Dual-Sensing Alert System for High-Security Zones (Motion & Sound-Based)

Abstract

High-security areas such as military bases, research laboratories, and critical infrastructures require reliable surveillance systems to prevent unauthorized intrusions. Traditional security systems based on single sensors often suffer from high false alarm rates and limited environmental adaptability. This paper proposes a dual-sensing alert system that combines a PIR motion sensor and an LM393 sound sensor connected to an ESP32 microcontroller.The system processes real-time data from both sensors and triggers alerts only when suspicious motion and abnormal sound events occur simultaneously. This dual-validation approach significantly reduces false alarms and improves detection reliability. The system activates multiple alert mechanisms including LEDs, buzzers, LCD displays, and relays for sirens or floodlights. The proposed system is low cost, energy efficient, and scalable, making it suitable for deployment in high-security environments. The modular architecture also allows future integration with IoT platforms and remote monitoring systems.