Development and Analysis of an IoT Security Alarm System Leveraging GSM Communication Networks

In this paper, a versatile safety and security system is introduced that brings together intrusion, fire, water and gas leakage, environmental, and emergency monitoring in one platform. The setup uses a range of detectors, including Passive Infrared (PIR) motion sensors, magnetic door/window contacts, smoke and heat sensors, gas and water detectors, glass break sensors, and even an SOS emergency feature. Unlike typical systems, it maintains 4G/3G networks and automatically switches to 2G for SMS and call alerts when network signals are weak. The system also allows real-time location tracking and cloud-based control through mobile apps like Blynk or web dashboards that making remote monitoring possible. When any abnormality is detected, SMS alerts are send to three pre-set numbers. If they go unacknowledged, the system places sequential calls until the alert is confirmed and resolved. Integration with fire alarm control panels, electrical fences, and CCTV systems is implemented, extending the system’s functionality. The system is supported by a dual backup of solar power and the electrical grid. This dual system remains reliable and operates effectively in both urban and rural areas.