Design of Public Transportation Information Platform System Based on ZigBee

In recent years, with the rapid development of China's cities. The number of urban population and the number of private cars owned by citizens are increasing year by year, making the city's traffic congestion worsening. Traffic congestion is a common problem faced by large and medium-sized cities in China, and the problem of citizens' difficulty in riding a car caused by the congestion situation troubles everyone. At the same time, the environmental pollution caused by it is also very serious.

According to the overall level of research on vehicle positioning technology at home and abroad, it can be concluded that the current positioning technology has its own advantages and disadvantages. Through the current research on vehicle positioning technology, we can know that the best solution is to select the data information fusion of multiple systems and then obtain the best solution in a certain sense according to the appropriate algorithm. At present, the city is developing rapidly, people are relying more and more on public transportation, and the requirements for the quality of transportation services are becoming higher and higher. If the arrival information and vehicle information of the bus can be notified to the waiting people in a timely and accurate manner, It plays an important role in alleviating the congestion of station personnel during rush hours. The information prompt system installed on the bus waiting station sign will provide the waiting people with the arrival time of the coming train and the personnel situation on the bus, and also know the approximate arrival time of the next bus, so that Passengers waiting for the bus can make preparations in advance according to their own needs, to provide convenience for passengers to travel.

1 System design plan

The system uses ZigBee wireless sensor network technology to timely and accurately reflect the specific location of the bus to the computer system of the bus dispatching station and publish it to the driving route station in time, so that the passengers and dispatchers can understand the driving status of the bus on the current route. And distribution. Passengers can understand the current driving information of vehicles; dispatchers can arrange and dispatch reasonably according to the real-time running data of vehicles. When an emergency occurs (such as traffic jam, vehicle damage, etc.), the dispatch center can make more reasonable dispatch arrangements, and can effectively avoid the phenomenon of early departure of bus drivers.

The intelligent bus system can estimate the time to reach the next stop based on the vehicle's position and the average speed of the vehicle. The location information of the bus vehicles is transmitted to the bus stop plate through the ZigBee network and displayed to the passengers through the electronic display screen, so that the passengers can always know the information of the vehicle to be taken; at the same time, the location information is finally transmitted to the dispatch center through the forwarding of the ZigBee node for dispatch personnel Dispatch and assign vehicles. The application of vehicle positioning and tracking technology in this system can understand the distribution of passenger flow on the line, provide a basis for the formulation of driving schedules, and at the same time, can effectively solve

Determine the current status of bus operation and improve the level of vehicle management.

2 System hardware design

The hardware platform of intelligent bus system consists of CC2430 / 2431 chip, gateway system, wireless reference node and positioning node, and uses wireless positioning mechanism to locate the moving vehicle and collect and forward the positioning data.

2. 1 ZigBee wireless positioning microcontroller CC2430 / CC2431

The CC2430 / CC2431 chip is developed on the basis of the CC2420 chip architecture, which integrates the microcontroller, memory and ZigBee RF front end on the chip, as shown in Figure 1. Mainly consists of an 8-bit MCU (8051), 32/64 / 128KB programmable flash memory, 8KB RAM, analog-to-digital converter (ADC), timer (TImer), AES128 co-processor, 32 kHz crystal oscillator with sleep mode It consists of timer, watchdog timer, power-down detection circuit, power-on reset circuit and 21 programmable I / O pins.

2. 2 gateway systems

The gateway system includes a backplane and CC2430 ZigBee module. The bottom panel has graphic Chinese character LED liquid crystal display, ZigBee wireless module interface, adjustable resistance, LED, keypad, power interface and RS-232 interface.

2.3 Wireless reference node and positioning node

The module contains CC2430 / CC2431, which is a ZigBee wireless network module that conforms to the IEEE 802.15.4 standard. The CC2430 / CC2431 module has a physical layer and a hardware layer of ZigBee / 802. 15.4, and can realize wireless communication of data through the physical layer and the media access control sublayer.

2. 4 ZigBee wireless positioning system

ZigBee wireless positioning system consists of two parts: wireless positioning network and host computer monitoring software. The wireless positioning network node in this system adopts the CC2431 chip with hardware positioning engine function produced by TI / Chipcon and the CC2430 chip with routing function. The wireless positioning network is mainly composed of terminal nodes, reference nodes and gateway nodes;

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