# Page Not Found

The URL `hw/arduino` does not exist.

You might be looking for one of these pages:
- [arduino](https://book.ferro.pro/elec/arduino.md)
- [x86_intel](https://book.ferro.pro/hw/x86_intel.md)
- [GPU](https://book.ferro.pro/hw/gpu.md)
- [PCI](https://book.ferro.pro/hw/pci.md)
- [ent](https://book.ferro.pro/hw/ent.md)

## How to find the correct page

1. **Browse the full index**: [/sitemap.md](https://book.ferro.pro/sitemap.md) - Complete documentation index
2. **View the full content**: [/llms-full.txt](https://book.ferro.pro/llms-full.txt) - Full content export

## Tips for requesting documentation

- For markdown responses, append `.md` to URLs (e.g., `/elec/arduino.md`)
- Use `Accept: text/markdown` header for content negotiation