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: Global application, simultaneous transmission of voice and data, establishment of a temporary peer-to-peer connection (Ad-hoc ConnecTIon), 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.
WiFi technology advantages: wide coverage of radio waves, fast transmission speed of WiFi, health and safety, WiFi applications are now very common, more and more electronic products supporting WiFi, such as mobile phones, MP4, computers, etc., have basically become The mainstream standard configuration.
There are two main disadvantages of wifi: one is limited coverage; the other is poor mobility.
Smart home industry or into the popular field of Bluetooth
Recently, we have seen a lot of Bluetooth in the field of smart home. Compared with WiFi, which has covered the trend of the north and south in recent years, Bluetooth seems to be a bit lonely. In fact, probably four or five years ago, WiFi was far from popular, and Bluetooth is still the main way of file transfer between mobile phones. I remember that in the era of Nokia S60, it was very common to transfer a photo and a music between friends and Bluetooth, and the transmission speed of Bluetooth itself was very fast. It was also convenient to use, basically not affected by the environment, as long as The two devices are connected to Bluetooth and are widely used.
Today, Bluetooth-enabled devices are everywhere. In fact, Bluetooth is a common communication method in life. Compared with ZigBee, Z-wave, WiFi and other technologies in the smart home, "Bluetooth is a mainstream communication technology for wireless smart home." Bluetooth technology has been widely used, and products integrating the technology include mobile phones, computers, headphones, speakers, automobiles, medical equipment and so on.
As we all know, Bluetooth is a peer-to-peer communication method that supports short-range communication (typically within 10m, Bluetooth 4.0 extends to 100m) radio technology, including mobile phones, PDAs, wireless headsets, notebook computers, related peripherals, etc. Wireless information exchange between devices. The use of "Bluetooth" technology can effectively simplify the communication between mobile communication terminal devices, and can also successfully simplify the communication between the device and the Internet, thereby making data transmission more rapid and efficient, and broadening the road for wireless communication. The design scheme of smart home based on Bluetooth technology can make data collection and home security monitoring flexible and convenient, and get rid of the constraints of the wiring system. At the same time, the frequency hopping technology of Bluetooth improves the anti-interference ability of the system to some extent.
In addition, the Bluetooth device is small and easy to carry, so in the smart home field, Bluetooth technology is more suitable for some close-range private use devices, such as smart bracelets, smart watches, smart scales and so on.
Unlike mainstream smart home companies such as IoT Sensing and ZigBee, Bluetooth technology is clearly better at small devices that are “single-handedâ€. Bluetooth technology can be directly placed into a small-sized smart home device, especially after the improvement in security, energy consumption, etc., it is also used in many smart home items.
In addition, for smart homes, the biggest difference between Bluetooth technology and other wireless charging solutions is its ability to identify. For example, when you walk into a coffee shop and charge your mobile phone on a wireless charging device on the desk, the cafe's system can determine who is the phone and which seat it is using your Bluetooth ID. This means you can complete ordering and payment with your mobile phone without leaving your seat.
Of course, the Bluetooth smart is not perfect - although its transmission distance can reach 60 meters, but the premise is that the chip manufacturers provide enough support, for example, the opponent mobile phone device, the distance is basically limited to 10 meters ~ Within 30 meters. In addition, if the amount of data is large, the transmission efficiency of Bluetooth Smart is somewhat delayed and takes a long time. Others, such as channel compatibility, reliability and security, leaking events are very common, can not achieve true "roaming", no network self-healing function, for the wireless network-based smart home will greatly reduce equipment operation Efficiency, and Bluetooth anti-interference ability is poor. In addition, due to its short transmission distance and relatively low network carrying capacity, the new standard networking size can not exceed 300, so it is not suitable for building a large home network. This is the next problem that needs to be solved.
A Phone Screen Protector is an accessory for cell phones, Pads, tablet computers, and other devices that protects the screen and keeping your screen intact.
phone screen protector preserves your screen from scratches that can happen in everyday encounters, not to mention the rough and tumble environment of your bag. You can feel confident knowing your shield may take a beating, but your phone's screen will remain as smooth and clean as the day you bought it .
iPhone 6 plus screen protector makes your lovely iPhone 6 plus Screen Clean and Pristine. It can prevents oils from adhering to your screen which means smudges and fingerprints wipe away easily.
You can get glass phone screen protectors made out of tempered glass. Like with any technology, they have their own pros and cons.
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