HC12 modules here:
http://www.banggood.com/HC12433SI4...

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Exercise files temporary here:
https://drive.google.com/open?id=1QYG...

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Exercise files:
http://tomtomheylen.com/download_file...
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In this video you will learn how to communicate between Arduinos over a long distance up to 1.8km in open air.
The HC12 is a wireless serial port communication module that is very useful, extremely powerful and easy to use.

First you will learn how to make a wireless instant messenger with the least effort possible.
Then we will move on to light up an LED with a push button and then you will learn a few useful string functions and operations for serial communication.

The last part of the video is not necessary but you will learn how to use the HC12 module like a pro.
In this part you will learn how to enter the modules setup mode to change the baud rate, transmission distance and so on.
And finally you will learn how to connect an external SMA antenna.

Follow the rest of this video to find out how easy it is to become a pro in wireless serial communication.

2 x Arduino ( got my Arduino clones for 3 dollar here: http://www.banggood.com/UNOR3ATmega... )

2 x HC12 modules (got mine here: http://www.banggood.com/HC12433SI4... )