QR codes, I printed a bunch on shipping label paper and stuck them on the walls near light switches, the entrance, etc. You can also do them with NFC readers for phones but that's more expensive and you need an NFC writer.
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QR codes, I printed a bunch on shipping label paper and stuck them on the walls near light switches, the entrance, etc. You can also do them with NFC readers for phones but that's more expensive and you need an NFC writer.
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