Because there is no cable, electromagnetic signals are freely spread in space, so it is possible to transmit information such as sound, text, data and images remotely.
But after all, we do not have any special functions, we can not transmit electromagnetic waves directly to the human body, nor can we understand the information in the electromagnetic signal. At this point, it is necessary to send and iot wifi module receive electromagnetic signals with a cell phone and convert them into information that can be directly understood.
Because of the cell phone, the user does not need to know how to send and receive electromagnetic waves. The user can communicate remotely by simply talking to the phone.
Radio module communication principle.
How should people and things communicate with each other in the network era?
At this time, the wireless communication module, a device similar to a "cell phone", becomes convenient. In short, a wireless module is a collection of chips and their required peripheral circuits.
The radio communication module is the information portal that allows various physical network terminal devices to send network information and allows various smart terminals to access the physical network.
It is an important connection between the network-aware layer and the network layer. Through the network-aware layer, the device data generated by the terminal is aggregated to the network layer through the radio communication module and managed remotely through the cloud management awareness platform, while data analysis is performed.
It is an important link in the IoT industry chain.
The IoT industry chain is very long, and the module is upstream of the chip and downstream of the terminal application. What is the value of that module?
Similar to cell phone, manufacturers in the upstream and downstream of the industry chain need to assemble the chip and other components, make a complete cell phone by adding screen and shell, and finally insert the SIM card to make calls.
Similarly, if a device "calls" another device and wants to service that component directly (for example, by embedding a baseband chip into the device).
In this case, the module manufacturer would need to integrate various components such as the baseband chip, RF, memory chip, capacitors and resistors to assemble the "cell phone" into the device. When you insert the device into the card, you can use it to make calls directly.
So, this is an important part of the IoT chain of modules. Hardware integration and software design using multiple communication methods can meet the environmental needs of different application scenarios, simplifying the work of application manufacturers.
Able to meet a variety of different communication needs.
The specific requirements for communication between objects vary. Just as people have different skin tones, come from different regions and speak different languages.
With water meters, there is little need to send data, or to send data every day.
With vehicles, a large amount of data is transmitted, so real-time data is needed.
Other devices, such as factory motors, roadside street lights, and home speakers, have other needs as well.
So, who will meet these fragmented needs?
The answer is: wireless modules. In addition, the value of wireless modules in the IoT industry chain comes to the fore. Upstream of wireless communication modules is the production of raw materials, such as highly standardized baseband chips. The next level is the application area of each segment and is very decentralized. iioT module itself is located in the middle of the upstream standardized chip and the downstream distributed vertical, which must meet the specific needs of different customers and different application scenarios.
Scenarios where various wireless modules are applicable.
2G modules are widely used in early bike-sharing (of course, experimentation with LPWAN technology is starting) and other low data demand modes.
3G modules are suitable for mobile payment field requiring large amount of data.
4G modules are suitable for high-speed automotive and video surveillance areas.
LPWAN modules were first commercialized for low-power and demanding forgeries.
According to the communication technology, wireless communication modules can be generally divided into the following categories.
2G modules are modules that can access the operator's 2G network, and NB-IoT modules are modules that can access the NB-IoT network.
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