Simply put, ZigBee is a highly reliable wireless data transmission network similar to CDMA and GSM networks. The ZigBee data transmission module is similar to a mobile network base station. The communication distance is from standard 75m to several hundred meters, several kilometers, and supports unlimited expansion.
ZigBee is a wireless data transmission network platform consisting of up to 65,000 wireless data transmission modules. Each ZigBee network data transmission module can communicate with each other within the entire network. The distance between each network node can be Standard 75m unlimited expansion.
Different from the CDMA network or GSM network of mobile communication, the ZigBee network is mainly established for industrial field automation control data transmission. Therefore, it must be simple, easy to use, reliable in operation and low in price. The mobile communication network is mainly established for voice communication. The value of each base station is generally more than one million yuan, and each ZigBee "base station" is less than 1,000 yuan.
Each ZigBee network node can not only be used as a monitoring object, for example, the Sensors connected to it directly collect data and monitor data, and can also automatically transfer data data transmitted by other network nodes. In addition, each ZigBee network node (FFD) can also be wirelessly connected to multiple isolated child nodes (RFDs) that do not undertake network information relay tasks within the scope of their own signal coverage.
1. Low power consumption: Due to short duty cycle, low power consumption of transceiver information, and sleep mode in RFD, zigbee technology ensures that two AA batteries support up to 6 months to 2 years of operation time on the RFD. ;
2. High reliability: The collision avoidance mechanism is adopted, and special time slots are reserved for communication services requiring a fixed bandwidth, thereby avoiding competition and conflicts when transmitting data. The MAC layer adopts a fully acknowledged data transmission mechanism, and each transmitted data packet must wait for the acknowledgement information of the receiver;
3. Low cost: the module is inexpensive, and the zigbee agreement is free of patent fees;
4. Low latency: Optimized for latency-sensitive applications, communication latency and latency from sleep activation are very short. The device search delay is typically 30 ms, the sleep activation delay is typically 15 ms, and the active device channel access delay is 15 ms.
5. Low data volume: zigbee data transmission rate of each network module RF front end is 250kbps;
6. The network capacity is large: zigbee can adopt star, cluster-tree, and mesh structure networking, and can form a larger network structure through any node connection. In theory, it can connect up to 65,000 nodes. A zigbee network can accommodate up to 254 slave devices and one master device, and up to 100 zigbee networks can exist simultaneously in a single zone;
7. High confidentiality: zigbee provides packet integrity check and authentication based on cyclic redundancy check (CRC). The encryption algorithm uses AES-128, and each application can flexibly determine its security attributes.
8. Global versatility and openness: Thanks to the zigbee standard protocol, communication problems between individual zigbee devices will be a breeze.
In general, applications that meet one of the following conditions can be considered for wireless transmission using Zigbee technology:
1. There are many outlets that need data collection or monitoring;
2. The amount of data required to be transmitted is not large, but the equipment cost is low; Requires high data transmission and high security;
4. The device is small in size and it is inconvenient to place a large rechargeable battery or power module; Battery powered;
6. The terrain is complex, there are many monitoring points, and a large network coverage is required. Coverage blind area of ​​existing mobile networks;
8. A telemetry remote control system that uses an existing mobile network for low data transmission.
9. Use a local area to move the target's positioning application with poor GPS performance or cost.
In the industrial field, the use of sensors and ZigBee networks makes data acquisition, analysis and processing easier, and can be an important part of decision support systems. For example, the detection of hazardous chemical components, early monitoring and forecasting of fire alarms, detection and maintenance of high-speed rotating machines, remote meter reading, etc. These applications do not require high data throughput and continuous status updates, with a focus on low power and flexible networking to maximize battery life and reduce maintenance costs on ZigBee networks.
In the medical field, information on the blood pressure, body temperature and heart rate of each patient can be accurately and factarily detected by means of various sensors and ZigBee networks, thereby reducing the workload of doctors' ward rounds and helping doctors to make the quickest response. Especially for the monitoring and treatment of critically ill and critically ill patients.
In the field of intelligent buildings, ZigBee sensors can be used for lighting control, sensors are used to detect the surrounding environment, and the lighting switch is turned on only when a person is detected. The system can also be centrally controlled via the ZigBee network.
In the field of home automation, ZigBee can be used in security systems, temperature control devices and more. In addition, the advantage of using ZigBee for a remote control device is that it is not limited by the angle of the infrared device currently used. And ZigBee supports a variety of network structures, making it easier to extend coverage. At the same time, due to the low power consumption of the ZigBee device, the battery life is similar to that of the infrared device. In the design of the wireless home gateway, ZigBee is used in the home intranet to control home appliances.
In addition, due to the low latency of ZigBee, ZigBee can be used for peripherals of PCs. For example, wireless gaming pads or handles with feedback can take advantage of ZigBee's low-latency features and performance as wired controllers.
Some Zigbee applications:Mine positioning system
Campus LED advertising screen network description
Intelligent community management system
Rail transit construction personnel wireless management system
Computer room environment monitoring system
Freight terminal dispatching system
Freight yard real-time information management system
Bank vault management system
Urban street light measurement and control system
Large hospital application program
Wireless meter reading system
Water treatment monitoring system
Intelligent sentry safety detection system
Warehouse intelligent management system
Wireless well monitoring transmission system
Application of wireless data transmission module in traditional RFID industry
Smart Prison Wireless Management System
Power system application
Intelligent vehicle management system
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