Research And Development Of Embedded Monitoring System Based On LoRa

With the development of monitoring,the transmission of data has been changing from wired to wireless,from non-online to online.The development of wireless communication technology has brought great convenience in the filed of data transmission.At the same time,the wireless communication technology is effected on solving the problems of difficulties in construction,and high costs due to wired transmission caused by the environment,geographical,and other factors And in some engineering fields,such as the monitoring of atmospheric environment,not only environmental parameters such as temperature and humidity,CO2,and light intensity are to be collected,but also,in accordance with the collected data,and make a corresponding warning according to the parameters which has been collected.The processors of traditional 8/16-bit are no longer capable of this complex operation.In addition,there are many observation points in the monitoring of atmospheric environment,and the distances between monitoring units are far apart.The technologies such as zigbee and wifi cannot meet the monitoring requirements because of the limited communication distance.Beside,with the development of network communication technologies,we all put forward higher expectations in monitoring and monitoring field.We want to be able to achieve the collection of data,and want to be able to observe and collect the data anytime,anywhere.So putting the monitoring information to Ethernet is becoming increasingly important.These problems in atmospheric environment monitoring also exist in the monitoring of greenhouse,slope tunnels,and road conditions.In order to solving these problems,The research of the dissertation is based on the monitoring of the atmospheric environment and developing an embedded monitoring system based on LoRa.The core to perform complex operations is high-performance embedded microprocessor STM32;The latest ultra-long-distance low-power wireless transmission technology,LoRa,which would solve the problem of short communication distance for the communication mechanism;The GPRS network communication technology will remote transmission;Taking into considerof difficult programming and poor scalability of front and back programming that want to show the system based on the ?C / OS-II operating system The system has the advantages of long transmission distance,flexible networking and simple structure.The entire research process include the following three steps:First of all,understandind the development status of wireless communication technology and apply the application of LoRa to the monitoring field by consulting relevant literature of wireless communication.Combined with the application background of atmospheric environment monitoring,the entire system including the data acquisition unit,data processing unit and data transmission unit will be analyzed in detail.According to the objectives which will be achieved in the research project,the overall design of the project will be proposed.Second,The hardware circuit of acquisition node and the aggregation node will be designed that based on sensors,controllers,wireless communication modules and other components.Then the relevant software development was performed on the ?C/OS-II operating system.Finally,the MCU of acquisition node would control the sensor to collected PM2.5 and temperature and humidity data,and then the data would be transmitted to the convergence node through the SX1278 RF module,and the convergence node was transmitted to the remote though the GPRS network.The computer would perform the system.Finally,the embedded system based on LoRa will be tested which has been developed.At the same time,the problems and key points were analyzed of the whole system.The prospects of the paper were designed.In short,the development of LoRa-based embedded monitoring solves the problems in the current monitoring field,and provides a new direction for the further researching and development of the system.