Comparison of Bluetooth, Wi-Fi and ZigBee IoT wireless communication technologies

Bluetooth: Bluetooth (BlueTooth) is a technology for wireless communication between devices, which can realize short-distance data exchange between fixed devices, mobile devices and building personal area network. Bluetooth can connect multiple devices to overcome the data synchronization problem. Bluetooth uses short-baud high-frequency (UHF) radio waves to communicate via the ISM band from 2.4 to 2.485 GHz, with communication distances ranging from a few meters to several hundred meters.

Advantages: Low power consumption and enhanced coverage in "Bluetooth Low Energy" mode, the maximum range can exceed 100 meters

Support for complex networks: optimized for one-to-one connections, and one-to-many connections in star topology, etc.

Intelligent connection: Added support for setting the connection frequency between devices, IPv6 network support.

Higher security: use AES-128 CCM encryption algorithm for data packet encryption and authentication.

The Bluetooth module is small and easy to integrate.

Ad-hoc Connection can be established temporarily: According to the role of the Bluetooth device in the network, it can be divided into a master device and a slave device.

Disadvantages: Bluetooth versions are incompatible and have poor networking capabilities; there are few network nodes and it is not suitable for multi-point deployment.

Comparison of advantages and disadvantages of three common wireless communication technologies connected to the Internet of Things

Wi-Fi: Wi-Fi is a wireless local area network communication technology. The full name is Wireless-Fidelity, wireless fidelity. The IEEE 802.11 standard of the IEEE organization has established the technical standard of Ethernet. Wi-Fi terminal refers to the use of high-frequency radio signals to send and receive data, using the Ethernet communication protocol, the communication distance is usually tens of meters.

Advantages: The advantage of Wi-Fi is that no wires are required for LAN deployment, reducing the cost of deployment and expansion. In addition, according to the Wi-Fi Alliance designation, "Wi-Fi certification" is backward compatible, which specifies a set of globally unified standards: Unlike mobile phones, any Wi-Fi standard device will operate correctly anywhere in the world.

缺点:wi - fi的缺点是里美ted communication distance, poor stability, large power consumption, poor networking capability, and poor security.

Comparison of advantages and disadvantages of three common wireless communication technologies connected to the Internet of Things

ZigBee: It is a low-speed, low-power, short-distance, ad hoc network wireless LAN communication technology. It was formally proposed in 2003. In order to compensate for the high complexity of Bluetooth communication protocols, large power consumption, close distance, and the size of the network is too small. And other defects. The name is taken from bees. Bees rely on the "dance" of flying and "zig" to shake their wings to transmit information about the location of pollen to their peers, and rely on this method to form a communication network in the group. ZigBee is standardized as IEEE 802.15.4, and has three working frequency bands: 868MHz-868.6MHz, 902MHz-928MHz, and 2.4GHz-2.4835GHz. The last frequency band is universal in the world, with 16 channels. Requested radio frequency band. The three bands have transmission rates of 20kbps, 40kbps, and 250kbps.

Advantages: low power consumption, large network capacity, flexible working frequency band.

Disadvantages: low data transmission rate, small effective range, poor anti-interference, ZigBee protocol is not open source, and the connection with the IP protocol is more complicated.