The Development And Implementation Of Multi-phase Traffic Signal Controller Based On ARM7

Transportation is the life of economy and living, and weighs the symbols which a city civilization progress. Signalized intersection, as the basic unit of city road network, is the bottleneck region of the entire urban road. Traveling capability of signalized intersection directly influences that of road network. So study and development of efficient traffic signal controller of the signalized intersection has very important practical meaning and application value.This paper taking the single intersection as the research object, realizes multi-time and multi-phase control. So the 24 hours in a day can be divided into lots of time sections, and users can set different phase control and traffic signal parameters according to actual traffic conditions at the intersection. Single point control has been improved to achieve the network connection of the traffic signal controller and PC, so users can monitor the traffic situation on PC. The traffic signal controller in this paper has been put into practical use in Suzhou and Yancheng and proved to have good reliability and high efficiency.The hardware platform of the controller is based on ARM7 and microcontroller chip LPC2214 which is from Philips is adopted. The main control board integrates LCD screen to provide good man-machine interface for users to view and modify the signal control parameters. The real-time clock chip DS1302 provides calendar, and after power off the chip can be supplied power by back-up battery to ensure the correct time. EEPROM chip is used to ensure the save of important data after power off. The software platform is based on uCOS-II embedded operating system to ensure the stability and reliability of the controller.