Abstract: In today’s world, safety and security of homes have become one of the primary concerns due to increasing incidents of theft, fire hazards, and environmental threats. To address this issue, our project proposes a smart Home Security and Automation System using Internet of Things (IoT) technology. The system integrates five sensors — PIR sensor for motion detection, MQ2 sensor for gas leakage detection, DHT11 sensor for temperature and humidity monitoring, Fire sensor for flame detection, and an Ultrasonic sensor for automatic water tank level detection and filling.

These sensors are connected to a microcontroller, which continuously monitors the surrounding environment. In the event of any abnormal activity such as intrusion, gas leakage, sudden fire, or critical temperature rise, the system immediately triggers an alert. The system is integrated with the Blynk IoT platform, which enables real-time notifications to be sent via email to the homeowner, ensuring instant awareness of the situation.

Additionally, the ultrasonic sensor automates the water filling process, thus reducing manual effort and ensuring water availability. This project not only enhances security bualso adds automation for convenience and energy efficiency. The system is lowcost, easy to install, and scalable for future improvements like AI-based detection and voicecontrolled automation. Hence, the proposed solution provides a reliable, userfriendly, and effective approach for securing homes while offering intelligent automation features.

Keywords: IOT, Home Automation, Security System, Smart Sensors, Blynk IOT

Downloads: | DOI: 10.17148/IARJSET.2025.121208