Abstract: This paper introduces a design and implementation scheme of a networked smart home system based on ZigBee technology. The system hardware uses S3C2440A as the control core. CC2430 is used to set up the home internal network to collect the digital signals of the home devices, and the USB camera is used to collect the video signals inside the home. The software uses the embedded Web server and CGI technology to connect the home intranet to the Internet to achieve remote monitoring. The actual test proves that the system is powerful and stable, and meets the requirements of family information network. 1 Introduction With the advent of the information age and the rapid development of network technology, the realization of home information and networking is a new trend in the development of smart home equipment systems. The smart home system is a unified system of relatively independent household appliances, which enables intelligent management, remote monitoring and resource sharing of these devices and home environments. Its purpose is to provide people with a safe, comfortable, efficient and convenient living environment. This paper introduces a design and implementation of a networked smart home system based on embedded Web and ZigBee technology. 2 System structure and function introduction The system consists of a remote PC, an embedded gateway, a USB camera and a ZigBee home wireless network. The design idea is to install a ZigBee module and corresponding sensors on each home device to form a terminal node to monitor the status of the device in real time, and send the collected data wirelessly to the ZigBee Coordinator, so that ZigBee The coordinator and each terminal device form a wirelessly connected star-shaped home internal network. The embedded gateway is the backbone of the system. It can transmit the video information collected by the USB camera and the terminal node signals received from the coordinator to the Internet, thus connecting the internal network to the Internet. In particular, the use of the USB camera allows users to visually see all the changes in the home, making up for the lack of digital information for most home smart devices. Users can access the home network through a remote PC to view digital and video information of the home device for remote monitoring purposes. 3 system hardware design 3.1 core processor module The system uses S3C2440A as the core controller. It is an ARM920T core-based processor from Samsung. It uses a 16/32-bit RISC processor with an external memory controller, LCD controller, and 4-channel DMA controller. Three-channel UART, two-channel SPI, two-way full-speed USB host device chip with MMU virtual memory unit. This feature can be used to port Linux systems and establish Web servers at 400MHz, with 130 I/O ports and 24 external channels. Interrupt source, a variety of communication interfaces, small size, low power consumption and low cost, high reliability, especially suitable as an embedded microprocessor. 3.2 storage module The NAND FLASH memory module selects the K9F1208U0M-YCB0 64M*8bits high-performance memory chip manufactured by Samsung. Information is not lost after power down and is used to store boot code, kernel, and file system. SDRAM is the memory of the system. It does not have the characteristics of power-down and data retention. Its access speed is much higher than that of flash memory. It is mainly used as the running space, data and stack area of ​​the program. The SDRAM of the system uses the K4S561632C-TC75 chip. The K4S561632C-TC75 has a storage capacity of 16M*16 bits (32M bytes) and a data width of 16 bits. Since the S3C2440A is 32-bit and the external bus is also 32-bit, in order to maximize the performance of the processor, the system selects two. The K4S561632C-TC75 chips are connected in parallel to form a 32-bit memory system. 3.3 Ethernet interface The system uses the CS8900A chip to establish a network interface. The CS8900A is a single-chip, full-duplex, high-integrated Ethernet controller that fully supports the IEEE802.3 standard from Cirrus. In this system, the network controller plays an important role. It is responsible for sending monitoring data to the Internet and transmitting control commands from the Internet to the bottom layer. 3.4 Camera selection For the image acquisition sensor, a USB camera with Zhongxing Micro's ZC301 sensor chip as the core is used as the image acquisition module. The Zhongxing Micro 301 series HD chip has automatic gain enhancement technology for image light source, advanced white balance, edge enhancement and gamma correction. Bamboo Diffuser Bamboo Diffuser,Bamboo Oil Diffuser,Bamboo Essential Oil Diffuser,Aromatherapy Diffuser Shenzhen Dituo Electronic Co.,Ltd. , https://www.sz-dituo.com
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