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Introduction to ZigBee Technology
ZigBee is an emerging short-range, low-power, low-data-rate, low-cost, and low-complexity wireless network technology.
Takes all the advantages stipulated by IEEE802.15.4’s powerful wireless physical layer: power saving, simple, and low-cost specifications; ZigBee adds logical network, network security and application layers.
The main application areas include industrial control, consumer electronic equipment, automotive automation, home and building automation, medical equipment control, etc.
Topology of ZigBee
ZigBee device type
Coordinator
The coordinator is responsible for starting the entire network. It is also the first device on the network. The coordinator selects a channel and a network ID (also called PANID, or PersonalAreaNetworkID), and then starts the entire network.
Router
Allow other devices to join the network, multi-hop routing and assist the communication of its own sub-terminal devices.
End-Device (terminal device)
The terminal device has no specific responsibility for maintaining the network structure. It can sleep or wake up, so it can be a battery-powered device.
ZigBee features
1. Low data transmission rate: 10KB/sec-250KB/sec, focusing on low-speed transmission applications.
2. Low power consumption: In low-power standby mode, two ordinary AA batteries can be used for 6-24 months.
3. Low cost: ZigBee® has low data transmission rate and simple protocol, so the cost is greatly reduced.
4. Large network capacity: The network can accommodate up to 65,000 devices.
5. The network has strong self-organization and self-healing capabilities and reliable communication.
6. Data security: ZigBee™ provides data integrity checking and authentication functions, and uses the AES-128 encryption algorithm.
7. Flexible working frequency band: The frequency bands used are 2.4GHz, 868MHz (Europe) and 915MHz (USA), all of which are license-free (free) frequency bands.
ZigBee network system composition frame diagram
ZigBee series product type
1. ZigBee remote control
Equipment type: terminal equipment
Function: Control the devices that have been coded with it in the network, and display the device status in real time. Adopt a new type based on IEEE802.15.42.4GHzRFMCU and the latest ZigBee2007/Pro protocol stack to control the ZigBee series of power sockets, smart and dimmer switches, electric curtains, and cooperate with ZigBee infrared forwarding equipment to control all electrical equipment in the home, replacing the original The remote control can query and display the current status of the device in real time, using touch buttons, rotating dimming, controlling the volume, and vibrating to wake up.
Operation: store single control code matching information
Menu selection to switch language
Menu prompt for code matching and control process status
Touch key area for code matching and device control
Five-way key device switching, menu operation
Mechanical sliding key dimming and volume adjustment
2. ZigBee infrared transponder
Function: Receive commands from the gateway or remote control to realize the forwarding of wireless codes to infrared codes, so that home appliances can be controlled wirelessly.
Operation: Before use, you need to code with the gateway or coordinator and the infrared remote control of home appliances
3. ZigBee one-button dimmer switch
Device type: router
Function: Receive gateway or remote control instructions for light control, switch and dimming, and feedback on the implementation
Operation: Before operation, you need to perform single control and scenario code matching operations with the gateway and remote control, and the scenario code information will be stored
4. ZigBee two-key smart switch
Device type: router
Function: Receive gateway or remote control instructions for single control or scene control, and feedback on the execution
Operation: Before operation, you need to perform single control and scenario code matching operations with the gateway and remote control, and the scenario code information will be stored
5. ZigBee curtain controller
Device type: router
Function: Receive gateway or remote control instructions for curtain switch control, and feedback on the implementation
Operation: Before operation, you need to perform single control and scenario code matching operations with the gateway and remote control, and the scenario code information will be stored
6. Socket-Coordinator
Device type: router
Function: The socket coordinator is integrated into one device, providing a toggle switch to switch the device type; if there is no gateway, it is switched to the coordinator device, otherwise it is used as a normal switch
Operation: Before operation, you need to perform single control and scenario code matching operations with the gateway and remote control, and the scenario code information will be stored
7. Other ZigBee products
ZigBee external control module
USB, RS485 communication
Topology diagram of Zigbee smart home system
The ZigBee smart home is designed and installed as a family unit, and each family is equipped with a home gateway and several wireless communication ZigBee sub-node modules. A wireless network transceiver module (a product of the ZigBee technical standard symbol) is connected to the home gateway and each child node. Through these wireless network transceiver modules, data is transmitted between the gateway and the child nodes.
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