Abstract: A real time machine for Intrusion detection & monitoring primarily based on wireless sensor network technology is designed by using the use of the mote that's developed & designed in as the communication module inside the network. This dissertation tells tool-free Passive Localization with RSSI. Primary objective of this dissertation is to layout D.F.P Localization that can be redeployable, reconfigurable, smooth to apply, & operates in actual time. The embedded intrusion detection algorithm is designed so that it may cope with the limited assets, in terms of computational energy & available memory area, of the microcontroller unit (MCU) determined inside the nodes & various demanding situations & problem confronted during the real check mattress deployment & additionally proposed solutions to conquer. We come up with an opportunity algorithm primarily work on minimum Euclidean distance classifier the output suggests that localization accuracy of the method is accelerated while usage of the proposed algorithm.