The prototype system is generalized in a sense that it can be deployed anywhere (indoor or outdoor) and the system
should sustain in every environmental/weather conditions. In order to design a reliable and robust sensor network, the
first and foremost step is the selection of sensor to detect the availability and unavailability of the parking slot through
the presence and absence of vehicle. Since LDR and IR sensor are used, it is important to understand their theory of
operation for each sensor/ The working principle of both sensors is discussed below: