In this instructable you will learn how to communicate between Arduinos over a long distance up to in open air.The is a wireless serial port communication module that is very useful, extremely powerful and easy to use.
Raspberry Pi: Does it Need Securing? #arduino ~~~ For more cool Arduino stuff check out http://arduinoprojecthacks.com
Picture of Arduino RGB LED Strip Controller
LoRaWAN module for Arduino, Waspmote and Raspberry Pi - Europe [XBee Socket]