Thank! I know this small project is quite easy (specially thanks to the work and help from people like you!), but since I'm starting with Arduino, sensors and so on, I'm quite proud and I've learned a lot of things. About the project, one of my problems is the receiving range. I can't put a good antenna on the receiver (I know about the optimal length and now I've ordered one to see if I get better results).
In the meantime, I'm trying to do a TinyTx (following the tutorials from Nathan Chantrell). I have a raspberry and my final project would be to make it log data from several sensors around my home. Decoding the Oregon through the Raspberry may be cpu consuming, but with the TinyTx there are many solutions already available (like the RFM12Pi).