Design of greenhouse monitoring and control system based on LED lighting

Abstract

LED light source module is developed according to the design of light distribution of RRGB chip based on the demand of plants for light, temperature and humidity. Several light source modules constitute LED array planar light source module. Monitoring and control of the system is realized through the combination of upper computer based on LabVIEW and controller. The controller conducts real-time detection on photon flux density (PFD) of red, green and blue bands, temperature and humidity and displays the detection information on the interface of upper computer. Pulse width modulation (PWM) signal is adjusted dynamically through the controller so as to make PFD value of plants under lighting remain constant, thus realizing intelligent fill lighting of the lighting system in combination with ambient light. Meanwhile, the system also realizes intelligent adjustment of temperature and humidity threshold range. This intelligent fill lighting system meets the requirement of plants for fill lighting environment and greatly saving energies through the setting of different PFD values and temperature and humidity ranges of red, green and blue bands by upper computer and the completion of environmental control by lower computer according to the setting based on different fill lighting demands of different plants or the same plant in different growth stages for PFD and light quality ratio.