<![CDATA[Maintaining fuel availability in generator set (genset) tanks is crucial for ensuring a continuous backup power supply at Kuala Pembuang Airport. This ensures that the generator can start immediately in the event of a main power outage. Currently, fuel level checks are performed manually—a process that is time-consuming and labor-intensive—potentially leading to delays in identifying fuel status. This study aims to design a real-time fuel level monitoring prototype based on microcontroller and Internet of Things (IoT) technologies. The Research and Development (R&D) method is employed, though the implementation is limited to six stages: identifying potential and problems, data collection, product design, design validation, design revision, and finalized design. The monitoring system utilizes components such as the HC-SR04 ultrasonic sensor, ESP32, and a 16×2 LCD, with the Blynk platform serving as the medium for remote monitoring. Test results across a volume range of 0–800 mL indicate an average error of 7.19% and an accuracy rate of 92.81%. The system is capable of displaying real-time data on five Android devices and issuing notifications when the fuel level drops below the minimum threshold. Based on these results, the prototype facilitates effective, practical, rapid, and measurable monitoring of fuel levels in generator tanks. Consequently, its implementation in the field would simplify the task for technicians in monitoring fuel levels and tank filling activities.]]>
