Research And Implementation Of Light Regulation With Growth Tracking Technology Based On PLC And Kingview

Light is the most important environmental factor in plant factory research.Plants need different light environment in different growth stages.At present,the development trend of plant lighting is to use new LED light source to become the main artificial light source for plant culture.The system designed in this paper is to comprehensively control the three elements of light environment.In different growth stages of plants,the optimal light environment designed by us is used to automatically track the growth.At the same time,according to the process of gradual change of light intensity at sunrise and sunset in the natural growth environment of plants,the light intensity of LED lights gradually becomes stronger at the start-up stage and weakens before cutting off,so as to achieve To use artificial light to simulate the natural physiological state of plants.The purpose of this study is to determine the optimization process of light formula including light intensity,light quality and light cycle according to different crop varieties,simulate the sunrise and sunset process in nature,automatically track the growth of plants,and build the most appropriate light formula for crops with different production goals,so as to achieve the double improvement of crop yield and quality.In order to solve the problem of light regulation in plant factory,this system proposed a logic control strategy aiming at the dynamic demand of plant by means of PLC and Kingview interface,created a multi factor collaborative control technology equipment for precise regulation of light effect and growth or nutrition quality,and realized the automation of energy consumption,output and nutrition quality Control.The innovation of this system is to use accurate light formula technology to automatically track the growth of plants,so that every growth stage of plants is in the most appropriate light environment,and use pulse width modulation method to achieve the purpose of LED light gradually brightening and darkening,so as to simulate the gradual change of light intensity in nature and improve the light efficiency.In this study,we take leaf lettuce as an example to carry out the experiment of substrate cultivation.The main research results and significance are as follows:In this study,a scientific light formula was developed to provide the most suitable light environment for different stages of plants,and simulate the sunrise and sunset of the external environment,so as to achieve the physiological work and rest requirements of plants.Secondly,the LED illumination uniformity of the system is analyzed,and the illumination of the system is more uniform.The overall scheme of the system is designed,including the construction of system hardware and the framework design of PLC software program.The purpose of the light environment rationing scheme is to carry out the segmented dynamic cultivation of plants,and to track the growth of lettuce in all stages.Scientific light formula is helpful to improve the utilization rate and light efficiency.Through the study of growth,physiological and biochemical characteristics of lettuce in different experimental groups,it is found that group A is beneficial to increase the yield and quality of lettuce,and promote the production of soluble protein and total chlorophyll content.Group B was beneficial to the increase of soluble sugar content,and the content of nitrate was less.Group C was beneficial to the increase of carotenoid content.After analysis and comparison,group A is the most suitable for the increase of lettuce yield,which is conducive to the accumulation of physiological and biochemical characteristics.