Design and implement of a parking space sensor

This paper presents the parking space sensor system. This system is composed of car sensors, signal light controllers, sensor hubs, and a data processing server. The system uses RS485 as a communication link between controllers while using MQTT protocol to communicate between controllers and the processing server (MQTT broker). By using RS485 and MQTT, this system is scalable and flexible. The experiments are conducted in the local shopping mall with 50 cars in the evaluation process. When a car moves into a parking space, the system has the latency of this 5 seconds before changing the status of the parking from free to occupied. The results show that the system is functional as it is designed for, and it can be implemented to use in the real world.