| Smart agriculture is an agricultural information ecosystem that integrates technologies such as the Internet,mobile Internet,and cloud computing,and highly shared and dynamic information.Temperature and humidity play a pivotal role in human life.The two physical parameters that interact with humans the most in nature.In various scenes of life,the collection or control of temperature and humidity is very frequent and important.With the development of the current era,science and technology Networking and remoteization are the development trend of the advancement of the Internet,avoid wiring.An inevitable trend in the development of modern technology for temperature and humidity collection systems is networking and remoteization,which mainly solves the problem of difficulty in laying cables for wired temperature and humidity collection systems.With the popularization of domestic 4G networks and the realization of 5G networks,long-distance wireless transmission technology has become more and more developed.In recent years,a long-distance,low-cost,low-power consumption,high cost performance,strong transmission reliability,and high stability,called Long Range(LoRa),two-way wireless communication technology has emerged.Taking the advantages of LoRa technology as the starting point,we have a comprehensive understanding of the current mainstream wireless temperature and humidity acquisition system requirements at home and abroad,and through the comparison of various wireless transmission technology solutions,a set of long-distance low-power wide-area network communication based on LoRa is designed and implemented Technical wireless temperature and humidity acquisition system.The article focuses on the working principle and operation mode of LoRa technology,explains why LoRa wireless communication technology is selected,and introduces the working mode of LoRa in detail.In terms of system hardware design,it is mainly divided into gateway summary node,terminal acquisition node and LoRa wireless transmission module.STC89C51single-chip microcomputer is used as the system processor.The main goal of system design is to ensure that the system normally completes data collection and transmission functions.Minimize the actual operating power of the system,use LoRa wireless communication technology as the main technical support,and adopt the system architecture of gateway + terminal,which can maximize the real-time monitoring of the temperature and humidity information collection of different terminals at the remote end.In the software design part of the system,the operation mode of each module and the program design realization mode are introduced in detail.The feasibility analysis of the system design and the flow design diagram of the corresponding modules and the system are carried out.Each module is connected with the microprocessor to make the temperature and humidity acquisition system run efficiently and quickly.Finally,collect and summarize the data of this design,and apply it to various indoor and outdoor occasions,which proves the feasibility of the system.The system has improved signal reception strength,communication success rate,data packet loss rate,and power consumption..In an unobstructed open area with a communication distance of 3km,the communication success rate is increased to 97%,and the communication success rate is increased to 95% when there is a building block;when there are a large number of obstructions within 3km,the maximum communication data packet loss rate is multiple points 4% during communication;there is also a certain increase in power consumption,with the maximum power consumption of 429 m W in transmit mode.This system has been greatly improved in terms of user operation,system cost,signal receiving sensitivity,etc.It is suitable for small and medium-sized agricultural users in most areas of my country,and solves the problems of large-scale agricultural planting collection difficulties and manual measurement errors. |
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