Smart Alarm System for Record Rooms Using IC 555 and PIR Sensor

Authors: Sherley Suzane Tremot

DOI: https://doi.org/10.37082/IJIRMPS.v13.i6.232870

Short DOI: https://doi.org/hbg6mb

Country: India

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Abstract: Record rooms often contain confidential and critical data that require secure, tamper-proof environments. Traditional alarm systems lack the ability to automatically deactivate af-ter a fixed time interval, leading to unnecessary power usage and alert fatigue. This project presents a smart alarm system utilizing a monostable timer circuit built around the IC 555. It integrates a PIR (Passive Infrared) sensor for motion detection and a relay-driven output me-chanism that activates visual and audible alarms for a predetermined duration (11 seconds). The system ensures that unauthorized access is immediately detected and signaled without requiring manual reset.

Keywords: IC 555 Timer, PIR Sensor, Relay, Security System, Record Room Monitoring

Paper Id: 232870

Published On: 2025-12-27

Published In: Volume 13, Issue 6, November-December 2025

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