Smart home refers to the use of advanced computer technology, network communication technology, and integrated wiring technology to organically combine the seed system related to home life, and make the home life more comfortable, safe and effective through overall management. As an important part of the intelligentization of the community, the smart home platform realizes home intelligence through its core-home smart terminal. The smart home terminal can realize system information collection, information input, logic processing, information output, linkage control and other functions. The early home smart terminal network was based on the telephone network for remote monitoring and remote control. Due to the bandwidth limitation of the telephone network and the high cost of use, the home smart terminal cannot be promoted. With the development of computer technology and communication technology, remote communication based on IP technology has become the focus of home smart terminal development. At present, remote communication devices based on 8-bit microcontrollers and TCP/IP protocols have appeared in large numbers. However, due to the limitation of the operating frequency and storage capacity of the 8-bit single-chip microcomputer, the operating system and the complete IP protocol cannot be transplanted. The real-time performance of remote monitoring and remote control and reliable communication of large data volume are difficult to guarantee, thus becoming a bottleneck for the development of home intelligent terminals. With the mature ARM chip and μCOS-II operating system, this problem can be effectively solved. ARM (Advanced RISC Maehines) is a reduced instruction set computer that integrates typical RISC architectural features. In addition, the ARM architecture features automatic address increment and auto-reduced addressing modes, multiple register load and store instructions. Since its inception, ARM has experienced five major ARM instruction set architectures, represented by version numbers V1-V5. Common ARM7, ARM9, ARMl0, and SecurCore series chips are all ARM V4 and above architectures. The ARM7TDMI series chip is currently the most widely used ARM chip. It is widely used in multimedia and embedded devices, including Internet devices, networks and modems, as well as wireless devices such as mobile phones and PDAs. LPC2214 is a cost-effective ARM7TDMI (-S) chip produced by Philips, mainly used in the field of Internet gateway, serial protocol conversion, access control and so on. 1 System structure and hardware composition of home smart terminal 1.1 System structure of home smart terminal The home smart terminal is the core device of the home intelligence, and is the transfer station of the home internal network and the external network. It implements various functions through various protocol conversion modules and networking methods. The home intelligent terminal proposed in this paper mainly has the following functions: security defense , linkage control, remote control and monitoring, information collection, and family information management. The external network uses the local area network to transmit information to remote terminals (user terminals, cell management terminals, charging terminals, etc.). In addition, considering the instability of the Internet, the system also reserves a PSTN interface to increase system redundancy. The RS-485 bus and Bluetooth technology are used to implement the home internal network, which combines wireless and wired to meet the needs of more devices. The network system of the home smart terminal is shown in Figure 1.
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