I'm pretty sure I remember someone showing me a tool they were using to generate QR codes for individual contacts on their Android.
How do I generate a QR code for a contact?
Android Enthusiasts Stack Exchange is a question and answer site for enthusiasts and power users of the Android operating system. It only takes a minute to sign up.Sign up to join this community
Use the popular Barcode Scanner App, it gives you a "share via barcode" option in the "share" menu when viewing a contact.