Dude! that is awesome! - If the NFC ends up being too prohibitive, might consider bar codes or QR codes. Might be another option, if you find NFC becoming problematic. Cool idea - I'm looking forward to following it.
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Thank you! So far they haven't been a problem, but I'll definitely keep that in mind if I do have problems with them. I recall looking at using QR codes as well but couldn't find any readers, only those very big ones that are pretty expensive.