Modeling of A LDR Based Liquid Level Detecting Device Using Power Function

All vehicles require liquid to move from one point to the other; and it is necessary for the driver of the vehicle to ascertain the volume (level) of the liquid in the tank before setting out on a journey, hence the need to know the level of the liquid in the tank. This paper therefore presents modeling and simulation of a sensory device, which evaluates the volume VLQD of any type of liquid in any type of a closed container that has a cross-sectional area A (m2) and height h (m). The main attraction of the approach is that it does not get in touch with the liquid, its simplicity and lower cost. The aim is achieved by using a sensor, Light Dependent Resistor (LDR); which operates on a principle which states that the voltage ELUX in Volts across a LDR is a function of luminance it receives from a light source, Light Emitting Diode (LED). This principle and a power function developed using experimental data were used to model VLQD; which reveals that VLQD in litres is a function of ELUX in Volts. The model of VLQD was simulated for the sake of validation in the Proteus 8.9 professional environment. The results obtained revealed that the proposed model correctly indicated the VLQD in litres in a closed container that its A (m2) and h (m) are known and specified in the model.