Abstract: In recent years, technology has advanced at a breakneck pace, making human existence simpler in a variety of ways. The Internet of Things is widely employed in daily objects, and its popularity is growing by the day. The design and implementation of an IoT and mobile-based vehicle fuel / tank level activities such as real-time fuel/water monitoring are covered in this article. Capacitance is used in the suggested IoT gadget to measure the amount of fuel/water. The driver receives a notification through mobile application when the vehicle's fuel/water reaches a specified level. A capacitive sensor for detecting water level has been created. As can be seen from the impedance (reactance) equation for a capacitor, it often has a high-impedance sensor, especially at low frequencies. In addition, in most cases, a capacitive sensor is a non-contacting device . In this study, copper plates were used to produce a capacitive fuel/water level sensor. The fuel/water level determines the dielectric constant between two plates. As a result, because it is inversely proportional to sensor impedance, it may be utilised to calculate fuel/water level from electrical characteristics. Signal conditioning for the system includes linearization, inverting amplifiers, and rectifier circuits.

Keywords: ESP32, Capacitive sensing, Liquid level monitoring , Android Application.

| DOI: 10.17148/IARJSET.2022.9128