The Internet of Things is the combination of almost all technologies and computers and the Internet at present, realizing the real-time sharing of environment and information state and the intelligent collection, transmission, processing and execution of objects and objects, that is, the application of information technology. Can be included in the scope of the Internet of Things, then what are the ways to connect the Internet of Things with computers and Internet technologies? Today we will discuss the communication methods that can help the Internet of Things connect to computers and Internet technologies.
ã€Bluetooth】Bluetooth: A standard for wireless technology that enables short-distance data exchange between fixed devices, mobile devices, and building personal area networks. It has become very important in computers and many consumer markets, and this is also wearable. The key to the product, especially the connection to the Internet of Things, the new Bluetooth Low Energy (BLE) or Bluetooth Smart is an important protocol for IoT applications.
For example, Ding Yi Hong Ji & Wan Cool Electronics is a wearable scanning device that uses Bluetooth to connect.
Devices using Bluetooth Smart include basic data rates for baseband and protocol stacks, and Bluetooth specification versions for low-energy core configurations. The Bluetooth core specification provides two or more piconet connections to form a distributed network. Specific devices automatically play the role of master-slave in these piconets, forming a small IoT transmission system.
[WIFI]
WIFI is a technology that allows electronic devices to connect to a wireless local area network (WLAN), typically using 2.4G UHF and 5G SHF ISM radio frequency bands. Connecting to a wireless LAN is usually password protected, but it is also open so that devices in any WLAN range can be connected. WIFI connections are often an obvious choice for many developers, especially considering the popularity of WIFI in a LAN home environment. Currently, the most common WIFI standard used in homes and businesses is 802.11n, which provides tight throughput at hundreds of megabits per second, which is good for file transfers, but for many IOT applications More power consumption.
[carrier]The carrier can be modulated to force some of its characteristic quantities to change with the characteristic value of one signal or the characteristic of another oscillation, usually a periodic electrical oscillation wave.
The carrier is divided into a communication carrier and a power carrier.
Communication carrier: A wave generated by an oscillator and transmitted on a communication channel. It is modulated to transmit voice and other information. The carrier frequency is usually higher than the frequency of the input signal. The input signal is modulated onto a high-frequency carrier. Take a train of high-speed rail or a plane, then be launched and received. The carrier can be a sine wave or a non-sinusoidal wave (such as a periodic pulse sequence). The carrier is modulated and called a modulated signal, which contains the full-wave characteristic of the modulated signal. Generally, the frequency of the sinusoidal carrier is much higher than the bandwidth of the modulated signal, otherwise aliasing will occur and the transmitted signal will be distorted.
Communication carriers are mainly used for information transmission between telephones and digital satellites.
Power carrier: Power carrier communication and cable system communication in telecommunication system are no different in principle. Instead, the power line is used instead of the overhead line. However, multiplexing communication on the power line is not as simple as overhead line, not only to ensure the safety of personal equipment. Moreover, it is necessary to obtain the best carrier signal transmission efficiency, which requires processing the power line to solve the connection problem between the power line and the carrier device. That is to say, the power carrier is a technology that uses an existing power line to transmit analog or digital signals at high speed through a carrier wave, and is mainly applied to control of smart homes, remote meter reading, and remote street lights.
However, since the power carrier transmits data through the power line, it is susceptible to interference. For example, the power line itself has impedance attenuation and pulse interference. The carrier signal is attenuated by the transformer to 60dB, and the carrier signal cannot be cross-phase. The cross-phase attenuation is more obvious. Therefore, the current carrier can only be used in one station. Each station is equipped with a GPRS module to transmit data to the telecommunications office.
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