  Security, defined as protection against external threats, is a critical
concern for homes and offices. Intrusion, characterized by unauthorized access,
presents a significant challenge to maintaining security. This research aims to
address this issue by designing and implementing an automated intrusion
detection system utilizing a combination of sensors and communication
technologies.
  The research introduced an automated intrusion detection system for homes and
offices, combining sensors such as a PIR sensor for detecting unauthorized
motion, magnetic switches for unauthorized entry detection, and a GSM module
for notifying property owners. Employing the ATmega328P microcontroller, sensor
data is analysed to generate early intrusion alerts, prompting phone call
notifications via the GSM module. Practical implementation involved
breadboarding, soldering, and rigorous testing, ensuring proper functionality
under real-world conditions. The implemented intrusion detection system
effectively utilizes magnetic switches and a Passive Infrared (PIR) sensor to
detect unauthorized entry and motion within the premises, respectively. Upon
detection, the system promptly analyses the situation and alerts the property
owner via phone call, enabling swift response measures. This real-time
notification system enhances proactive security management, minimizing the risk
of further intrusion and ensuring the safety of the property. The multi-sensor
intrusion detection system, incorporating PIR sensors, magnetic switches, and a
GSM-based phone call gateway, effectively alerts property owners of
unauthorized intrusions in real-time. Demonstrating its efficacy through
rigorous testing, the system offers enhanced security for both residential and
commercial environments.
