QR Codes

A QR code is a set of black small squares placed on a big white square, in different ways, with three bigger squares at corners avoove and on the left. They are like an evolution of bar codes, but anybody can scan them with an smartphone and the appropiate application. They read information which can be a link to a webpage, a small text, an image...

This codes came from the car brand Denso Wave, from Toyota. They used them to mark their differents pieces to storage them (1994).

Their capacity is varialble because there are differents types of QR codes. But the normal capacity is 2953 MByte or 7089 numeric characters as maximum.