Research On Measuring And Controlling System For Temperature And Humidity In Multi-Incubator Based On MCU

Along with the rapid development of electronic,computer and control technology, Agricultural automation has developed to a new stage.Hatch measuring and control system is one of the applications of the bionies.It imitates the natural hatching environment and provides the fitting condition of the embryo upgrowth.This article based on this deficiency and designed measuring and controlling system for temperature and humidity in multi incubators based on MCU.The current situation and development direction of hatching systems inside and outside the country were described.Introduced the hatching principle;designed technical standard of the system referred to the hatching profession;carried out the hardware circuit design.1.For the accuracy of temperature measurement and the cost control,use digital single data line temperature sensor DS18B20,establishes many temperature measurement spots;Using HSll01 to build frequency electric circuit to examine humidity.2.Designed real time data display electric circuit to display incubator condition:The hypothesis temperature,the current temperature,the hypothesis humidity,the current humidity,the heating condition,wet-adding condition,egg-turning condition.3.Designed the output control circuits by electro-optical coupler TLP521 and power actuation chip ULN2803AG as well as the solid state relay.This electric circuit movement is stable,and has no disturbance to the monolithic integrated circuit main circuit.Designed temperature and humidity fuzzy control algorithm.The incubator is separated into three subsystems:temperature control subsystem,humidity control subsystem and wind control subsystem.Temperature is the most important condition of hatching.Choose temperature-wind couplets primarily,and humidity-wind couplets auxiliary fuzzy control algorithm.Designed program of MCU and the superior management software.Designed the hatching simulation box and carried on the system test experiment.It is proved that this system can measure and control temperature within the error of±0.1℃,can measure and control humidity within the error of±10%RH.It can distributedly control multiincubators. The system cost is inexpensive,and it is suitable for the medium hatching factory.