Wireless protocol for Mijia smart socket, Keywords: Wi-Fi and Zigbee

[Guide]Mijia smart sockets are divided into Wi-Fi version, ZigBee version, normal version and enhanced version. According to the wireless protocol, these four sockets can be simplified into two categories: Wi-Fi version, ZigBee version, because the regular version, enhanced version and Wi-Fi version use the Wi-Fi version of the wireless protocol, and the ZigBee version uses ZigBee wireless protocol.

With the development of technology, the concept of Smart Home is deeply rooted in people’s minds, and people use their wisdom to live an innovative life. Bill Gates is the first user of smart homes. Maybe many people think that the high-end of smart homes is in line with people like Bill Gates who have “money”. Actually, with the popularity of Wi-Fi and the development of 5G. Smart home slowly enters the public’s field of vision, and you can start your smart home life with just a smart socket or speaker.

What exactly is Wi-Fi and ZigBee?

First, Wi-Fi and ZigBee are two different wireless protocols. Wi-Fi wireless protocol: Full name Wireless Fidelity, also known as 802.11b standard, also known as WIFI or WLAN function. ZigBee wireless protocol: also known as ZigBee, is a wireless network protocol for low-speed short-distance transmission. The bottom layer is the media access layer and physical layer using IEEE 802.15.4 standard specification. So what is the difference between the Wi-Fi version and the ZigBee version of the wireless protocol on the Mijia smart socket?

Depends on the network

Wi-Fi wireless protocol: Supports the control of home appliances through the Mijia APP. The problem is that if the home is disconnected, the control function is invalid. ZigBee wireless protocol: It also supports the control of home appliances through the Mijia APP, and the home can still be used normally after the network is interrupted.

Power Problems

In addition to whether or not networking will affect the presence, there is a big difference between the two. Wi-Fi has high power consumption. Unplugged devices, such as doors and windows, human sensors, etc., have built-in batteries for power supply. If the power consumption is high, it needs to be recharged or replaced frequently, which will cause trouble and bad for the user. Experience, in contrast, ZigBee’s power consumption is low, in the low-power standby mode, only 2 5th dry battery can support 1 node for 6 to 24 months, or even longer, while Wi-Fi can only Working for hours, this is ZigBee’s outstanding advantage, which is very consistent with low power requirements.

Transmission rate

ZigBee has a low transmission rate of only 1mW and provides 250 kbps (2.4GHz) and 40kbps (915 MHz) respectively. And raw data throughput of 20kbps (868 MHz), and it uses sleep mode, which is why ZigBee devices are very power efficient. In contrast, Wi-Fi has a much higher transmission rate and is the fastest transmission technology, up to 11 Mbit/s.

Propagation distance

Wi-Fi, like ZigBee, is a short-range wireless technology used in offices and homes. ZigBee technology mainly uses 2.4GHz in the ISM band, has weak diffractive ability, weak wall penetration capability, is susceptible to obstacles, and has a short propagation distance. The general effective propagation distance is 10-75m, which is mainly suitable for small office areas and home use. . In the same 2.4GHz frequency band, Wi-Fi uses radio wave transmission to realize point-to-point wireless communication between the base station and the terminal, and the link layer adopts the Ethernet protocol as the core to realize the addressing and verification of information transmission, and the transmission range is wide. Covering up to 100m, it can even cover the entire building.

Network capacity

With the development of smart homes, there will be more and more smart appliances in the home. After the equipment is more, the load on the router will be very large. Wi-Fi bandwidth is required to use the Wi-Fi protocol, while Wi-Fi can be connected to a limited number of devices. The average home router can carry about 16 or so. ZigBee protocol does not need to occupy Wi-Fi resources, and has large-scale networking capabilities. ZigBee can adopt star, patch and mesh network structure. One master node manages several child nodes, and at most one master node can manage 254 children. The node can also be managed by the upper layer network node, which can form a large network of 65,000 nodes. Each network supports 65,000 nodes and can carry more than 100 devices. With the continuous development of smart homes, switches, The number of lighting and home appliances will definitely be far more than 16. WiFi has considerable limitations.

Cost issues

For a product, the cost issue cannot be ignored. ZigBee has reduced the requirements for communication controllers by greatly simplifying the protocol, and the ZigBee protocol-free royalty is about $2 per chip. Wi-Fi chips have higher hardware requirements. Common Wi-Fi is RF front-end plus baseband. All protocol stacks need to be completed on the host MCU/CPU, and most MCU/CPUs need to run Linux. So it’s a two-chip solution, and the single-chip Wi-Fi solution is costly and scary, about $7 to $10.

The Wi-Fi protocol and the ZigBee protocol each have their own advantages and disadvantages. It is not very meaningful to force the two to compete. Only by combining the needs of the products can you choose the most. The right technology.

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