Using a Raspberry Pi and a touch screen, the system generates a new passcode every day and when someone wants access to the network, they just need to scan a QR code.

As you can see from the photo above Chris has used a little Lego together with a Raspberry Pi 3 Model B and its accompanying Pi camera module, to create a system that reads QR codes printed on cards.

Working with a Raspberry Pi 3 Model B and a cheap camera, [Campbell] whipped up some code to handle producing and reading the QR codes — though he’s running the media server on another ...

At this point, you’re likely aware that you can store your wireless network’s credentials in a QR code, so that anyone who wants to connect with their smartphone need only scan the 2D barcode ...