Instructables
Picture of An arduino-based QR-code clock

I got this idea for a while but I never had the chance to try it out. Friday, a workmate gave me a LCD shield for Arduino and I thought that was the right time to build a clock that comunicate the time through QR-codes. Of course, it's extremely useless (as most of the clocks nowadays).

In the video below you can see the clock booting up and loading 3 different qr-codes (3 minutes)

As all my ideas, it is first sketched on my blog and, as soon as I got time, is realized and published here.
So, if you want to have an insight on my future project have a look at genteautoreggente.com

Step 1: The hardware

Picture of The hardware
Color_LCD.jpg
In order to build a QR-clock you need: Actually you can substitute my LCD shield with wathever LCD shield you have. You will need to adapt the code using the libraries of your shield. 

Step 2: The software

In order to make the clock to work we need some software on the pc and some on the arduino. All the needed code is in the 3 zip files attached to this step.
  • On the pc a python script will check every minute the time, search in the img folder the right QR-code that represent the time and send the pixel trough the serial line.
  • If you want to change the format of the qr-codes shown you can use the bash script to re-download the images (for example I use 24h time format. You could prefer the 12h one). I use google infographic service to produce the qr-codes. It's super fast and doesn't ban my IP also after a lot of requests.
  • On the Arduino, the code will wait for data on the serial line and draw the received data on the LCD shield
 
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lemorlenny2 years ago
Interesting project!,
You know how to generate QR pattern through arduino script?
bertus52x112 years ago
Although you state it's useless, it is great for other applications.
I like it!
derte84 (author)  bertus52x112 years ago
Any idea?
Advertisement or information that changes on a regular basis, like the weather forecast (when there is limited space).
derte84 (author)  bertus52x112 years ago
Nice idea, you can use some space ON the qr-code to render a meteo icon (http://hackaday.com/2011/08/11/how-to-put-your-logo-in-a-qr-code/).

Another nice thing you can do is to preload the images into an sd card so that you can disconnect from the computer.
Great idea.
derte84 (author)  Awesome-aniac2 years ago
Thanks! great nickname :)