There are more and more types of smart products, and the technology used in smart homes is becoming more and more mature. However, in the wireless communication protocol, it has not been able to achieve uniformity. From the current situation, it is impossible to achieve this desire in the short term. In this case, why don't we take a different approach, among these standards, choose the most advantageous and re-use the highest voice? In the current IoT applications, wireless transmission technology can be described as numerous, but the most widely used and most promising applications are Bluetooth, Wifi and ZigBee. Then, who can dominate the three wireless transmission technologies? ? Wifi Speaking of smart home, the first thing that everyone thinks is through the WiFi connection, mobile phones and smart devices to achieve remote control via WiFi, no matter where in the world, as long as there are 3G/4G or WiFi networks can control the home appliances, sockets, light bulbs, etc. Smart products. The Wi-Fi industry has long been committed to making Wi-Fi technology the preferred wireless transmission option in the Internet of Things. In general, WiFi will play an important role in the final success of the Internet of Things. Just a WiFi connection to IoT devices, a recurring criticism is the increase in power consumption and resource usage. But at the same time, Wifi can establish a secure device-to-device connection on the smartphone, allowing users to share pictures. In terms of technology, the main advantage of WIFI is reflected in transmission speed and transmission distance. Its maximum transmission distance can reach 300m, the maximum transmission speed can reach 300Mbps, and the weak point is reflected in power consumption. Its maximum power consumption is 50mA. The other one is the security issue that everyone is currently concerned about. The WiFi encryption method is SSID. Because it is a relatively open structure, users need to pay special attention to the home gateway password. Think about the products in the smart home if they are connected by Wi-Fi. If it is hacked someday, it is really a bit scary. Bluetooth Although Bluetooth is not widely used in mobile phones and computers, it is almost forgotten, but its role can not be ignored. From the 1.0 version to the current 4.2 version, the function is also more and more powerful. In the 4.2 version, Bluetooth greatly enhances the IoT application features, and can realize many new features such as IP connection and gateway setting. The Bluetooth Technology Alliance has announced that smart home has become the fastest growing area of ​​Bluetooth. In recent years, Bluetooth's compound annual growth rate in the smart home field has exceeded 232%. The Bluetooth Technology Alliance also listed the smart home market as the main direction for 2015. Due to technical limitations, Bluetooth is also facing problems such as the signal being easily blocked by walls in smart home applications. The Bluetooth Technology Alliance has established a smart Mesh research group. Since October last year, several companies have used Mesh technology to connect and network Bluetooth. After the networking of multiple Bluetooth devices, the problem of weak Bluetooth signal will be significantly improved. It is believed that in 2016, Bluetooth is believed to be more mainstream than Wi-Fi, with faster transmission speed and wider network coverage, which can lead to faster data transmission. Compared with WIFI, the advantage of Bluetooth is mainly reflected in power consumption and security. Compared with the maximum power consumption of WIFI of 50 mA, the power consumption of Bluetooth maximum 20 mA is much smaller, but the disadvantages in transmission speed and distance are also obvious. The maximum transmission speed and the longest transmission distance are 1 Mbps and 100 m, respectively. Zigbee ZigBee, also known as the Purple Bee Protocol, is a short-range, low-power wireless communication protocol based on IEEE802.15.4. The ZigBee protocol affects the nerves of the global IoT industry and deeply affects the development of smart homes. This is beyond doubt. Unifying the market-leading wireless standard ZigBee into ZigBee 3.0, announcing that ZigBee's application layer protocol will be implemented on the Thread network architecture Zigbee's predecessor can be traced back to Bluetooth. The advantages of both are low-power transmission, but the latter is relatively complex, with fewer network nodes and is not suitable for multi-point control. When the number of smart products exceeds a certain number, it cannot be in the same LAN. Realize interconnection. And Bluetooth transmission is relatively slow, the average time is about 10 seconds; Bluetooth coverage is limited to 10 meters, so only a small area of ​​the living room or bedroom is interconnected. Recently, the family smart suit launched by Xiaomi's green rice has used Zigbee technology. ZigBee is the communication protocol of the intelligent home control system popular in recent years. The performance is summarized as follows: 1. The data rate is relatively low. In the 2.4 GHz band, only 250 Kb / s, in addition to the channel competition response and retransmission and other consumption, the rate that can be used by the application may be less than 100Kb / s. Therefore, it is not suitable for things like video. 2. In terms of reliability. The physical layer adopts a spread spectrum technology, which can resist interference to a certain extent, and the MAC application layer (APS part) has a response retransmission function. When the ZigBee network is disturbed by the outside world and cannot work normally, the entire network can be dynamically switched to another working channel. 3. Energy consumption characteristics Energy consumption characteristics are a technical advantage of ZigBee. Usually the application data rate carried by the ZigBee node is relatively low. When communication is not required, the node can enter a very low-power sleep state, and the power consumption may be only one thousandth of the normal working state. In general, sleep time accounts for the majority of the total running time, and sometimes the normal working time is less than one percent, thus achieving a high energy saving effect. 4. Networking features. ZigBee's large-scale networking capabilities - 65,000 nodes per network, and only 8 nodes per Bluetooth network, can provide strong support for rich applications. In short, the three wireless transmission technologies of Bluetooth, Wifi and ZigBee are based on their respective technical advantages, thus playing a role in different applications of the Internet of Things. There is no doubt about the competitive relationship between the three. Who will dominate the future, or will there be a fourth technology, and who is going to decide, isn’t it? So what we need to do is to take advantage of it and meet the needs of our own design. Auto Identify Technology - The LENCENT multi usb plug charger would identify the connected devices intelligently and provide optimized charging universal compatibility. 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February 11, 2021