<![CDATA[Enclosed spaces in ship engine rooms pose significant risks due to toxic gas accumulation like carbon monoxide and carbon dioxide, contributing to maritime fatalities. This research aimed to develop a Wemos D1-based prototype for real-time hazardous gas detection to enhance crew safety on MT Plaju tanker. Experimental prototype development employed ADDIE model with static and dynamic testing on MQ-135 sensor, buzzer, LED, and WiFi web monitoring. Population comprised four main holes (A-D) in engine room enclosed spaces, sampled through 20 measurements during 12-month sea practice. Instruments included Arduino IDE for programming and Excel for regression linear analysis with <5% calibration error. Results showed average CO detection at 5.4 ppm and CO2 at 406 ppm, with alarm response under 6 seconds exceeding 30% threshold, achieving 95% accuracy in high humidity and vibration conditions. The prototype demonstrated superior WiFi connectivity over previous ATMega328P systems, reducing hazard zones by 40%. In conclusion, this cost-effective IoT solution validates hardware reliability for Indonesian maritime operations, recommending multi-gas sensor integration for industrial scaling.]]>
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