Research And Application Of Wireless Monitoring System For Solid Fermentation Pit Based On Internet Of Things Architecture

Liquor is not only the carrier of our national cultural inheritance,but also an important economic pillar industry in our country.Understanding the changes in the internal environment of the pit during liquor fermentation is of great significance for controlling liquor fermentation and improving liquor quality.However,due to the internal sealing of the pit and the dynamic fermentation process,it is difficult and cumbersome to monitor the internal environment of the pit.At present,there are manual sampling methods to analyze the internal environment of the pit,but these methods have problems such as single monitoring parameters,high labor cost and pit damage.Aiming at these problems,our subject designs a wireless monitoring system for the pit environment based on the Internet of Things architecture.In the subject,the wireless monitoring system for the pit environment in accordance with the Internet of Things architecture which contained support layer,sensing layer,transport layer and display layer.The supporting layer mainly covered the minimum system,power management module and external structure of the instrument.The smallest system used CC2530 as the main control chip combined with the OSAL polling mechanism to realize task scheduling and management of the entire monitoring system.Power management module based on TPS5430,TP7660 and LM317 LZ chips design a variety of voltage conditioning circuit.After on-site inspection of the factory and the pit environment,an external structure adapted to the pit collection instrument was designed.The sensing layer was designed with a signal acquisition module and a signal processing module.We designed corresponding acquisition circuits for different environmental sensors in the signal acquisition module,so that the signals transmitted by the environmental sensors could be better recognized by the main control chip.The signal processing module established a temperature fitting model and a moisture prediction model by introducing the median filter algorithm,the least square method and the improved Kalman algorithm to improve the accuracy of the data collected by the sensing layer.In order to improve the reliability of data transmission,the transport layer designs a hybrid transmission mode.The wireless transmission was implemented by CC2530 integrated radio frequency module and equipped with ZigBee protocol,the wired transmission was implemented by RS485 bus and equipped with MODBUS protocol.The display layer contained a button circuit and a display module.The button circuit combined the idea of the matrix button to realize the identification of single I/O port button operation,and then used the interactive code to achieve the human-computer interaction.The display module included acquisition instrument,host computer and mobile terminal interface,and the data was displayed on the acquisition terminal,computer terminal and mobile terminal in a visual manner.At the end of the thesis,the wireless monitoring system was tested in the laboratory environment,and then the wireless monitoring system was applied to the winery cellar workshop for field testing.According to the laboratory test results and the field application results of the winery,the accuracy of the wireless monitoring system satisfied the requirement of subject and could realize the function of remote real-time monitoring of changes in the internal environment of the pit.