Several major wireless technologies

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Several major wireless technologies [Copy link]

Speaking of the wireless control method of smart home, it is closely related to the development of wireless technology. With the rapid development of science and technology, wireless technology has also made rapid progress. Basically, when a new wireless technology appears, smart home products will immediately follow up.
　　Smart home based on wireless control has the characteristics of flexible application, no need for wiring, good scalability, and convenient mobility.
　　At present, the global common wireless technologies mainly include the following: infrared, Bluetooth, RFID, ZigBee, WIFI, etc. Let's briefly talk about them one by one.
　　1. Infrared technology-the most widely used communication and remote control technology Infrared transmission is currently the most widely used means of communication and remote control. Infrared remote control devices have the characteristics of small size, low power consumption, and low cost. Nowadays, infrared remote control technology is basically used on household televisions, air conditioners and other electrical appliances.
　　Infrared detection technology is divided into two categories: active infrared detection and passive infrared detection. These two types of infrared detection technologies have different applications in smart homes.

　　Active infrared detection is to send out one or more parallel infrared beams after modulation through an infrared transmitter, which are received by the infrared receiver and converted into digital signals and sent to the alarm controller. If there is an obstacle in the transmission interval, the alarm will be triggered. Active infrared detection is widely used in home alarm systems. For example, a pair of infrared transmitters and receivers are installed on both sides of the window. If an object passes through, an alarm will be triggered immediately.
　　Infrared transmission can be applied to data transmission between home appliances, such as audio transmission. The biggest advantage of wireless infrared technology is its large bandwidth, which even exceeds several other mainstream wireless technologies. This means that audio products using infrared wireless technology can transmit large-capacity audio signals without compression, and can also run at a higher bit rate format.
　　2. WIFI technology-short-range wireless transmission technology WiFi is a technology that can wirelessly connect terminals such as personal computers, handheld devices (mobile phones, tablets, etc.).
　　WiFi, commonly known as wireless broadband, is a short-range wireless communication technology that can support radio signals for Internet access within a range of hundreds of feet.

　　The main advantages of WiFi technology are: First, the coverage of radio waves is wide, with a radius of up to 100m, so not to mention an office of dozens of square meters, even a building of dozens of meters high can be fully covered. Second, the transmission speed is very fast, which can reach 11Mbps.
　　Although WiFi technology is already very advanced, there are few large-scale commercial applications based on WiFi technology. What is the reason? First, large operators do not recognize this model; second, there is a lack of effective business model.
　　Third, ZigBee technology-the most popular wireless technology in the smart home industry ZigBee technology is a short-range, low-complexity, low-power, low-rate, low-cost two-way wireless communication technology, mainly used in short-distance, low-power, and low-data transmission rate occasions. Simply put, ZigBee is a highly reliable wireless data transmission network, similar to CDMA and GSM networks. The communication distance of ZigBee data transmission modules is generally hundreds of meters, but it can also reach several kilometers, and supports wireless expansion.
　　At present, the general wireless smart home system is based on 315M/433M radio frequency one-way data transmission. Since there is no receiving response from the receiver, these wireless smart homes will fail to control when they are interfered, and the system reliability is very poor. The wireless smart home system using the ZigBee standard can completely solve the fatal defect of control failure. It is based on this advantage that ZigBee technology has become the most popular wireless transmission technology in the smart home industry.
　　In summary, each wireless technology has its own advantages and disadvantages, so when users choose smart home products, they can choose according to their own home environment and choose a smart home that suits their actual situation.