Zigbee technology is a wireless communication technology applied to short distance and low speed. In the past, Zigbee was also called "HomeRF Lite" and "FireFly" technology, and now it is called Zigbee 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 of periodic data, intermittent data and low reaction time data transmission.
Each ZigBee network node can not only be used as a monitoring object, for example, its connected sensors can directly collect and monitor data, but also can automatically transmit data from other network nodes. In addition, each ZigBee network node (FFD) can also wirelessly connect a number of isolated child nodes (RFD), which do not undertake the task of network information transmission within their own signal coverage.
The main characteristics of zigbee
(1) Low power consumption: Because the transmission rate of ZigBee is low, the transmission power is only 1mW, and the power consumption is low in sleep mode, ZigBee equipment is very energy-saving. It is estimated that ZigBee devices can last for 6 months to 2 years with only two No.5 batteries, which is beyond the reach of other wireless devices.
(2) Low cost: The initial cost of ZigBee module is about US$ 6, and it is estimated that it will soon drop to US$ 1.5-2.5. The ZigBee protocol is free of patent fees. Low cost is also a key factor of ZigBee.
(3) Short delay: the delay of communication and activation from dormant state is very short. The typical delay of searching device is 30ms, the delay of dormant activation is 15ms, and the delay of access to active device channel is 15ms. Therefore, ZigBee technology is suitable for wireless control applications with strict requirements on time delay.