Most of the current shared massage chairs use 4G module to communicate with the server. However, the current market of 4G module is still expensive, if each massage chair has a 4G module, the overall cost of massage chair will be relatively high. In order to solve this problem, we propose a new solution of 4G + Bluetooth mesh networking communication. First, we make up a Bluetooth mesh network through Bluetooth, and use a 4G module in one or two massage chairs. Then all massage chairs are connected to the server through the massage chair where the 4G module is located.
Specific connection mode: two boards (a small board and a large board, see the figure below), the small board only contains the "Bluetooth mesh" part, the board contains the "4G + Bluetooth mesh module" part. The small board is equivalent to the node in the subnet, and the big board is equivalent to the gateway in the subnet. The board transmits data to the board through Bluetooth mesh network. After collecting data from all nodes, the board uploads the data to the server, and the downlink data communication mode is similar.
Content
In the era of shared economy, with the continuous development of economy and the acceleration of people's life rhythm, people pay more and more attention to physical and mental health. Shared massage chairs are more and more popular. App control, intelligent voice, VR technology bring more intelligent and humane experience to people. At the same time, new technologies such as NB-IOT, LORA and other Internet of Things are constantly emerging. In order to meet the requirements of the era of "interconnection of all things", our company specially introduces the communication solution of "4G + Bluetooth mesh networking" massage chair.
I. Brief Introduction of the Scheme
There are many solutions to the existing market of shared massage chairs. Why does our company choose 4G + Bluetooth mesh communication solution?
The trend of 1.2G withdrawal is irreversible, and its network coverage is getting lower and lower. As a result, more and more users of shared massage chairs have encountered the situation of massage chair dropping off. 3G also faces the risk of poor coverage, while 4G currently has high coverage in the whole country, and the stability of communication is relatively guaranteed.
2. NB-Iot Solution: Without large-scale market validation, there are many potential unpredictable worries. At the same time, it also faces the problem of low network coverage and will soon be replaced by 5G communication system.
3. Lora Solution: It belongs to private protocol, and has poor security and anti-interference. From the actual situation of Lora communication in part-shared massage chair, there is a big gap in stability compared with Bluetooth and 4G.
II. Programme Advantages
1. Low price.
Although the speed of 4G communication is fast, the price of 4G module on the market is generally relatively high. If each shared massage chair uses 4G module, it will undoubtedly increase the cost greatly. However, for some low-speed networking systems, such as sharing massage chairs, it does not need too high speed, but only a data node connected to the server. Therefore, for low-rate networking systems, "4G + Bluetooth mesh networking" scheme will undoubtedly save costs.
2. Multi-node connection, stable data transmission, strong anti-jamming ability: a 4G module can allow up to 100 massage chairs in the same area to communicate with the server at the same time. Under the same circumstances, if LORA solution is adopted, it is easy to cause some massage chairs to drop off. Our company adopts the communication scheme of 4G + Bluetooth mesh massage chair, using the frequency hopping technology of Bluetooth protocol, effectively preventing interference caused by simultaneous communication of multiple massage chairs, and Bluetooth technology provides higher security to prevent payment data from being stolen. Bluetooth technology is widely used in personal consumer electronic products such as mobile phones. It also provides possible extensibility for sharing massage chairs using 4G + Bluetooth mesh communication scheme to provide Bluetooth music, voice recognition, health detection and other user scenarios in the future.
3. Wide Voltage Range Advantage: Wide Voltage Range Input is one of the significant advantages of the solution, providing the best voltage compatibility for different types of massage chairs, making the use and communication of massage chairs safer and more stable. The scheme also has the advantages of low power consumption, flexible customization, abundant interfaces, smaller size, lower cost, additional antenna and later technical support.
Ⅲ.WLT82666BM Specification
The communication solution of 4G+Bluetooth mesh massage chair realizes the data transmission between massage chairs in the same area through Bluetooth mesh. The Bluetooth module WLT8266BM plays an important role. The WLT8266BM module used in the function of Bluetooth mesh in small and large boards is one of the low-power and low-cost Bluetooth data modules of our company. Its specifications and pin diagrams are as follows:
Specification:
1. Built-in high performance 32-bit MCU, 128KB Flash, 16KB SRAM
2. Compliance with Bluetooth 4.2 standard, RF link data up to 2Mbps
3. The number of GPIOs available is as high as 22
4. The working clock of the system is 48MHz
5. DeepSleep Current 0.7uA
6. Support hardware AES encryption
7. Support OTA air upgrade
8. Wider operating temperature - 40°C-85°C
9. The module has been certified by BQB/FCC/CE/SRRC
