In recent years, the price of wireless modules has also shown an upward trend, due to the hot market, coupled with the requirements of raw materials continue to improve, the wireless module also followed the rise, but still very popular with the public. Especially in the field of intelligent science and technology, wireless module has just become a high-tech products, will drive the rapid development of science and technology and electronics industry. Wireless modules in remote control, telemetry, wireless remote control systems, security and fire prevention systems, small wireless networks, industrial data acquisition systems, wireless crane scale, wireless electronic scales, vehicle monitoring, non-stop charging, parking lot management, wireless tags, identification, biological signal acquisition, hydrological and meteorological monitoring, robotics control, digital audio transmission and so on will be involved.
Wireless communication module program introduction
Wireless communication module is the key link connecting IOT perception layer and network layer, belonging to the bottom hardware link, with its irreplaceable, wireless communication module and IOT terminal there is a one-to-one correspondence. Wireless module is divided into “communication module” and “positioning module” according to its function. Relatively speaking, the communication module has a wider range of applications, because not all Internet of Things terminals need to have a positioning function. Wireless communication module makes all kinds of Internet of things terminal equipment with networking message transmission capability, is all kinds of intelligent terminal to access the Internet of things message entrance.
It is a key link between the Internet of things perception layer and network layer, all the Internet of things perception layer terminal device data needs to be converged to the network layer through the wireless communication module, and then through the cloud management platform for remote control of equipment, and at the same time after the analysis of data, to bring about the improvement of management efficiency.
Second, the advantages of wireless communication module
Comparatively speaking, the wireless data transmission module to establish a dedicated wireless data transmission method than other methods have the following advantages, the following describes the DATA-6106 wireless data transmission module to establish a dedicated wireless data transmission method compared to the advantages of wired communications.
1, the cost is cheap
The establishment of wired communications must be set up cable, or digging cable trench, so it requires a lot of manpower and material resources; and the establishment of a dedicated wireless data transmission using wireless data transmission radio data transmission is not required to set up cables or digging cable trench, you only need to connect the wireless data transmission radio and set up the appropriate height of the antenna in each terminal can be. Compared with the wireless data transmission module to establish a dedicated wireless data transmission mode, saving manpower and material resources, the investment is quite economical.
Of course, in some close-range data communication system, wireless communication is not lower than the wired way cost, but sometimes the actual site environment is difficult to wire, the customer according to the needs of the site environment or will choose the wireless way to realize the communication.
2, the construction project cycle is short
When to be several kilometers to dozens of kilometers away from each other to connect the remote site communication, using the wired way, you must set up long-distance cables or dig a long cable trench, the engineering cycle may require several months of time, and the number of transmission module to establish a dedicated wireless data transmission, only need to set up the appropriate height of the antenna, the engineering cycle requires only a few days or a few weeks can be, the wireless way can be quickly and quickly. In contrast, the wireless way can quickly set up a communication link, the project cycle is greatly reduced.
3, good adaptability
The limitations of wired communication is too large, in some special applications, such as mountainous, forested areas, lakes and other special geographic environments or moving objects and other wiring is more difficult to apply the environment, the wired network will have a strong constraints on wired engineering, and the establishment of a dedicated wireless data transmission module with the wireless data transmission module will not be subject to these limitations, so that with the wireless data transmission module to establish a dedicated wireless data transmission method will have a better adaptability than wired communication. So the wireless data transmission module to establish a dedicated wireless data transmission mode will not be subject to these restrictions, so the data transmission mode will have a better and wider adaptability than wired communication, almost not subject to geographic limitations.
4, good scalability
In the user set up a good communication network, often because of the system needs to add new equipment. If the wired way, the need to re-wire, construction is more troublesome, and there is the possibility of destroying the original communication lines, but if the use of wireless data transmission radio to establish a dedicated wireless data transmission mode, just add new equipment and wireless data transmission radio connected to the expansion of the system can be achieved, compared to a better scalability.
Third, the wireless communication module function
In the era of the Internet of things, if you want to communicate between things, you need to rely on the wireless communication module to help them realize the signal sending and receiving, so that all kinds of Internet of things terminal equipment with networking message transmission capabilities.
1, communication function: support GPRS and SMS dual-channel data transmission; support multi-center data communication.
2, the use of function: the collection of serial device data, such as serial meters, collectors, PLC, etc..
3、Remote management function: support remote parameter setting and program upgrading.
Fourth, the characteristics of wireless communication module
In the era of the Internet of things, if you want to communicate between things, you need to rely on the wireless communication module to help them realize the signal sending and receiving, so that all kinds of Internet of things terminal equipment have the ability to network message transmission. In the Internet of Things perception layer terminal equipment data are required through the wireless communication module will be converged to the network layer, so that through the management platform for remote monitoring and management of network equipment, improve management efficiency.
1, with anti-jamming ability: anti-jamming ability, can meet the different wireless communication environment, especially under the interference environment;.
2、Have high bandwidth: realize access high bandwidth and transmission high bandwidth, support the transmission rate demand of various services;.
3, wide coverage: through a wide range of wireless access and distributed multi-hop transmission to achieve wide coverage of the network.
4、Strong mobility: strong mobility to meet the needs of mobile deployment.
5、Auto-repair: Enhance the anti-destruction and self-repair ability of the network.
6, fast deployment: to achieve node plug and play, network deployment without human intervention.
7, transmission security: through the customized encryption and decryption algorithms and authentication authentication mechanism to ensure the security of transmission.
V. Working principle of wireless communication module
Most of the modules involved in the Internet of Things are wireless communication modules, referred to as wireless modules. The principle of wireless communication module is to send or receive electromagnetic signals and convert them into messages that we can understand. The role of the wireless communication module is to connect things to things, so that all kinds of Internet of Things terminal equipment to realize the message transmission ability, but also let all kinds of smart devices have an Internet of Things message interface.
The principle of wireless communication is to transmit sound, text, data, images and other messages through electromagnetic waves (without cables) in free space. The three main types of message transmission are ground wave propagation, sky wave propagation and linear propagation.
As the IOT communication system works in VHF and UHF frequency bands (30—3000MHz), electromagnetic waves propagate in the lower atmosphere in a direct way. As the lower atmosphere and under the uniform medium, will produce refraction and absorption phenomena, and in the transmission path encountered a variety of obstacles may also produce reflection (R), diffraction (D), bypassing and scattering (S) and so on.
1, when the electromagnetic wave encounters a much larger than the wavelength of the object, it will be reflected, reflection occurs on the surface of the earth, buildings and wall surfaces and other smooth interfaces.
2, When the propagation path between the receiver and transmitter is blocked by sharp edges, electromagnetic waves are bypassed. As a result of the bypassing, the electromagnetic wave can cross the obstacle to reach the receiving antenna. Even if there is no line-of-sight path between the transceiver antenna, the receiving antenna can still receive the electromagnetic signal.
3, when the wave traveling through the medium there is less than the wavelength of the object and unit volume of the number of blocking body is very large, scattering will occur. Scattered waves arise from rough surfaces, small objects, or other irregularities. In practical communication systems, scattering is induced by leaves, street signs, and lampposts.
Since electromagnetic waves are continuous analog signals, digital data in wireless communications needs to be modulated into analog signals, commonly by ASK (amplitude shift keying), femto-speed (FS) K (frequency shift keying), and PSK (phase shift keying).
Note: In a communication system there are two types of signals, analog and digital; an analog signal is a continuously varying electromagnetic wave, while a digital signal is a sequence of voltage pulses. Telephone communication belongs to the analog data (sound waves) through the analog signal transmission; home broadband dial-up Internet belongs to the digital data through the analog signal (by & ldquo; cat & rdquo; complete modulation) transmission, at the same time the analog signal can be converted into a digital signal (by & ldquo; cat & rdquo; complete demodulation); computer local area sharing belongs to the digital data through the digital signal transmission.
Six, the types of wireless communication module
There are so many types of wireless communication modules on the market, how do we distinguish between them? Based on different application scenarios and user needs developed different wireless communication technologies, the following Junoda technology editor for you to analyze in detail.
1, Bluetooth
Bluetooth is our daily contact more a wireless communication module, this technology in 1994 by the then telecommunications giant Ericsson invention, it is a wireless technology standard, can realize the fixed terminal equipment, mobile terminal equipment and personal domain network between the short-distance data exchange, the use of 2.4 ~ 2.485GHZ I-band UHF radio waves.
Bluetooth wireless technology is more complex; equipment networking speed, 10 seconds; integration and reliability is very high; transmission rate is generally 1Mbps; low cost, installation is relatively simple, is a suitable for short-distance wireless communication technology.
2, Wi-Fi
Wi-Fi wireless technology we are very attribute, is our daily contact with the most of a wireless communication technology. It is created with IEEE 802.11 standard wireless LAN technology. This technology is all wired network signals into radio wave signals, other terminal equipment through the wireless communication module connected to the wifi, realize the wireless network communication.
Wi-Fi technology coverage is generally within 100 meters, the technology is more complex, the transmission rate of up to 54Mbps, the working frequency band is 2.4GHZ, the transmitter power is lower than 100mw, compared with the Bluetooth wireless communication, data security performance is poor. But the invention of wifi is very much in line with the modernization of personal and social needs, the development prospects are very great.
3、Traditional digital transmission radio
Digital transmission radio is a high-performance professional data transmission radio realized with the help of DSP digital signal processing technology and software wireless point technology. Digital transmission radio can be understood as a communication medium, with fiber optics, microwave, there is a certain range of use. Digital transmission radio transmission distance is very far, applicable to a variety of complex environments, the transmission rate of 19.2Kbps, but the terminal equipment is more expensive, the use of cost is also high, the installation is more complex.
Seven, the application of wireless communication module
Wireless modules are widely used in vehicle monitoring, remote control, telemetry, small wireless networks, wireless meter reading, access control systems, cell paging, industrial data acquisition systems, wireless labels, identification, non-contact RF smart cards, small wireless data terminals, security and fire prevention systems, wireless remote control systems, biological signal acquisition, hydrological and meteorological monitoring, robotics control, wireless 232 data communications, wireless 485/422 data communications, digital audio, digital audio and video. 422 data communication, digital audio, digital image transmission and other fields.
Ultra-aberrant receiver module technical indicators Ultra-aberrant receiver module volume: 28x11x4.5 mm Main technical indicators: 1, communication mode: AM2, operating frequency: 315MHZ3, receiving sensitivity: -102DBM4, quiescent current: 0.1MA5, operating current: 2.5MA6, operating voltage: DC 2.1-5.5V7, output mode: TTL Level.
Eight, the use of wireless communication module precautions
Wireless communication module, sound meter stabilized frequency, stable function, suitable for battery-powered small size, low voltage, micro-power module. The use of wireless communication module is very simple, only need to pay attention to the following three precautions can be:
1, a reasonable communication rate
Data module of the maximum transmission data rate of 9.6KBs, generally controlled in 2.5k or so, too high a data rate will reduce the sensitivity of the reception and increase the BER or even not work at all.
2, a reasonable message code format
Microcontroller and module work, usually their own definition of the transmission protocol, regardless of the modulation method, the message code format to be transmitted is very important, it will directly affect the reliable receipt and transmission of data.
Recommended Programs for Code Set Format
Leading code + synchronization code + data frame, leading code length should be greater than is 10ms, in order to avoid background noise, because the first bit of data received by the receiver module is very easy to interfere (i.e., zero-level interference) and cause the received data error. So using the CPU compilation code can be added in front of the data identification bit some garbled code to suppress zero-level interference. Synchronization code is mainly used to distinguish the leading code and data. There are certain characteristics, so that the software can identify the synchronization code through certain algorithms, and at the same time be prepared to receive data.
Data frame should not be used non-zero code, not to mention long 0 and long 1. Manchester code or POCSAG code, etc..
3, microcontroller interference with the receiver module
Microcontroller simulation 2262 is generally very normal, however, microcontroller simulation 2272 decoding will usually find that the remote control distance is shortened a lot, this is because the multiplication of the clock frequency of the microcontroller will be on the receiving module to produce interference, 51 series of microcontrollers electromagnetic interference is relatively large, the 2051 is slightly smaller, the PIC series is relatively small, we need to use a number of anti-jamming measures to reduce the interference. For example, the microcontroller and the remote control receiver circuit are powered by two 5-volt power supply, the receiver board will be a separate 78L05 power supply, the clock area of the microcontroller away from the receiver module, reduce the operating frequency of the microcontroller, the middle to join the shielding and so on.
Receiving module and 51 series microcontroller interface is best to do an isolation circuit, can better contain the microcontroller on the receiving module of electromagnetic interference. Receiving module work is generally output high level pulse, not DC level, so you can not use a multimeter test, debugging can be a light-emitting diode in series with a 3K resistor to monitor the output state of the module.
Nine, wireless communication module development prospects
Being in the information age, you can find that communication technology is particularly important, it has a huge impact on people's work and life and other aspects, while more and more areas can not be separated from the support of communication technology, especially in the field of Internet of Things. Communication technology is divided into wired communication technology and wireless communication technology, in which wireless communication technology can make the message transmission and exchange between people more convenient. China's wireless communication technology is developing at a rapid pace (FS), in the country and the support of science and technology, phase communication in the future will also maintain a very good development trend, promote the application of all fields, become the future of people's work and life is inseparable from the part that can break the barriers of time and space, to achieve the high-speed and efficient exchange of information within the global context, so that the communication technology to play a greater role.
Ltd. specializes in high-precision GNSS modules and wireless communication products, technology development and application promotion service providers, relying on the wireless communication technology in the field of R & D and promotion of experience, JUNODA set up a team with a wealth of experience in hardware and software development technology, aimed at domestic and foreign OEM / ODM customers and system integrators to provide high-quality, high-performance wireless modules and application solutions, and is committed to creating long-term customer satisfaction. We aim to provide high-quality, high-performance wireless modules and application programs to OEM/ODM customers and system integrators at home and abroad, and create long-term value for customers!
The company mainly provides integrated antenna module, dual-frequency high-precision module, single-frequency high-precision module, thousand-seeking high-precision module, Zhongke micro-positioning module, U-BLOX positioning module, SICOM communication module, inertial navigation DR module, UWM GNSS module, RTK differential module, 4G communication module and high-precision antenna, etc., the products are sold well in Beijing, Shanghai, Shenzhen, Guangdong, Jiangsu, Zhejiang, Sichuan, Hunan and other parts of the country. Our GNSS modules are widely used in many application fields, such as drones, vehicle security monitoring and scheduling, automatic bus stop announcement, DVR, car DVD navigation, GPS electronic dog, synchronized timing, high-altitude balloon monitoring, engineering machinery, industrial automation, etc. In the field of wireless communication products, our company is closely involved in the development and production of wireless communication products, such as RTK differential modules, 4G communication modules and high-precision antennas.
In the field of wireless communication products, the company follows the latest development of international communication technology, introduces and acts as an agent for wireless communication modules that meet the market demand, and the products have a comprehensive layout from 2G, 3G, 4G, and are widely used in financial electronic payment, vehicle remote control, remote advertising information, repeater monitoring, mobile Internet terminals, smart home, remote medical care, network testing, enterprise information management, anti-theft alarm, Remote video transmission, intelligent meter reading, mobile computing, network navigation, voice phone, wireless gateway and other fields. Focus areas include video surveillance, network optimization, routers, POS and other M2M industry applications.
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