Nowadays, individuals are very concerned about safety. They feel that the environment today is no longer safe because of an increase in crime rates. Many people have installed security systems in their homes. There are a lot of security system had been used and the technology used is always up-to-date according to the latest invasions. Home security is essential for part for a safe home. This project aims in developing a low-cost and intelligent security system using passive IR sensor. Arduino UNO board which act as a microcontroller unit receives continuous data from PIR sensor and processes them. The Arduino will trigger an alarm and alert messages will be sent to user’s mobile via GSM in case of untoward situations. (PIR) detectors take advantage of pyro-electricity to detect a human body that is a constant source of infrared radiation. The main objective is to give protection for house by helping users to aware about intruders and to be notify through a Short Message Service (SMS) if there any invasion. Hence the device serves the purpose of safety and protection.