Research Of Underground Parking LED Intelligent Lighting And Parking Guidance System

Aiming at the problems existed in underground parking such asunreasonable illumination distribution, low efficiency, high power consumptionof lighting source, single controller, the problem that the driver can not obtain theempty spaces information in underground parking, and the problem that theylook for parking spaces blindly and so on, an underground parking LEDintelligent lighting and parking guidance system is designed in this paperaccording to the characteristics of LED lighting source. The system combiningLED lighting and parking guidance can not only solve the problems such as highpower consumption of lighting source, but also provide specific empty carinformation and the parking path for the driver. The main work is summarized asfollows:1）Based on the ZigBee network, the overall structure of system is designed.The entire underground parking lot is covered by the LED lamp terminal nodes,the parking space detection terminal nodes, the router nodes and the coordinator.LED lamp node is realized the function of intelligent following lighting controland lighting guide; Parking space detection node is used to collect parkingaccount for lack of information; Router node is mainly realized the dataforwarding between each terminal node of this area and the coordinator; Thecoordinator is mainly realized the building and maintenance of the entire ZigBeenetwork, the storing information of all nodes, and is used to communicate withthe monitoring center by Ethernet.2） The optimization Dijkstra algorithm with constraints is proposedaccording to the underground parking space model and driver’s demand. Theparking space model is established taking the shortest path from entrance toparking, the walking distance and convenience from parking to pedestrian exit aswell as the parking security as the major factors, this algorithm is programmed inVC++6.0environment, the result shows the operation time and complexity isobviously decreased. 3）The hardware design of LED lamps node、parking space detection node、router nodes and the coordinator is completed by taking the CC2530F256madeby TI company as the core. The people and vehicles moving information iscollected through the microwave sensor, and the PT4207constant current driverprogram is used in LED lamps node; The parking information is collected byusing ultrasonic sensor circuit; In addition to the power circuit, coordinatorhardware is also constituted by the memory circuit, real-time clock circuit andSerial to Ethernet module ZLSN2042.4）The idea of modularity is adopted by the software part. On the basis ofthe operating system abstraction layer OSAL of Z-Stack protocol Stack, Theapplication layer program development of LED lamps node, parking spacedetection node, routing node and coordinator is completed by the division oftasks. Simultaneously, it is focused on the networking process of higher treetopology network.5）The monitoring center software design is completed using the Visual C++high-level programming language, while the background database is usedAccess2007, which mainly has such functions as living parking management,LED brightness management, fault monitoring, parking guidance, et al.Test results show that the system is operating stable and reliable, thenetworking mode of the system has such features as flexible, strong extensibility,convenient operation. As is verified, the design has a certain promotion andapplication value to improve the management and service levels of undergroundparking lot.