What is a QR code?

A QR code is a picture or diagram we can use for encoding text in a general way. Apparently we dont know what is it. But if I show you some examples, I´m sure you´ll recognize it inmediatly

Yes, this picture means wikipedia.org

What is the origin of this code?

The QR code system was invented in 1994 by Denso Wave. Its purpose was to track vehicles during manufacture; it was designed to allow high-speed component scanning.[3] Although initially used for tracking parts in vehicle manufacturing, QR codes now are used in a much broader context, including both commercial tracking applications and convenience-oriented applications aimed at mobile-phone users (termed mobile tagging). QR codes may be used to display text to the user, to add a vCard contact to the user's device, to open a Uniform Resource Identifier (URI), or to compose an e-mail or text message. Users can generate and print their own QR codes for others to scan and use by visiting one of several paid and free QR code generating sites or apps. The technology has since become one of the most-used types of two-dimensional barcode

We can see this information through this picture

How can we create a qr code?

There are several ways of create a new one. For instance we will choose the following free website:

http://www.qrcode.es/es/generador-qr-code/

The only thing we have to do is to write the text we want to encode and click on the text:

Here we do a practice:

• Create the qr code of your school website
• Create the qr code of your name

Time for scanning...

With a webcam or smarthphone or tablet we can easily check a qr code.

• If we choose our computer or laptop there are several websites for this purpose too. We have chosen the next one:

https://webqr.com/

The web ask us if we want to allow access to our wecam. We choose YES, and we put in front of the webcam the picture of the qr code we want to check or scan

• By the other hand, if we choose our smartphone, we look for an app in the play store called QR droid