Simple demo showing how to generate QR codes using Google's chart API and read them from a NAO behaviour
To generate a QR code run:
get-qr.py "<TEXT>" filename.png
The first parameter will be the text that is stored in the QR code if it contains whitespace then it must be enclosed in quotes.
To detect QR codes run the qr-code-test behaviour. NAO will read the text contained in the QR code the first time it sees it.
NAO Barcode reader docs: http://doc.aldebaran.com/2-1/naoqi/vision/albarcodereader.html#albarcodereader
Google QR code generation: https://developers.google.com/chart/infographics/docs/qr_codes#details