A Design Of Intelligent Transportation PDA Based On Zigbee Technology

Intelligent Transportation Systems (ITS) is the main development trend of our future transport system. In recent years, more and more high-tech equipments are employed in ITS, and the use of PDA is particularly important in the setting of various parameters of the traffic signal controllers placed at junctions or on the highway. ZigBee communication technology, which is characterized by low-power, low-cost, high-reliability, could be applied in severe environment. In this paper it has been designed an industrial grade PDA that uses ZigBee wireless technology to communicate. It can be used to complete configuration of the traffic signal controller’s parameters with wireless network. In addition, it proposed a non-blocking communication and verification methods for the reliability of the communication. In that way, it is no longer difficult to set the intelligent transportation’s parameters in harsh operating conditions.This paper selects AVR series microcontrollers--ATmega128-161, as the core processor of the PDA, which has a low power consumption and high cost performance and communicates with hardware chips through the I2C bus directly. This paper also has a reasonable design of the power management and human-machine interface. The innovative point in the design of PDA’s communication module is it uses the core processor’s dual serial port to establish two kinds of data transmission. It can be connected with the traffic signal controller via RS2332serial, or ZigBee wireless communication network. Utilizing the SZ05-STD wireless communication module to serve as the ZigBee wireless transceiver device connected via ZigBee network, this paper focuses on the establishment and application of ZigBee wireless communication network between the PDA and the traffic signal controller, which broadens the use of PDA in the ITS. In addition, so as to ensure the accuracy and completeness of the data communication, this paper also raises a Cyclic Redundancy Check (CRC) method of non-blocking communication. Finally, it burns the program to the PDA hardware platform, and then debugs the system. The results show that the system could achieve the predetermined function.