Design And Realization Of Embedded Parking Lot System Based On RFID Technology

As more and more cars come to use in the city, the disadvantages of traditional parking lot gradually come out. Many problems exists in the traditional parking lot,such as poor security and reliability, lack of network support,low throughput,etc,which can't meet the requirements at present.Based on the research results of project "the development of can-awaken wireless network system based on vehicle automatic detection and safety management",which is invested by Shenzhen Bureau of Science and technology , with many theoretical research and engineering inovations,the next generation of embedded parking lot system based on RFID is putted forward in this paper. The paper is arranged as follows:(1) The panel of the embedded parking lot is designed according to the modular design concept, which made the panel more easy to upgrade and maintenance, and the the service life of the parking system is greatly prolonged.(2) The kernel of RTOSμC/OS-II is successfully ported to the PIC18F MCU through the kernel. An improved group task scheduling algorithm is proposed.The shortcoming ofμC/OS-II task scheduling algorithm is overcome in this algorithm.(3) Based on the study of RFID anti-collision algorithms, an improved dynamic framed slotted ALOHA anti-collision algorithm is proposed.In order to improve the rate of label identification, this algorithm adopts the methods of unique ID mapping and dynamical adjustment of the frame size by Q value.And this algorithm is easy realized in the hardware and software,.(4) Most parking lot system is lack of network associate and only can use in small region. In order to solve this problem, the CAN/Ethernet gateway is designed.The hardware and software design of this gateway is represented in detail, which based on ENC464J600 Ethernet interface chip and SJA1000 CAN control chip. The embedded parking lot system in this paper has been successfully used in some courts and high-speed fee systems, which fully verified the rationality and reliability of the design.And it provides a strong support for the following application software.