Design and implementation of ZigBee wireless bus monitoring system

With the advantages of low cost and low power consumption, Zigbee is widely used in internet of vehicles. In a big city has a large number of bus and other passenger transport vehicle, there is a strong demand for unified bus operation scheduling and monitoring system. This paper described the design and implementation of a vehicle network system based on ZigBee wireless network . This system can help the management of entry and parking in passenger station through the ZigBee network. After the actual deployment and testing, the project achieve the expected goal.. Introduction Internet of things is a multi-functional wireless network including data collection, transmission and processing. Compared with traditional wired networks, it is more convenient to build a network, suffered less impact from the environmental, need lower power consumption and lower cost[1]. ZigBee is one of the typical short-range wireless communication technologies, which has been widely used in a certain application areas including the family network, control network, mobile phones and other mobile terminals [2]. As an important part of the Internet of things, in recent years the development of Internet of Vehicles is fast[3]. Internet of Vehicles usually based on WiFi, 3g/4G mobile network. Due to the low power consumption, less communication cost, and other advantages, ZigBee become an important technology used in vehicle network[4] [5] [6]. In the process of development that using the Zigbee technology in wireless sensor network, as the transmission power of all on-chip wireless communication system is very low, coupled with the receiver sensitivity is also fixed at a certain level, communication range of wireless sensor networks is limited, commonly a hundred meters or so[7] [8] . In this paper, the a city bus monitoring and management system based on ZigBee network is proposed. The ZigBee terminals are equipped in the vehicles and bus station. The network is formed among the ZigBee terminals. It realizes the small terminal with low power consumption and low cost. The ZigBee can connect more than 5000 devices in the network simultaneously. Moreover, the ad-hoc function and multi-hop function are equipped. Overall design As shown in Fig.1 and Fig.2, the bus monitoring system consists of two parts. The server part is used for storing and processing data. The other part is communication layer. Communication layer includes gateway (sink node), bus station terminal (RSU Road Site Unit) and vehicle terminal (OBU Onboard Unit). Design of OBU.OBU mainly consists of five modules: ZigBee wireless communication module, RS232 bus communication module, CAN bus communication module, 485 module, and battery power management module. ZigBee wireless communication module is mainly used to upload the OBU information, the driver license and RSSI summary information; RS232 bus communication module is mainly use to read the International Conference on Information Sciences, Machinery, Materials and Energy (ICISMME 2015) © 2015. The authors Published by Atlantis Press 161 driver information from the ZTM216 module(Storage of bus driver information); CAN bus module is mainly used to read information of vehicles, such as speed, amount of oil; 485 bus module is used to read the peripheral information; battery power management module the vehicle is in a rest, vehicles entering the battery mode to power management role. The design of the terminal hardware schematic diagram is shown in Fig.3.