An Intelligent Home Security Access System Based On Optical Reverse Technology

With the development of the electronic information industry and Internet technology, various kinds of intelligent products have been produced. For some of the household security products on the market, they were mostly designed facing villas、enterprises and other large places, it is difficult for them to be popular. Therefore, for the home environment, basing on optical reverse access control, the topic is designed to a smart home security system.To begin with, the dissertation has disscussed the acess control system, which is optical reverse modulation type recognition, and then the home wireless local area network(WLAN) which communicates through the WiFi network had been formed. This has realized data interaction between CPU(central processing unit, which also called central processor, based its core board on ARM Cortext-A8) and terminal nodes(based its MCU—microcomputer—on the single chip MSP430). Then to discuss the household security implementation step and finally set up a powerful and low-cost “Intelligent Entrance Guard System”.The design of central processor of Intelligent entrance guard system was completed. the processor not only has a basic access control capabilities, but also has the role of intelligent security monitoring center. And the entrance guard system adopted the current emerging optical reverse modulation technology; it designed the key and the structure of the lock body to the entrance guard system, test showed the frequency and receiving distance of the piezoelectric patches when they receiving the strongest signal; it designed the oscillation circuit, which droves piezoelectric patches in the signal loading part, the amplification filter circuits in the detect part and the detection circuits and so on; it realized the corresponding functional supporting and testing program by writing, besides, this helps made necessary test and analysis to the stability of the entrance guard system prototype. it designed hardware circuits of other SDIO interfaces and LCD display drivers on the CPU, this provided the foundation for the transplantation of Linux operating system on the core board, and constructed corresponding cross-compilation environment. What’s more, the entrances guard system made the CPU of the family and users’ remote interact come true through the GSM module implements. Finally, it completed the design of physical quantity data that the sensors uploaded interface by using the QT software in the PC, and transplanted the interface into the LCD screen of CPU to display.Terminal node is responsible for the collection of all kinds of data in the family environment, such as temperature, pressure and smoke, the quantities of those data gathered will be transmitted directly to the central processor via WiFi module. In addition, the control circuit which in response to the instruction of a central processor was designed on the node, it controls the household electrical appliances, etc.Finally, Intelligent Entrance Guard System structured the streaming media system, configured an FFserver server, and completed the video capture of USB camera. When video capture had been converted into video streaming through the FFmpeg, it uploaded them to the server in real-time.