RFM12B library
By Felix Rusu ([email protected])
Based on the RFM12 driver from jeelabs.com (2009-02-09 [email protected])
http://opensource.org/licenses/mit-license.php
Copy the content of this library in the "Arduino/libraries/RFM12B" folder.
To find your Arduino folder go to File>Preferences in the Arduino IDE.
See this tutorial on Arduino libraries.