The modern family has moved from pursuing the luxurious decoration of homes to home intelligence, enjoying the diversified information brought by intelligence, as well as the safe, comfortable and convenient living environment. In particular, the development of the Internet of Things and 3G mobile technology, intelligent life allows you to truly appreciate the home forever.
The smart home system is a comfortable, safe, convenient and environment-friendly home living environment that integrates automation, information, and intelligence using computers, embedded systems, and communication network technologies. At present, the degree of intelligence in smart home life depends on the accuracy and reliability of information transmission, mainly wired transmission and wireless transmission. Wired transmission has the disadvantages of complicated wiring, poor expandability, inconsistent standards, and difficult construction. It is difficult to obtain a large market space. Radio frequency technology is a short-range, low-complexity, low-data-rate, and low-cost wireless communication technology. Because it does not require rewiring, point-to-point radio frequency technology is used to control home lighting and other equipment, and installation is convenient. The control method is simple and has been widely used in smart homes in recent years. Therefore, the realization of intelligent life based on wireless radio frequency technology for information transmission is the focus of current smart home research. It will provide people with a comfortable, safe, and convenient living environment.
First, the system architecture
The smart home system based on wireless radio frequency technology mainly includes a home gateway and several communication sub-nodes. A wireless transceiver module is configured at the home gateway and each wireless communication sub-node, and data and control information are transmitted between the gateway and the sub-nodes to realize mutual information flow sharing. Wireless communication sub-nodes mainly include smart remote controllers, smart sub-controllers, and smart switches.
Figure 1 Smart home
The home intelligent gateway is the core of the system. It uses a 32-bit RISC computer ARM processor to build an embedded Linux operating system platform and set and query the status through the keyboard or touch screen LCD. The intelligent gateway is connected to the Internet and the PSTN, and can convert received control commands (including local remote command, far-end voice commands, remote handset commands, remote computer commands, etc.) into wireless RF signals and transmit them through the RF transmitting module. Launched to achieve intelligent home control.
The intelligent remote controller communicates with the home gateway through a wireless interface on the one hand, and has an infrared self-learning function on the other hand. The infrared remote controller can decode, learn, and store the infrared code values ​​sent from different infrared remote controllers, thereby implementing multiple infrared remote controllers. One. The buttons on the LCD screen of the smart gateway correspond to the keyboards of the smart remote controller in a one-to-one correspondence. The user defines different button descriptions on the buttons of the smart remote controller, and binds infrared codes having different control functions. The intelligent remote controller sends the learned infrared signal code value to the infrared intelligent control center or the infrared sub-control center through the wireless transmitting module to realize the registration of the infrared code value on the smart sub-controller. When the smart gateway enters the smart home control interface and presses a control button of an electrical device, the code value is transmitted through the wireless transmitting module for RF signal transmission; the smart subcontroller will receive the wireless code value in the established list. Compare it, convert it into an infrared signal, and launch it to control home appliances. The smart switch can receive the code value of the wireless signal transmitted by the smart gateway or the smart remote controller to realize the switching operation of the home appliance.
Second, characteristics and advantages
With the continuous improvement of the digital community, the maturity of 3G technologies and the continuous development of the security market, digital home automation systems have gradually become the mainstream of building intercom systems. Integrate cutting-edge technologies such as Internet, multimedia, RF carrier, security, monitoring, detection and sensing, and biometrics, and adopt a common and complete communication protocol to ensure the system's transmission capacity and reliability, and build a system that integrates multiple systems into one. Home platform. In particular, a smart home system based on wireless radio frequency technology is set up, and with the help of 3G technology and Internet technology, remote control functions are realized to greatly improve people's lives.
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