What can I do with my old Raspberry Pi?
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			What to do with your old Pi after the Raspberry Pi 4 is released?
 - 1 Try another Smart Home system.
 - 2 Reinstall it as a Smart Home System for a friend or family member.
 - 3 Turn your old Raspberry in a retro-gaming machine.
 - 4 Turn it into a Media Center.
 - 5 Turn it into a NAS.
 
Furthermore, what can you build with a Raspberry Pi?
Top 20 Best Raspberry Pi Projects That You Can Start Right Now
- Weather Station with Raspberry Pi.
 - Make a Pi Twitter Bot.
 - Wireless Print Server.
 - FM Radio Station.
 - Build a TOR router.
 - Raspberry Pi NAS File Server.
 - Network Monitoring Tool.
 - Minecraft Game Server.
 
- Low cost (~35$)
 - Huge processing power in a compact board.
 - Many interfaces (HDMI, multiple USB, Ethernet, onboard Wi-Fi and Bluetooth, many GPIOs, USB powered, etc.)
 - Supports Linux, Python (making it easy to build applications)
 
Also question is, what can Raspberry Pi 4 do?
The Raspberry Pi 4 can do a surprising amount. Amateur tech enthusiasts use Pi boards as media centers, file servers, retro games consoles, routers, and network-level ad-blockers, for starters. However that is just a taste of what's possible.
A fresh install of Windows 10 on the Raspberry Pi doesn't boot to the familiar Windows desktop. Instead, Windows 10 IoT Core will show users a single full-screen Universal Windows app. The system will only display the interface of a single app at a time, although additional software can be run in the background.