Build a human firewall with Raspberry Pi

If you're getting tired of answering the front door - only to find unwanted visitors such as energy salespeople, then this project by Leonardo Sarra, Mattia Nicolella, and Andrea Fioraldi will be of great interest. 

They have devised a system that uses facial recognition to identify if someone is known to you or not when the doorbell button is pressed - with the results being sent to you via the Telegram app on a smartphone. 

The system uses a Raspberry Pi setup with a camera, and various software tools to allow you to train the system to identify people you do want to see - so unwanted visitors can be rejected. 

They've put together a quick demonstration in the following video:

To learn more about this awesome system, visit the creators' project page on hackster.io. 

If you're interested in making your own version, PMD Way offers Raspberry Pi products, cameras, and more to get you started.