Design and implementation of the turbidity remote monitoring system based on stm32f407 microcontroller

Abstract

Facing the developing trend of remote monitoring and real-time early warning of the monitoring system, based on FX -11A optical fiber sensor and the STM32F407 microcontroller, a turbidity remote monitoring system design is completed to monitor turbidity with high precision. According to Lambert-Beer Law and theoretical derivation, the relationship between the reference voltage and the measured voltage under the measuring facility was obtained. Based on this, two sets of experiments were designed by using a mixture of water and soil and 0-4000NTU Formazin solution to achieve the purpose of high-precision measurement of turbidity. Processing the experimental data with MATLAB software, the results shows that the system can monitor the turbidity, the correlation coefficient is as high as 0.9955, and the turbidity range of 400-1500 NTU can be monitored with an error of 3.5%. Take the STM32F407 microcontroller as the core controller in the system, and it is connected to Internet to realize the function of web server with Light Weight IP (LWIP) communication protocol. The value of turbidity can be transmitted to web server in real time with Server Side Include (SSI) instruction, and any device connected to Wi-Fi can realize the remote monitoring function through the router. The system function can realize the remote monitoring and real-time warning function of turbidity, which is in line with the developing trend of the monitoring system.