Smart home appliances are home appliances that are formed by introducing microprocessors, sensor technologies, and network communication technologies into home appliances. They have automatic perception of residential space status, home appliance status, and home appliance service status, and can automatically control and receive residential users in residential or remote locations. At the same time, as a part of smart home, smart home appliances can be interconnected with other home appliances, homes and facilities in the house to form a smart home function. 1 Networking function. Various smart home appliances can be connected through the home LAN, and can also be connected to the manufacturer's service site through the home gateway interface, and finally can be connected to the Internet to realize information sharing. 2 Intelligent. Smart home appliances can automatically respond to different environments, without human intervention. For example, smart air conditioners can automatically adjust their working conditions to achieve the best results according to different seasons, climates and user locations. 3 openness and compatibility. Since the smart home appliances of the user's home may come from different vendors, the smart home appliance platform must be developmental and compatible. 4 Energy saving. Smart home appliances can automatically adjust working hours and working conditions according to the surrounding environment, thus achieving energy saving. 5 ease of use. Since complex control operations have been solved by controllers embedded in smart appliances, users only need to understand very simple operations. Smart home appliances do not refer to a single home appliance, but should be a technical system. With the continuous development of human application requirements and smart home appliances, its content will be more abundant. The functions of smart home appliances will also vary depending on the actual application environment. The difference, but generally should have the following basic functions: (1) Communication function. Including telephone, network, remote control / alarm, etc. (2) Intelligent control of consumer electronics products. For example, a microwave oven that can automatically control heating time and heating temperature, a smart air conditioner that can automatically adjust temperature and humidity, and a TV/recorder that can automatically search for TV programs and record according to instructions. (3) Interactive intelligent control. The voice control technology can realize the voice control function of the smart home appliance; through various active sensors (such as temperature, sound, action, etc.), the active action response of the smart home appliance can be realized. Users can also define different responses of different smart appliances in different scenarios. (4) Security control function. Including access control system, automatic fire alarm, gas leakage, leakage, water leakage, etc. (5) Health and medical functions. Including health equipment monitoring, remote diagnosis, elderly or patient abnormal monitoring. The rapid development of intelligent control technology and information technology has also provided possibilities for home appliance automation and intelligence. Smart home appliances have home appliances that automatically monitor their own faults, automatic measurements, automatic control, automatic adjustment and remote control center communication functions. Traditional household appliances include air conditioners, refrigerators, vacuum cleaners, rice cookers, washing machines, etc. New home appliances include induction cookers, disinfection cupboards, and steamed cookers. Regardless of new home appliances or traditional household appliances, the overall technology is constantly improving. The key to the advancement of household appliances is the use of advanced control technology, which turns household appliances from a mechanical appliance into a smart device. The smart home appliance reflects the latest technology of home appliances. Everyone can often see such a scene in a large movie in the United States. If you wave the TV, you can turn it off and look at the watch, you can locate the situation in your home. In fact, such high-tech products can also be realized in people's lives, it is smart home. So is this smart home really as good as the movie? What is the smart home? The advantages of smart home Smart home can realize remote control, security, security and other comprehensive control management, which is highly praised by many people. Nowadays, many companies that produce smart homes will install a communication network inside the smart home, so that all the home appliances and home equipment in the home can be controlled by one button. Imagine that when you have not returned home, you can open the water heater in your home by mobile phone, automatically boil water, and then open the curtains in your home, and the air conditioner will open, creating an atmosphere like the owner at home. This not only allows the user experience to upgrade, but also prevents thieves from entering, which is the lifestyle that many modern people dream of. At the same time, the smart home can also effectively control the switch of the air conditioner in each room, as well as the temperature adjustment of the air conditioner. If there are children in the house, it can also detect the dynamics of the child in the room and the time management of the Internet. The most important thing is that if a smart home is installed, if there is a gas leak or a water pipe burst in the home, the smart home will inform the owner at the fastest transmission speed and call the helpline in the first time. Shortcomings of smart home Smart homes are good, but they also have shortcomings. That is the high price. For the general public, installing smart homes costs around 100,000 yuan, which is very uneconomical. Therefore, at present, most of the places where smart homes are installed in China are some villas. The average family homes rarely have smart homes installed. The concern is the price. In addition, the operation of smart home products is not humanized. It is not that the hands that are seen in the movie can open all the devices, which makes the experience of many users not good. The operation of the smart home is very complicated and difficult to use. The most important point is that the smart home products that exist in the domestic market are mixed and there is no uniform production standard. So consumers have spent a lot of money buying and installing smart homes, but it's really hard to use. Although there are some foreign big names and the product quality is good, the market entering China does not take into account the difference between the Chinese community and the US community, and it is not suitable for installation. Through the analysis of the advantages and disadvantages of smart home, we can conclude that smart home is indeed a very good product of the times, but it is a new thing, it needs to go through a development stage, it will gradually mature, the price becomes lower, operation It is more convenient and simple, and is accepted by the general public. The pin refers to the connection between the internal circuit of the integrated circuit (chip) and the peripheral circuit, and the pin constitutes the interface of the chip. According to the function, the pins of AT89S52 can be divided into four categories: main power supply, external crystal oscillator or oscillator, multi-function I/O port, and control, strobe and reset. 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