How much do you know about Zigbee wireless connectivity?
Zigbee is a brand new wireless connection on smart home terminals. How much do you know about it? Today, the author will explain Zigbee.
Zigbee has a wide range of applications, operating in the 2.4GHz, 868MHz and 915MHz bands, with transmission rates up to 250kbit/s, 20kbit/s and 40kbit/s, and can be transmitted at 10-75m. Within the scope, but can continue to increase.
Because Zigbee's transmission rate is low, the transmit power is only 1mW, and the sleep mode is adopted, the power consumption is low, so the zigbee device is very power-saving. It is estimated that Zigbee equipment can last up to 6 months to 2 years with only two 5th batteries, which is beyond the reach of other wireless devices. The initial cost of the Zigbee module is around $6, and it is estimated that it will soon drop to $1.5-2.5, and the Zigbee agreement is royalty-free. Low cost is also a key factor for Zigbee.
The size of the Zigbee protocol is generally 4-32KB, while Bluetooth and wi-fi generally exceed 100KB. Both the communication delay and the delay from the sleep state are very short. The typical search device delay is 30ms, the sleep activation delay is 15ms, and the active device channel access delay is 15ms. Therefore, zigbee technology is suitable for wireless control applications where time delay is critical.
A star-shaped Zigbee network can accommodate up to 254 slave devices and one master device. Up to 100 Zigbee networks can exist simultaneously in a single area, and the network composition is flexible. And up to 65,000 nodes can be connected in a network. Zigbee is able to automatically build the network it wants. A collision avoidance strategy is adopted, and dedicated time slots are reserved for communication services requiring a fixed bandwidth, avoiding competition and collision of transmitted data. The MAC layer uses a fully acknowledged data transmission mode, and each transmitted packet must wait for the acknowledgement from the receiver. If there is a problem during the transfer, you can resend it. A packet integrity check function based on cyclic residual check (CRC) is provided to support authentication and authentication. The AES-128 encryption algorithm is adopted, and each application can flexibly determine its security attributes.
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