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Explained: Why do QR codes always have three corner squares? The engineering behind everyday scanning

Be it for buying a coffee, ordering food through a digital menu, or scanning a ticket – today, it is difficult to avoid encountering Quick Response (QR) codes in everyday life. Even though it seems ...
Hackaday

Read QR Codes Without A Computer

Did you ever watch Star Wars and wondered how people understood what R2D2 was saying? Maybe [Luke Skywalker] would enjoy learning to decode QR Codes by hand, too. While it might not be very practical, ...