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What is ZigBee and what are the advantages of ZigBee?
Time of issue:
2019-01-29 11:51
Origin：
Zigbee is synonymous with the IEEE 802.15.4 protocol. The technology specified in this agreement is a short-range, low-power wireless communication technology. The name comes from the figure dance of the bee, because the bee (蜜蜂) relies on flying and " The "dance" of flapping its wings zigly transmits information about the location of the pollen with its companions, which means that bees rely on this method to form a communication network in the colony. It is characterized by close proximity, low complexity, self-organization, low power consumption, low data rate, and low cost. Mainly suitable for automatic control and remote control field, can be embedded in various equipment.
Zigbee's own technical advantages
①Low power consumption. In low-power standby mode, two AA batteries can support one node to work for 6 to 24 months, or even longer. This is the outstanding advantage of Zigbee. Compared,
Bluetooth works for weeks, WiFi works for hours.
Now, TI and Germany's Micropelt have jointly launched a new energy Zigbee node. The node uses Micropelt's thermoelectric generator to provide power to TI's Zigbee.
②Low cost. By greatly simplifying the protocol (less than 1/10 of the bluetooth), the requirements for the communication controller are reduced. According to the prediction analysis, based on the 8051 8-bit microcontroller, the full-function master node needs 32KB code, and the sub-function node is less To 4KB code, and Zigbee protocol royalty-free. The price per chip is about $2.
③ Low speed. Zigbee works at a lower rate of 20 to 250 kbps, providing raw data throughput rates of 250 kbps (2.4GHz), 40kbps (915 MHz) and 20kbps (868 MHz), respectively, to meet the application requirements of low-speed data transmission.
④ close distance. The transmission range is generally between 10 and 100 m, and can also be increased to 1 to 3 km after increasing the RF transmission power. This refers to the distance between adjacent nodes. If the relay through routing and communication between nodes, the transmission distance will be farther.
⑤Short delay. Zigbee's response speed is fast, generally only 15ms from sleep to working state, and only 30ms for nodes to connect to the network, which further saves power. In comparison, Bluetooth requires 3 to 10 s, and WiFi requires 3 s.
⑥ High capacity. Zigbee can adopt star, sheet and mesh network structure, and one master node manages several sub-nodes, and one master node can manage 254 sub-nodes at most; at the same time, the master node can also be managed by the upper-layer network node, which can form up to 65,000 sub-nodes. A large network of nodes.
⑦High security. Zigbee provides a three-level security mode, including no security settings, the use of access control lists (ACL) to prevent unauthorized access to data, and symmetric ciphers using the Advanced Encryption Standard (AES 128) to flexibly determine its security properties.
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