The Design Of Efficient And Intelligent LED Light System In Plant Tissue

Light is one of the important factors in plant tissue culture. The existingartificial light system for plant tissue culture lead to high energy consumption anddifficult to control. A novel smart illumination system is presented. The systemcould help reduce the cost of tissue culture effectively and easy to control. The mainresearch contents are as follows:(1) Hardware design includes red(660nm) and blue(460nm) LEDs, ZigBee wirelessnetwork, terminal controller, light illumination sensor and PC operating software. Inorder to solve the problem in tissue culture, like many connections, manage complexand so on, build a ZigBee network. Design a control system based on STM8Smicrocontroller and REX3U wireless module, complete the goal of light intensityand light quality adjustable. Silicon photocell is selected for photodetector in opticaldetection module. LED light module consists of LED source and constant currentdriver circuit.(2) Software development includes communication protocol, PC HMI, lowermachine execution. Based on ZigBee modules underlying requirements developcommunication transport protocol. Using C#language write PC overall structureand function modules, allowing users easy to use. Using C language write functionmodules in lower machine, completing signal receiving, parsing and processing.(3) An equation for controlling Photosynthetic Photon Flux Density(PPFD) byilluminance is provided according to the principle of photometry. The results showthat the ratio of illuminance and PPFD, deviations between measured values andtheoretical values is3.86%,2.66%respectively. The deviation between given PPFDand actual tissue holder receiving is within5%. The system could supply themaximum illumination intensity of90μmol m-2s1. At65μmol m-2s1, themaximum red and blue ratio is12.(4) Applications developed lighting system, planting dendrobium officinale underdifferent light quality. The results show that the most obvious promoting role in bud number, height, number of sections, section length is red and blue5:1. Differentlight quality have little impact on the dry substance and chlorophyll content.