Wireless war will erupt WIFI Bluetooth competing smart home

The discovery of electricity has brought too much convenience to people's lives, such as lighting up the dark night, extending the shelf life of food, enriching the family entertainment life and so on. With the development of technology, the concept of intelligence has also been introduced into the traditional home market, and new technological transformations have been carried out on household products that people are accustomed to.

Bluetooth technology

Bluetooth is a radio technology that supports short-range communication (typically within 10m) of the device. Wireless information exchange between mobile phones, PDAs, wireless headsets, laptops, related peripherals, etc. With "Bluetooth" technology, communication between mobile communication terminal devices can be effectively simplified, and communication between the device and the Internet Internet can be simplified, so that data transmission becomes more rapid and efficient. Bluetooth uses a decentralized network structure and fast frequency hopping and short packet technology to support point-to-point and point-to-multipoint communication, working in the global 2.4GHz ISM (ie, industrial, scientific, medical) frequency bands. Its data rate is 1Mbps. Full-duplex transmission is achieved using a time division duplex transmission scheme.

Bluetooth technology was originally created by Ericsson. On May 20, 1999, industry leaders such as Sony Ericsson, IBM, Intel, Nokia and Toshiba established the Bluetooth Special Interest Group to develop Bluetooth technology standards. In 1998, Ericsson hoped that wireless communication technology would be able to unify the standard and name it "Bluetooth."

The characteristics of Bluetooth technology can be summarized as follows: Globally applicable, can transmit voice and data at the same time, can establish temporary peer-to-peer connection (Ad-hoc Connection), has good anti-interference ability, Bluetooth module is small Easy integration, low power consumption, open interface standards, and low cost.

WiFi technology

WiFi (Wireless Fidelity), the IEEE 802.11 protocol, is a short-range wireless transmission technology that supports Internet access to radio signals in hundreds of feet. The first version of WiFi was published in 1997, which defines the medium access control layer (MAC layer) and the physical layer.

The basic network structure and basic transmission medium of the WLAN are specified, and the characteristics of the physical layer (PHY) and the medium access layer (MAC) are standardized. The physical layer uses infrared, DSSS (direct sequence spread spectrum) or FSSS (frequency modulation spread spectrum) technology. In 1999, the IEEE 802.11a and IEEE 802.11g standards were added. Its transfer rate is up to 54 Mb/s. Can support a wide range of services such as data, images, voice and multimedia.

The GFCI will not protect you from line contact hazards (i.e. a person holding two "hot" wires, a hot and a neutral wire in each hand, or contacting an overhead power line). However, it protects against the most common form of electrical shock hazard, the ground-fault. It also protects against fires, overheating, and destruction of wire insulation.

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