I'm Marc from Italy, this is my first post here. With some friends we're planning to develop a system that permits to communicate wirelessly between multiple devices, but we need some advice
This should be possible where no WiFi or GSM is available, so we were thinking of RF modules, the range should be able to reach around 1.5 - 2 Km, also trees and buildings on the way may not be excluded.
Another important feature of this project is to avoid interference, so some sort of unique device ID that let's communicate two groups of devices in a completely separate way, an example to clarify:
group1: id1, id2, id3 - should be able to chat between them, but not with a device of group2
group2: id4, id5, id6 - should be able to chat between them, but not with a device of group1
The device will only have a display to show incoming messages, but to write them we're thinking of using our smartphones, connected via usb or bluetooth to Arduino.
What kind of Arduino board and RF module do you suggest that will do for us?