks

<figure><img src="/files/9ZGOyAlEA7k6HFcAklpG" alt=""><figcaption></figcaption></figure>

### Sample Program

{% hint style="info" %}
Armourbit users need to use the corresponding initialization block
{% endhint %}

<figure><img src="https://files.gitbook.com/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F6uJvpXC43onNIIwhMlWo%2Fuploads%2FPGyECwlPd2M3JqUBLDfO%2Fimage.png?alt=media&#x26;token=662ace3f-a8eb-4fbf-8a10-1d9643c88b1e" alt=""><figcaption></figcaption></figure>

{% embed url="<https://makecode.microbit.org/_Auhc1gdeRakV>" %}

[Sample Program](https://makecode.microbit.org/_Auhc1gdeRakV)

#### Sample Program Operations

1. Press Button A on the Micro:bit to scan a QR code, Micro:bit will display the results.
2. Press Button B on the Micro:bit to track a custom color line, aim the KOI at the color for calibration. Micro:bit will display the X1 coordinates of the tracked line.