# Page Not Found

The URL `files/6aDVnWUKjtKTsnad9GfU` does not exist. This page may have been moved, renamed, or deleted.

## Suggested Pages

You may be looking for one of the following:
- [Lesson 6. Digital Inputs](https://wiki.linhkientot.vn/arduino-products/arduino-starter-kit/lesson-6.-digital-inputs.md)
- [Lesson 9. Sensing Light](https://wiki.linhkientot.vn/arduino-products/arduino-starter-kit/lesson-9.-sensing-light.md)
- [Hướng dẫn ban đầu Arduino IDE](https://wiki.linhkientot.vn/arduino-products/huong-dan-ban-dau-arduino-ide.md)
- [Lập trình cảm biến khí ga/ khói MQ-2 Arduino](https://wiki.linhkientot.vn/arduino-products/lap-trinh-cam-bien-khi-ga-khoi-mq-2-arduino.md)
- [Lesson 8. Analog Inputs](https://wiki.linhkientot.vn/arduino-products/arduino-starter-kit/lesson-8.-analog-inputs.md)

## How to find the correct page

If the exact page cannot be found, you can still retrieve the information using the documentation query interface.

### Option 1 — Ask a question (recommended)

Perform an HTTP GET request on the documentation index with the `ask` parameter:

```
GET https://wiki.linhkientot.vn/arduino-products/arduino-starter-kit/lesson-6.-digital-inputs.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

### Option 2 — Browse the documentation index

Full index: https://wiki.linhkientot.vn/sitemap.md

Use this to discover valid page paths or navigate the documentation structure.

### Option 3 — Retrieve the full documentation corpus

Full export: https://wiki.linhkientot.vn/llms-full.txt

Use this to access all content at once and perform your own parsing or retrieval. It will be more expensive.

## Tips for requesting documentation

Prefer `.md` URLs for structured content, append `.md` to URLs (e.g., `/arduino-products/arduino-starter-kit/lesson-6.-digital-inputs.md`).

You may also use `Accept: text/markdown` header for content negotiation.