Design Of Laser Water Level Measurement System Based On Internet Of Things Technology

Water conservancy facilities are an important part of the stable development of my country's society.Domestic water,industrial water,hydropower,agricultural irrigation and other industries need a stable water conservancy system.However,due to the complex geographical environment and uneven distribution of water resources in my country,there are still no corresponding water level monitoring devices in some water resource areas located in remote areas with complex terrain,and the frequent occurrence of flood disasters in recent years,it is very necessary to predict the changing law of water level.Today,the mature development of the Internet of Things and laser technology makes the design of the water level measurement system more suitable for real-time and accuracy requirements under the background of the times.Using the laser sensor as the sensing layer device of the system can not only achieve millimeter-level measurement accuracy,but also has the characteristics of low power consumption,small size and strong anti-interference ability,which is suitable for use in complex environments.Using wireless communication technology,the sensor data of multiple nodes can be quickly and stably transmitted to the server,so as to achieve the purpose of real-time monitoring and prediction.Based on the application of Internet of Things technology and laser ranging,this paper designs a water level measurement system,which includes six parts: laser ranging,wireless communication,microcontroller unit,power management,host computer and photovoltaic power supply.The design of the lower computer selects STM32F103 as the MCU of the system,and the MCU drives the laser sensor to realize the collection of water level data.The MCU encapsulates the collected data into frames and sends it to the 4G chip.After the 4G chip successfully receives the data,it sends the data to the cloud server through the Modbus RTU communication protocol.In order to display the change of water level more intuitively,Visual Studio is used to design the window program of the host computer,and the data of the cloud server is pulled to the subscribers through the TCP protocol.Due to the complexity and variability of the laying site of the water level measuring device,a solar power supply method is designed,and an improved disturbance observation algorithm is used to realize the maximum power point tracking(MPPT)of the solar cell,thereby improving the charging efficiency of the battery and saving the solar panel area,reducing the floor space.In order to reduce the influence of water flow fluctuation on the measurement accuracy,a water flow buffer device is designed to make the laser reflect smoothly on the floating plate and reduce data fluctuation.After the system design was completed,the measurement accuracy,communication stability and photovoltaic charging performance of the system were tested experimentally in Tai'an Reservoir in Tonghua County and a tributary of Hunjiang River in Jinchang Town.The test results verify the feasibility and reliability of the system.Finally,the design of the system is summarized and analyzed through the experimental data results.