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

Remove these adsRemove these ads by Signing Up

Step 1: The hardware

Picture of The hardware
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
Conor M3 months ago


lemorlenny2 years ago
Interesting project!,
You know how to generate QR pattern through arduino script?
bertus52x113 years ago
Although you state it's useless, it is great for other applications.
I like it!
derte84 (author)  bertus52x113 years ago
Any idea?
Advertisement or information that changes on a regular basis, like the weather forecast (when there is limited space).
derte84 (author)  bertus52x113 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-aniac3 years ago
Thanks! great nickname :)