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Automated security systems play an important role of providing an extra layer of security through user authentication to prevent break-ins at entry points and also to track illegal intrusions or unsolicited activities within the vicinity of the home (indoors and outdoors). There has been much research done in the design of various types of automated security systems. Sensor-based systems that rely on contact or movement sensors or contact-based systems such as fingerprint and palm print scan or keypad activation that require substantial amount of contact with an input device. Many security systems are based on only a single system. In an event of system failure or intrusion of the user authentication, there is no backup system to monitor the home continually. This shortcoming can be dealt with using multiple security systems (or multi-layered security systems).
The basic components of a home automation security system are motion detectors, LPG detectors and smoke detector. In this project we aim to overcome the flaws made by many other security devices as it is most effective in security purpose. It is cheaper and can be maintained easily than any other security device. This device works in two way modes.
a. Internal mode
b. External mode
When the internal mode is selected by the user when they are inside the wireless security area, the entire sensor except PIR sensor will be activated and the buzzer connected with the microcontroller will give an alarm and the reason for the insecurity will be displayed in the LCD connected to the microcontroller. In this mode, the electrical appliances in the security area automatically change to the manual mode in which user will control it.

When the external mode is selected by the user when they are outside the wireless security area, all the sensor will be active and the security area address which is pre-programmed, along with the problem will be sent as SMS to the specified police station, fire station, security room and also to the user at the time of insecurity, fire accident, unwanted movement of persons etc. which is sensed by the respective sensor. In this mode, the electrical appliances in the security area will automatically change to the automatic mode in which user will control it via SMS.

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