The second sensor used to design smart parking system is Sharp Technologys IR Sensor. IR sensor works on object
detection method. In object detection method, whenever there is presence of any object within the Line of Sight (LOS)
of IR sensor, a part of the signal is will reflect back in the direction of IR sensor30. This reflected signal is called an
echo signal. If an IR sensor is deployed in a parking slot, the presence vehicle will obstruct the LOS of IR signal,
resulting in an echo signal, indicating the presence of a vehicle in the parking slot. Similarly, the absence of vehicle
will not result in any echo signal. Indicating the availability of the free parking slot for vehicles to be parked. In this
way, IR sensor is used to detect the vehicle in smart parking system.