I'm pretty noob at electronics and Raspberry Pi. I'm pretty good at programming though (both ruby and python). I want to connect RF receiver to a Raspberry Pi, so that it can read signals from sensors like this one: Pet immune pir detector wireless 433MHz pir motion sensor for security alarm system
I'm unsure what kind of receiver/antenna I would need to connect to the Raspberry, in order to make it capable of receiving the signal around my house (say 20 meters or so). And secondly how to do it?
Anyone who knows some good material on the topic and who can give me some concrete examples of some receivers which would be capable of this?