Room Safety Monitoring Using a Temperature Sensor Alarm System

This study developed an affordable room safety monitoring system designed to address the critical lack of low-cost tools for detecting hazardous temperature fluctuations in residential and educational environments. Recognizing that commercial safety systems are often cost-prohibitive for average households and local schools, this research aimed to engineer a prototype using accessible, off-the-shelf components. The system utilizes an Arduino UNO microcontroller as its central processing unit, integrated with a high-precision LM35 temperature sensor to provide continuous, real-time environmental monitoring. The technical architecture is programmed to maintain a specific "safe zone" through a constant feedback loop. When the device detects environmental conditions that deviate from these pre-defined parameters, it triggers a multi-modal alert system designed to ensure immediate human intervention. This includes an auditory alarm via a piezoelectric buzzer, a high-visibility red LED, and a 16×2 LCD screen that displays live temperature data and status updates. Methodological testing was conducted using controlled heat and cold sources to establish the threshold reliability of the prototype. The results verified that the alarm system consistently and reliably activates when temperatures exceed 41°C or drop below 15°C, maintaining a low margin of error across multiple trials. These findings demonstrate that the prototype is a highly responsive and practical solution for mitigating fire hazards, preventing heat-related illness, and monitoring machinery for potential overheating. Ultimately, this research bridges the gap between high-end industrial safety equipment and community needs, providing a reliable, user-friendly, and cost-effective tool that makes essential safety technology accessible to the general public.