Talk about smart home wireless technology

Nowadays, smart home has been upgraded from wired transmission to wireless communication, and four kinds of wireless technologies are available to choose from. There is no need to break the wall wiring. As long as it is combined according to their own needs, the system is automatically networked, and the expansion performance is strong. It can be embedded in any household equipment. Updates and upgrades; problems can also be diagnosed and repaired in time.

Bluetooth technology

Everyone is familiar with Bluetooth technology, I am afraid it is a Bluetooth function on the phone. The power consumption and cost are both between wifi and zigbee, but the transmission distance is the shortest and it belongs to a point-to-point, short-distance communication mode. Because it is transmitted between mobile devices or a short distance, the Bluetooth product will provide some more Personalized use experience, such as Bluetooth headsets, Bluetooth speakers, smart scales, etc., due to its short transmission distance, it is not suitable for the formation of a huge home network.

Zigbee technology

First of all, the security of zigbee technology is very high, and so far there is no global precedent for hacking. Its security stems from its systematic design: adopts aes encryption (advanced encryption system), which is about 12 times more rigorous than that of bank card encryption technology; secondly, zigbee uses honeycomb structure networking, and each device can pass through multiple directions. Communication with the gateway provides high network stability. In addition, its network capacity theoretical nodes are 65,300, which can meet the needs of home network coverage. Even intelligent communities, smart buildings, etc. can still fully cover; Finally, zigbee has the ability to communicate in both directions, not only Can send commands to the device, and the device will also feedback the execution status, which is very important to the terminal experience, especially the security equipment. If you click close, but do not know whether the door is really locked, it will bring To how much security risk; In addition, zigbee uses a very low power design, can be fully battery-powered, in theory, a battery can be used for more than 10 years, both energy-saving and environmentally friendly.

Zwave technology

The data transmission rate of zwave is 9.6kbps. The effective coverage of the signal is 30 meters in the room (outdoor is greater than 100 meters). It is suitable for narrow bandwidth applications and has a certain degree of security and stability. However, it is currently only used in home automation. There are three shortcomings: First, fewer nodes, the theoretical value of 256, the actual value may be only about 150, is considered to be able to accommodate the upper limit of the number of devices, in fact, many manufacturers can accommodate 20 to 30 devices is good The second is the tree network structure. Once the upper end of the branch is broken, all devices at the lower end will be unable to communicate with the gateway. Third, there is no encryption method, which is of poor security and is vulnerable to attacks. (The frequency band used by zwave is non-civilian in China, domestically. Unusual zwave smart home, more or in foreign countries).

Wifi technology

Smart home products based on wifi technology are the most common. Their advantages lie in their high transmission speed, low product cost and most popular life. For users, wifi-based smart home combination is the most convenient way to purchase equipment directly.

There are two sides in everything, although wifi is fast and widely used, it also has its own technical disadvantages: its biggest problem is very low security and weak wireless stability; its large power consumption is also one of its weaknesses, which will lead to its The application in the home field is limited. For example, smart door locks, infrared relay controllers, and various sensors are not suitable for use. In addition, the networking capability of wifi is relatively low. At present, the actual size of a wifi network is generally not more than 16 devices. However, in the actual home environment, the number of switches, lighting, and home appliances alone is far more than 16. Obviously, the development space has been limited.

Looking at the world, "Wireless replaces cable" is a general trend. Nowadays, people only need to be in a wifi environment, or turn on the device's Bluetooth function, and they can easily transfer data to each other. On the other hand, the continuous development of wireless technology has brought new opportunities for development in the field of home networking, and home automation (smart home) has become an arena for advanced wireless technologies.