Hi, I am looking for wireless rf contacts that can be used for door and window sensors. I would like to monitor them with an rf receiver that would use the same frequency and message protocol. My concern is that any commercial products will use a proprietary format and may not be easily integrated into a breadboard project. ( I am not sure). I was planning on using a micro controller to decipher the message and determine alarm status. Has anyone tried this. I was hoping to find door and window sensors that can be purchased. As a brute force approach I was thinking of monitoring the siren voltage of a commercial system and then send out notification thru a PC, send email, call cellular, etc. Unfortunately this would not indicate which zone was breached. Any help on this matter is greatly appreciated.