The Internet of Things, the Internet of things and things. It is the extension of the extension of the Internet concept, and realizes the information identification communication between the sensing device and the intelligent terminal through the radio frequency identification technology and the cloud service. The Internet of Things has multiple intelligent application areas, such as smart home , smart medical, intelligent industry, intelligent agriculture, intelligent logistics, intelligent transportation, and smart grid. Among them, the smart home industry is considered to be the next trillion-level sunrise industry. According to the survey data, more than 100 million of China's current 1.3 billion people are likely to become potential smart home users. If the per capita expenditure on smart home is 5,000 yuan, then the smart home industry has a market potential of 500 billion. With the rapid development of China's economy and the expansion of the wealthy, the output value of smart homes will clearly reach the trillion level in the next few years.
Smart home, which uses family houses as a carrier, connects devices related to home life through wired/wireless communication technologies, and can remotely control remotely with smart mobile devices to achieve immediate control of home information. Simply put, as long as you have a smart phone connected to the Internet, you can remotely control home appliances, lighting, security, etc., instantly manage and monitor the home environment, improve home convenience, comfort, safety, and artistry, and achieve environmental protection and energy saving. aims.
How to use communication technology to achieve home intelligence? At present, there are two main types of technologies applied in the field of smart homes, namely, wired technology and wireless technology. Among them, the wired technology can be summarized as: bus technology and power carrier technology; wireless technology mainly includes Bluetooth, Wi-Fi, Z-Wave, ZigBee/SmartRoom technology.
In the wired technology, the bus technology has won the favor of many large-scale communities or projects with its good stability and security. However, in the personal smart home application, due to the wired characteristics, it is necessary to open the wall and hole wiring, and the wiring is complicated and beautiful. The large amount and long installation time must be carried out simultaneously with the basic decoration construction, and the maintenance is difficult, difficult to upgrade, and the cost is extremely high, which is unbearable for the general family. Another special wired technology, the power carrier, is to transmit communication signals by carrier on a wire. The power carrier does not need to be re-routed, but since the power itself has a reduction effect on the carrier signal, the stability of the carrier signal and the transmission distance are greatly affected. If a power carrier is used, a large number of supporting devices such as transmitters and receivers are also required to be installed, which affects the appearance of the home.
Compared with wired technology, the advantages of wireless technology are obvious: no wiring, easy installation, flexible use, easy to expand, easy to replace, and easy to maintain.
Bluetooth
Bluetooth is a wireless technology that supports short-range communication between devices. The effective distance is usually within 10 meters. Bluetooth uses a decentralized network structure and fast frequency hopping and short packet technology to support point-to-point and point-to-multipoint communication. The working frequency band is 2.4G and its data rate is 1Mbps. Because of its short effective communication distance, the communication method is peer-to-peer, and it is difficult to apply in the smart home field.
Wi-Fi
Wi-Fi is also a short-range communication wireless technology, its effective distance is longer than Bluetooth, usually within 100 meters. Wi-Fi is a wireless network signal based on the IEEE802.11 protocol, also known as wireless fidelity. It is a high-frequency wireless signal that enables devices to be connected wirelessly. Wi-Fi enables users to easily access the Internet, but due to its high power consumption and low security, it is difficult to meet user needs, making its application in the smart home field limited.
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