• 2026-05-08
• J.O. Adeogo
• Volume 2, Issue 1

Abstract

This work focuses on the design and implementation of a motion-activated security alarm system for burglary prevention. The growing rate of theft and intrusion in homes and offices has made it essential to develop affordable and reliable electronic systems for security enhancement. The system detects human motion using a Passive Infrared (PIR) sensor and automatically triggers both visual and auditory alarms to alert occupants of any intrusion. The materials used in the development include a PIR sensor, a piezoelectric buzzer, an LED indicator, a resistor, a toggle switch, and a regulated 9V DC power supply. The PIR sensor served as the primary motion detection unit, while the buzzer and LED provided sound and light indications respectively. The system was tested experimentally to evaluate its sensitivity, response time, and detection range under different conditions. The results showed that the PIR sensor efficiently detected motion within a range of 0.5 to 1.5 meters, with response times varying from 0.5 seconds at closer distances to about 2.0 seconds at longer ranges. The developed alarm system proved to be a low cost, energy-efficient, and dependable device suitable for both residential and small business environments.