Application of Lora technology in long distance wireless transmission of water meter reading

LoRa yes LPWAN One of the communication technologies , Is the U.S. Semtech The company adopts and promotes an ultra long distance wireless transmission scheme based on spread spectrum technology . This scheme changes the previous compromise between transmission distance and power consumption , Provide users with a simple way to realize long-distance communication 、 Long battery life 、 Large capacity systems , And then expand the sensor network . at present ,LoRa Mainly in the world's free band , Include 433、470、868、915MHz etc. .

The above three pictures are from Chengdu yibaite Electronic Technology Co., Ltd LoRa modular .LoRa Module is an ultra long distance wireless transmission scheme based on spread spectrum technology . This scheme changes the previous compromise between transmission distance and power consumption , Provide users with a simple way to realize long-distance communication 、 Long battery life 、 Large capacity systems , And then expand the sensor network .LoRa Technology has a long distance 、 low power consumption 、 multi-node 、 Low cost features are based on LoRaWAN The network can provide secure two-way communication with long data transmission distance , And cover urban areas with minimal network infrastructure ,LoRa Technology in smart agriculture 、 Intelligent building 、 Smart logistics and other application scenarios will be widely used .

This paper designs a design based on LoRa Wireless water meter reading system for communication , It has high accuracy , Wide adaptability and practicality . The wireless water meter reading system designed in this paper is based on the different functions of each device , It can be divided into water meters 、 Repeater and concentrator , The main function of the water meter is the forward flow statistics 、 Reverse flow statistics 、 Magnetic interference detection 、 Emergency valve closing and wireless data transmission ; The main function of the repeater is to transmit and receive signals to the remote water meter ; The main function of the concentrator is to receive workstation instructions , Manage the water meter 、 Data collection and uploading .

Chengdu yibaite's... Is adopted in the design LoRa  modular , Its embedded High-Speed Low-Power MCU and high-performance LoRa Spread spectrum chip SX1278 SX1276,SX1278 SX1276 Chip LoRa Communication technology can solve the problems in modern buildings , The signal of ordinary wireless communication technology can not penetrate the floor to read the water meter in the high-rise building , also SX1278 SX1276 With low power consumption mode and sleep wake-up technology , Combine the design of hardware and software , So that the water meter and repeater powered by battery can maintain ultra-low power consumption , The problem of short standby time in wireless meter reading is solved . The communication protocol in the design is improved on the basis of wired meter reading protocol and the functional requirements of wireless meter reading .

Water meter 、 Between repeater and concentrator LoRa signal communication , It is mainly used for reading data in water meter by concentrator . The concentrator receives workstation instructions and uploads data , It's using GPRS signal communication . When the workstation needs meter reading , adopt GPRS Send meter reading instruction , After the concentrator receives the command, it passes LoRa Communication sending meter reading instruction to water meter , After receiving the instruction, the water meter returns the data to the concentrator , The concentrator returns the received data to the workstation , So as to realize the process of wireless meter reading .

  Compared with traditional water meters , use LoRa The intelligent water meter of technology can be accurate 、 Quickly collect and record real-time water use data of residents , Improved work efficiency , Guarantee the quality of service . During peak water use , The user water use information system can comprehensively monitor the regional water use 、 Balanced scheduling , And then effectively guarantee the production of enterprises and domestic water .