Design and Implementation of Infrared Wireless Sensor Networks and RS-485 Networks for Multi-floor Parking Information System

摘要

This paper presents an information system using the parking area wireless sensor networks (WSN) as an alternative solution to the data acquisition method of parking lot availability. Nodes that have the ability to detect the udpresence or absence of cars installed in each parking location. Information from each node was taken to the sub-master's level in multi-hop communication through infrared (IR) and then from the sub-masters data is sent to the master node of a PC via RS485 serial communication. Information can be viewed on a PC display which is also a database server. The prototype test network consists of 1 PC as the master node and 15-network nodes with composition of the 3 master nodes and 12 ordinary nodes that are connected in a tree topology. Each sub-master node prototype has a duty to acquire information from the parking lot a block comprises of four prototypes of the ordinary nodes. Node functions and network performance in transmitting the data retrieval mechanism inferred by IR communication can work well, with a success rate of data transmission reaches 100%, in normal light conditions simulating a parking lot. However there is still delay (latency) of about 4.5 seconds for each additional communication hop.