anh_risn

Hi all, i'm started build wireless home alarm sensor that read several wireless PIR sensor attached on the doors. I found problem in deciding which wireless device should I use for simple task that is read alarm ON / OFF from wireless sensor. I have an idea about using wireless PIR sensor on the market today, so it could be easy installing on the door instead of make a new one. But I have no idea what kind of wireless device they are using, what protocol data they are using. Any help or idea would be appreciate. thanks