"Bluetooth" is a new type of wireless communication technology, which can realize short-distance data exchange between personal area network and mobile equipment. Bluetooth communication technology is actually a global standard, which breaks the connection with wired cable. The limitation of digital devices, Bluetooth mainly works at 2.4 Hz global IS band, which is why Bluetooth is the standard of wireless communication technology.
Since the 4.0 version, Bluetooth has been divided into "Classic Bluetooth", "Low Power BLE Bluetooth" and "High Speed ​​Bluetooth". Classic Bluetooth includes the old transmission protocol to support video and audio transmission. Low-Power (BLE) Bluetooth is a subset of version 4.0. Compared to Classic Bluetooth, the new protocol stack can be quickly and easily connected. It is mainly used in the face of power consumption requirements, with small button battery powered applications. So low-power Bluetooth is very suitable for the needs of IoT applications.
The full name of WIFI is Wireless Fidelity, also known as 802.11b standard. Its biggest advantage is that it can allow electronic devices to connect to LAN and high transmission speed. It usually uses 2.4G UHF ISM video frequency band. Generally, it is password protected when connected to the network. It is also easy to be cracked by technical means. Therefore, WIFI needs to continue to improve in terms of security performance. WIFI communication technology actually converts wired network signals into wireless signals, and uses wireless routers to provide signal technology support to realize connection of mobile phones, tablets, and computers.
Both Bluetooth and WIFI are standards for wireless communication networks.
Their similarities are all working in the ISM 2.4 GHz public band.
The difference is that Bluetooth uses FHSS (Frequency Hopping Spread Spectrum) mode, which generally hops 1600 times per second, and divides the 83.5MHz frequency band into 79 frequency band channels, each time occupying only 1MHz bandwidth. The modulation method is GFSK (Gaussian Frequency Shift Keying), which can perform wireless communication of data and voice at the same time. The communication distance is generally 10 meters. The latest version of Bluetooth 4.0 launched in April this year can reach 50 meters. Bluetooth functions can now be integrated into various digital products, such as mobile phones, earphones, printers, keyboards, cameras, etc., and are used in a wide range of applications.
The protocol used by wifi is IEEE802.11b LAN protocol. Its transmission range is 100 meters and the maximum speed can reach 11Mbps. DSSS (straight sequence spread spectrum) and QPSK or BPSK (phase shift keying) are used. The bandwidth is 22MHz. . The main offer is the wireless Internet service, so it can often be seen in devices that need wireless mobile Internet access, such as notebooks, PDAs, smart phones, etc.
Bluetooth communication belongs to the WPAN wireless personal area network, that is, point-to-point, multi-point to multi-point, mainly used to connect some external devices, or to transmit data at close range. For example, Bluetooth headsets, mobile phones and tablets transfer files. The bandwidth of Bluetooth transmission is 1Mbps, and the effective distance of transmission is theoretically about 100M.
WIFI is a network mode that belongs to a WLAN wireless LAN and supports simultaneous transmission of multiple terminal devices. At present, the mainstream wireless product protocols are 802.11b (referred to as 11b), 802.11a (referred to as 11a), and 802.11g (referred to as 11g) standard protocols. 802.11b uses the 2.4GHz band with a maximum bandwidth of 11Mbps. 802.11a uses the 5.8 GHz band with a maximum transmission bandwidth of 54 Mbps. 802.11g can also use the 2.4GHz band. The maximum transmission bandwidth is 54Mbps in normal normal operation mode, and the maximum bandwidth is usually 108Mbps in super G mode.
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