I found this http://www.ipenabled.com/md.html IP motion detection sensor together with other sensors such as Temperature, Temperature and Humidity, Water, Airflow, Security, AC Voltage, DC Voltage, Dry Contacts, Motion Detector, Smoke Detector, and more.
. Can linuxMCE handle this signal? I am not an expert, my idea is to connect to a switch/HUB different sensors to control my house.