Wednesday, November 30, 2011

QR codes are popping up all over!

Oh man, this post is long overdue. I started it years ago in November of 2010, when I saw my first QR code on a billboard in the Denver airport. At this point, I had seen QR codes on my United mobile boarding passes for a while, but this was the first time I saw one of the codes "out in the wild," so to speak.

Soon, I was seeing them everywhere! Bus stops, actual buses, catalogs, advertisements, even on a sticker on a bike rack outside the local Chipotle.

Then, in April 2011, Chicago CBS shared a QR code story and Richard Byrnes (Free Technology for Teachers) wrote an awesome post on QR codes. Heck, by April, even my mom knew what a QR code was! :) Researchers even had developed a QR code-based vending machine that accepts PayPal. I realized it was time to go back and dig out my notes.


And I finally did it. I got a QR code app. I checked out this Feb 18, 2011 blog post describing 5 of the current iPhone apps for scanning QR codes and bar codes. I decided on Scan. The first thing I did was use it to access the NSTA mobile site for the 2011 national conference in SF. (The second thing I did was scan that (unlabeled) sticker on that bike rack. It was some ad about smoking cessation.)

I've learned that QR stands for "Quick Response" and has been around since 1994. QR codes were originally created by a company called the Denso Corporation and these 2D bar codes have been popular in Japan for some time. (see 2007 blog post, 2009 blog post)

How do they work?

Well, if you have some time, read the Wikipedia article on this one. Or this blog has more specific information on the QR code design process.

Image CC by Zephyris.

There are a few parts I can figure out:
  • The three large squares (4.1) are the position markers. These tell the scanner where the edges of the code are.
  • Then there is one (or more) smaller alignment squares (4.2), to make sure everything is in line.
  • The dotted lines (4.3) are called "timing patterns" and define something about the position of the rows and columns.
  • The pink section determines the format (2) - is it a website? a text message? Numbers? Letters? Chinese characters? A combination?

Want to generate your own QR code?

There are many, many options to create your own QR codes. In Sept 2010, TechCrunch wrote a post about Google's new URL shortener. Apparently, if you simply add “.qr” to the end of any URL, it will create a QR code. Scanning this with any QR code reader will take you to the URL. Then in October, released it's own version of Google's little trick. Just add “.qr” to the end of any link (including custom URL's) to generate a QR code.

This summer, while I was cavorting around in Alaska, I learned that you can create QR codes with an image in the center! One of the resident techies aboard the ship recommended BeQRious as a reliable site to try this.

I like the simplicity of this site. In fact, I used it to make the QR code on the back of my new business cards. :)

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