Working principle of Bluetooth module

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1. Working principle of Bluetooth module

　　Bluetooth devices use radio waves to connect to phones and computers. Bluetooth products contain a small Bluetooth module as well as the Bluetooth radio and software that supports the connection. When two Bluetooth devices want to communicate with each other, they need to be paired. Communication between Bluetooth devices takes place in a temporary network of short range (called a piconet, which refers to a network formed by devices connected using Bluetooth technology). This network can accommodate two to eight devices to connect. When the network environment is successfully established, one device acts as the master device and all other devices act as slave devices. Yingtang Zhongchuang is dynamically and automatically established when Bluetooth devices join and leave the radio short-range sensing.

2. Transmission method of Bluetooth module

　　With the continuous development of Bluetooth technology in recent years, the transmission rate of Bluetooth has been continuously improved while the power consumption has been continuously reduced, making the application scope of Bluetooth more extensive. However, if you want to design a complete Bluetooth system, you must fully master the relevant technical knowledge of Bluetooth, such as: RF design, protocol stack, system integration and Bluetooth module selection and other specialized knowledge.

The Bluetooth module can transmit data through the serial port ( SPI , IIC ) and the MCU control device. The Bluetooth module can be used as a host or a slave. The host can search for other Bluetooth modules and actively establish a connection, while the slave cannot actively establish a connection and can only wait for others to connect to it.

3. Factors affecting Bluetooth module

　　In recent years, as wireless communication technology has entered people's lives and consumer electronic products have become increasingly popular, various wireless communication technologies have played an increasingly important role, and the market for wireless products has been further improved. Antennas, as an indispensable key component in wireless products, have also been further improved. In Bluetooth products, the relationship between antennas and Bluetooth modules is complementary. In addition to the system chip as the core, the antenna is another key component that affects the transmission characteristics of the Bluetooth module.

4. How to choose Bluetooth module according to needs

　　At present, Bluetooth technology has penetrated into various fields, and its product applications include almost any conceivable devices such as smart door locks, bracelets, tire pressure, electronic cigarettes, industrial automation control, etc. However, for customers, the best product is the one that suits them, and it is wise to choose according to their needs.

First, the Bluetooth module is responsible for converting the data received from the serial port into the Bluetooth protocol and sending it to the other party's Bluetooth device, and converting the Bluetooth data packet received from the other party's Bluetooth device into serial port data and sending it to the device.

Secondly, choose Bluetooth modules with different functions according to the transmission characteristics. If it is used to transmit data, you can choose point-to-point transparent transmission modules, point-to-multipoint modules, etc.

Secondly, choose according to the packaging form. There are three types of Bluetooth modules: direct plug-in type, surface mount type and serial port adapter. The direct plug-in type has pins, which is convenient for early welding and small batch production. The module has two installation methods: internal and external. In addition, there is an external serial port Bluetooth adapter. When it is inconvenient for customers to build Bluetooth into the device, they can directly plug the adapter into the serial port of the device and use it after powering on.

5. Application value of Bluetooth module

　　The low power consumption of Bluetooth has enabled it to demonstrate its unique value in many new fields, from consumer electronics to medical electronics, from smart homes to industrial applications, and Bluetooth low power consumption is playing an important role in the IoT market. This feature is also the best choice for sensors, and the IoT and cloud connections naturally emerged, enabling Bluetooth devices to connect to anything and connect to the network (read or download information from the cloud).

In 2010 , Bluetooth 4.0 was released, and Bluetooth's low-power technology instantly became an obvious advantage. In 2016 , Bluetooth 5 was released. Compared with the previous version, not only the transmission distance increased by more than 4 times, but the transmission speed also doubled, which means that the transmission time between devices can be saved by half (including uploading and downloading), which is what we often say is to get twice the result with half the effort.