ZigBee technology is a short-range, low-complexity, low-power, low-speed, low-cost two-way wireless communication technology. It is mainly used for data transmission between various electronic devices with short distance, low power consumption and low transmission rate, as well as typical applications with periodic data, intermittent data and low response time data transmission.
(1) Low power consumption: In low-power standby mode, two AA dry batteries can support one node working for 6-24 months, or even longer. This is the outstanding advantage of ZigBee. In comparison, Bluetooth can work for weeks and WiFi can work for hours;
(2) Low cost: Reduce costs by greatly simplifying the protocol (less than 1/10 of Bluetooth), and also reduce communication control Based on predictive analysis and calculated based on the 8051 8-bit microcontroller requirements, a full-function master node requires 32KB of code, and sub-function nodes require as little as 4KB of code, and the ZigBee protocol patent is free;
( 3) Low rate: ZigBee works at a communication rate of 250kbps, meeting the application requirements for low-rate data transmission;
(4) Short range: The transmission range is generally between 10 and 100m. When increasing RF transmission After power, it can also be increased to 1-3km, which refers to the distance between adjacent nodes. If the relay of communication between routing and nodes is used, the transmission distance will be further;
(5) Short delay: ZigBee has a fast response speed. Generally, it only takes 15ms to switch from sleep to working state. It only takes 30ms to connect to the network, further saving power. In comparison, Bluetooth takes 3-10s and WiFi takes 3s;
(6) High capacity: ZigBee can adopt star, slice and mesh network structures, with one master node managing several sub-nodes, up to One master node can manage 254 sub-nodes; at the same time, the master node can also be managed by the upper layer of network nodes, which can form a large network of up to 65,000 nodes;
(7) High security: ZigBee provides three levels of security Mode, including no security settings, using access control lists (ACL) to prevent illegal acquisition of data, and using symmetric passwords of the Advanced Encryption Standard (AES128) to flexibly determine its security attributes;
(8) Free of charge Licensed frequency band: Direct sequence spread spectrum is used in the industrial, scientific and medical 2.4GHz (global) frequency band.