Suzhou Home Network brings you a comprehensive understanding of smart furniture. Is smart furniture good? Have you ever used it? The focus of this article is to tell you the characteristics of smart furniture, so that you can understand them more clearly! Smart home integration integrates equipment related to home life with integrated wiring technology, network communication technology, security technology, automatic control technology, and audio and video technology. Due to the different technical standards and protocols adopted by smart homes, most smart home systems use integrated wiring, but a few systems may not use integrated wiring technologies, such as power carriers. In either case, there must be a corresponding network. Communication technology to accomplish the required signal transmission tasks, so network communication technology is one of the key technologies in smart home integration.
When it comes to network communication technology, many people will immediately think about the electromagnetic radiation pollution that may be caused by the operation of these electronic devices. As more and more types of electronic products enter the modern life, home electromagnetic radiation The problem of pollution exposure has also become particularly interesting. As far as the installation of smart home systems is concerned, there are mainly wireless and wired modes during installation and commissioning. Due to the complicated wiring, complicated connections, large workload, high cost and difficult maintenance, large-scale promotion cannot be carried out. The wireless method is not widely used for these reasons.
Since the smart home uses wireless transmission control signals, several radio technologies commonly used to transmit signals are: Bluetooth (working frequency: 2.4G), WIFI (operating frequency: 2.4G, 5.8G), zigbee (working frequency: 2.4G, 868M) , 915M), 315M/433M/868M/915M, etc. At low power, wireless transmission is limited by distance, and the radio radiation generated in this case is very, very small. If sufficient distance is required, it is required to increase the power of the equipment, which will result in stronger electromagnetic radiation than in the case of low power. In addition to the various household appliances, low-frequency electromagnetic field devices (such as wires, switches, etc.), broadcast television signals, communication signals, etc., all of these signals overlap to make the electromagnetic radiation situation in the living environment more complicated. Despite the management of exposure limits in such complex electromagnetic radiation environments, the state has more systematic regulations and standards. In theory, as long as the electromagnetic radiation intensity generated by these electronic devices in our daily life does not exceed the above standards, then We don't have to worry about being hurt by them.
In fact, there are still many people who are worried about this, because WIFI radiation has been a lot of controversy, and rumors about WIFI killing and harmful to pregnant women have been continually. Some time ago, a husband in Fuzhou worried that pregnant women at home were affected. Every day, they knocked on the door and let the residents of the whole building turn off WIFI. Although the WIFI radiation situation can not be confirmed, but let go of the radiation, let us look at the application of WIFI in smart home, will there be other problems?
WIFI is popular early, many smart devices such as mobile phones and computers are supported. Therefore, there are many smart home products based on WIFI, WIFI sockets, WIFI bulbs, WIFI switches, WIFI curtains... When you turn all the homes into smart ones At the time, your home WIFI users increased by at least 5 times. However, once the user has access, it will inevitably slow down your network speed. Suppose you are playing online games, your wife uses WIFI to watch movies, how can online games be cool? At this time, sockets, lights, switches, refrigerators, air conditioners are running over to join in the fun, what online games do you play? Although WIFI can provide 300M Into the speed, but usually the download speed can be dozens of megabytes is very good, because the radio waves of the radio are spatially covered, your device must share bandwidth with other devices. Zigbee, which was born specifically for low-speed transmission, is to make up for the shortcomings of WIFI.
First, Zigbee focuses on low-transmission applications, with low data transmission rates. The same 2.4G frequency band, Zigbee's transmission rate is up to 250k, far lower than WIFI. According to Shannon's theorem of radio communication, C=W*log2*(1+S /N), C is the network speed, W is the bandwidth, and S/N is the signal to noise ratio. The so-called signal-to-noise ratio, in simple terms, you transmit 0 and 1 signals, using 0.1 unit of energy to represent 1, and 0.1 units of energy is absorbed by the air during transmission, and you originally sent signal 1 to become Signal 0. And you use 1 unit of energy to transmit "1", the air absorbs 0.1, and receives 0.9 energy, or can be counted as "1". However, in doing so, the power requirements of the radio are greater and the radiation is stronger. Zigbee reduces the dependence on signal-to-noise ratio by reducing the speed of the network. Contrary to WIFI, WIFI is for higher connection speed, and Zigbee is for lower radiation intensity. Zigbee Alliance China Headquarters IoT sensing person predicts that in the next five years, ZigBee will replace the current domestic 315M/433M communication standard, becoming the country that has designated the last 100 meters of ZigBee after the United States and the United Kingdom. . I have been focusing on the research and development of ZigBee wireless smart home research and development. This year, with strong strength, I have won the largest venture capital investment in the domestic smart home industry.
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