Design And Realization Of 4-Channel Image Sensor System For Wireless Access

In recent years,along with the country promote the development of Internet technology,the network has gradually entered and affected our daily life,and network-related wireless communication technology has also made considerable progress.Besides wireless communication technology and embedded technology combined with monitoring system have been widely used.Vehicle monitoring is one of those applications,in order to improve travel safety,it's necessary to the intelligent monitoring of vehicles.In this paper,a 4-way image sensor system using wireless access is proposed based on the traditional vehicle monitoring and access scheme,which utilize the layout and wiring of the vehicle and the image acquisition by the analog image sensor.The program replaces the analog module with a digital analog,the transmission method to replace the wired with wireless.The whole system is composed of hardware design and software design.The hardware part: According to the different functions,the hardware part can be divided into three modules,image acquisition module,wireless transmission module and the main control module.Image acquisition module consists of four CMOS OV2640 image sensors.The wireless module is Marvell 88w8782.Master chip is STM32F407,the master chip is the Cortes-M4 core,the master chip control image acquisition module and wireless transmission module,which can achieve image acquisition and wireless transmission function.The master chip is based on the Cortes-M4 core.The hardware part of the system also introduced the wireless module,the image sensor module,the power supply part and the debugging interface and so on the circuit design in detail,has guaranteed each function module normal use.The software part: This part mainly is writes the code,realizes the corresponding function on the hardware platform.It mainly involves two parts,the first one is transplanting UCOSII operating system,configuring library function,Lwip protocol stack needed for data transmission,the second one driving and initializing development of each functional module and software development of mobile terminal based on Android operating system on STM32F407.Wherely the SDIO communication and DMA communication driver implementation,as well as SOCKET network communication are introduced in detail.Finally,the system designed in this paper can collect 4-channel images,and the collected images wirelessly transmitted to the Android through the router to achieve real-time display of the function.First,this paper introduces the development of wireless monitoring industry at home and abroad.Second it puts forward the design of the system together with overall program design and completed the hardware circuit and software design.Finally,it analyzes and validates the whole system,and puts forward the problems that the system needs to be solved and perfected.