“Bluetooth” is a new type of wireless communication technology that can realize short-distance data exchange between personal area networks and mobile devices. Bluetooth communication technology is in fact a global standard, which breaks the use of wired cables to connect various devices. Due to the limitation of this kind of digital equipment, Bluetooth mainly works in the global IS frequency band of 2.4 Hz, which is why Bluetooth is the universal wireless communication technology standard.

Bluetooth has been divided into “Classic Bluetooth”, “Low Energy BLE Bluetooth” and “High-Speed Bluetooth” since version 4.0. Classic Bluetooth includes the old transmission protocol to support the transmission of video and audio. The low energy consumption (BLE) Bluetooth is a subset of version 4.0. Compared with classic Bluetooth, it has a new protocol stack that can be connected quickly and easily. It is mainly used for applications that face extreme power consumption requirements and use a small button battery to supply power. Therefore, Bluetooth Low Energy is very suitable for the needs of IoT applications.

What is WIFI?
The full name of WIFI is Wireless Fidelity, also known as the 802.11b standard. Its biggest advantage is that it allows electronic devices to connect to the local area network and high transmission speed. It usually uses the 2.4G UHF ISM video frequency band. Connecting to the network is generally password-protected. Yes, it is also easy to be cracked by technical means. Therefore, WIFI still needs to continue to improve in terms of safety performance. WIFI communication technology actually converts wired network signals into wireless signals, and uses wireless routers to provide signal technical support to connect mobile phones, tablets, and computers to the Internet.

Bluetooth and WIFI are both wireless communication network standards. The same point is that they all work in the ISM2.4GHz public frequency band.

The difference is that Bluetooth uses the FHSS (Frequency Hopping Spread Spectrum) method, which generally hops 1600 times per second, dividing the 83.5MHz frequency band into 79 frequency band channels, and each time only occupies a 1MHz bandwidth. The modulation method is GFSK (Gaussian Frequency Shift Keying), which can carry out wireless communication of data and voice at the same time.

The communication distance is generally 10 meters. The latest version Bluetooth 4.0 launched in April this year can reach 50 meters. Nowadays, Bluetooth functions can basically be integrated in various digital products, such as mobile phones, headsets, printers, key,boards and mice, cameras, etc., and the scope of use is extremely wide.

The protocol used by wifi is the IEEE802.11b local area network protocol. Its transmission range is 100 meters and the maximum speed can reach 11Mbps. It uses DSSS (Direct Sequence Spread Spectrum) and QPSK or BPSK (Phase Shift Keying), and the bandwidth is 22MHz.

It mainly provides wireless Internet services, so it can often be seen in devices that require wireless mobile Internet access, such as notebooks, PDAs, and smartphones.

Bluetooth communication belongs to WPAN wireless personal area network, namely point-to-point, multipoint-to-multipoint, mainly used to connect some external devices, or for data transmission in short distances. Such as Bluetooth headsets, mobile phones and tablets to transfer files. The bandwidth of Bluetooth transmission is 1Mbps, and the effective distance of transmission is theoretically about 100M.

WIFI is a WLAN wireless local area network that supports simultaneous transmission of multiple terminal devices. The current mainstream wireless product protocols are 802.11b (11b for short), 802.11a (11a for short), and 802.11g (11g for short). While 802.11b uses the 2.4GHz frequency band, the maximum bandwidth is 11Mbps. 802.11a uses the 5.8GHz frequency band with a maximum transmission bandwidth of 54Mbps. 802.11g can also use the 2.4GHz frequency band.

The maximum transmission bandwidth is 54Mbps in normal working mode, and the maximum bandwidth is 108Mbps in super G working mode.

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