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<p>This study presents a low-cost, IoT-based security system to address the limitations of conventional systems by providing immediate physical deterrence and intelligent remote monitoring. Utilizing a Raspberry Pi Pico W microcontroller, the system integrates a Passive Infrared (PIR) motion sensor, Light Emitting Diode (LED), buzzer, and ultrasonic sensor. Its novelty lies in a selective data transmission protocol, where distance measurements are relayed to the Blynk IoT app only when an object is within a 1-meter proximity, conserving resources and focusing user attention on critical events. This integration offers a comprehensive and efficient security solution for Smart City environments, combining instant threat response with actionable, real-time data.</p>

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IoT based distance alarm system for enhancing security in smart cities

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年12月29日

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  • Gaurav Yadav,
  • Rahul Priyadarshi,
  • Dilip Kumar Yadav

摘要

This study presents a low-cost, IoT-based security system to address the limitations of conventional systems by providing immediate physical deterrence and intelligent remote monitoring. Utilizing a Raspberry Pi Pico W microcontroller, the system integrates a Passive Infrared (PIR) motion sensor, Light Emitting Diode (LED), buzzer, and ultrasonic sensor. Its novelty lies in a selective data transmission protocol, where distance measurements are relayed to the Blynk IoT app only when an object is within a 1-meter proximity, conserving resources and focusing user attention on critical events. This integration offers a comprehensive and efficient security solution for Smart City environments, combining instant threat response with actionable, real-time data.