Smart home appliances is the use of generic cabling technology, network communication technology, security technology, automatic control technology, audio and video technology to integrate the facilities related to home life, build an efficient family schedule management system, improve safety, convenience, comfort, artistry, and achieve environmental protection and energy saving environment. The most common applications are lighting, water heater, air conditioning, intrusion monitoring, smoke alarm, video monitoring and curtain intelligent control.

  Comparison between wired communication control and wireless communication control

  (1) Wired control

The structure of wired control is that the controller is placed in the strong current box, and the switch and the central control host are controlled through the weak current control line respectively. Wired control adopts wired communication technology. The advantages of wired control: safety and stability, no interference; The disadvantages of wired control: the scheme is not designed, the requirements are high, the requirements for line erection are high, and it is difficult to expand and change later. This way is widely used in the early development of smart home, which is transformed from industrial control. It is mainly suitable for large areas of commercial places and other places with centralized management by special personnel, and is gradually replaced by wireless communication.

  (2) Wireless control

Wireless control uses wireless communication technology to control the equipment. Advantages of wireless control: simple installation and wiring; Disadvantages of wireless control: the anti-interference performance is worse than wired control, and the signal coverage is affected by buildings.

  The main advantages of WiFi technology in smart home are as follows:WiFi smart node can be directly connected to the wireless router to access the Internet; The node can be expanded arbitrarily without the need of home gateway; Will not damage the existing decoration; Smart phones can be used for LAN control and remote control. Of course, compared with ZigBee and 433 MHz RF communication technology, WiFi technology also has its disadvantages: high power consumption and high price. But with the introduction of energy-saving technology and the improvement of chip technology, the problem of power consumption and price has been gradually solved. Since WiFi module is the standard configuration of notebook, tablet computer and smart phone, smart home based on WiFi technology will be gradually promoted and applied, with broad market prospects.

  Control circuit design of WiFi socket

Instructions for circuit design of WiFi based smart home appliances

  Circuit principle:The module receives the closing command, the PC8 port outputs high level, Q1 is on, the relay coil has current flow, the relay contact L_ In and contact L_ Out pull in, socket power supply to load; The module receives the disconnection command, the PC8 port outputs low level, Q1 is cut off, the coil of the relay has no current, and the contact l of the relay is closed_ In and contact L_ The out is disconnected and the socket is powered off. The above just takes WiFi socket as an example to describe the smart home based on WiFi technology. If you want to realize other functions in smart home appliances, the implementation principle is similar. For example, to achieve remote video monitoring, just change the socket into a camera and implement the corresponding software functions.

With the improvement of people’s quality of life, the concept of intelligence will be more and more popular, and the cost of using a full set of intelligent system is very high, and for the residential buildings that have been delivered for use, the transformation is still very troublesome. Using WiFi smart socket, you don’t need a home gateway, you don’t need to destroy the existing decoration, you can easily realize the intelligent control of household appliances, you can build a smart home based on WiFi technology by yourself, and experience the convenience brought by technology.

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