Based On S3C2440A Design Of Temperature And Humidity Measurement And Control System

This thesis adopts the embedded system based on ARM9 as the host computer system,with the smallest single-chip system with 51 single chip as the main control chip is used as a controller,a temperature and humidity sensor is a composite type digital signal output display chip DHT11.The measurement and control network for the forms of the bus network,suitable for large granary environment.The structure of the whole system can be divided into three parts: data acquisition module,the host computer and lower machine.The data acquisition module granary environment in greenhouse value and sends the data to the computer terminal for the whole system.The machine is a bridge to connect the data acquisition module and PC,it receives the transmitted data acquisition module to data,to encode the data information into the barn, number and the number of acquisition point,and transmits the processed data to the host computer terminal.The host computer is the core of the system control module and data processing module,it receives the next bit machine to send the data,data analysis on the same data set of the granary,produced after the operation instruction.The PC will send commands through the ventilation equipment,the control system of temperature and humidity of the environment within the scope of the barn in this way.The intelligent automatic control and manual control of two control modes are set up, and the man-machine interface of the QT is designed.The operator can control the whole system through the man-machine interface QT.In the intelligent control mode,the operator can according to the actual situation of the local barn ventilation condition set,the system according to the set temperature and humidity conditions automatically control.In the manual control mode,the system is provided with the corresponding operable keys for each ventilation device,and the operator can directly control the switch of the ventilation equipment according to the current temperature and humidity values.Manual control mode is designed primarily to system appears abnormal operation personnel to carry out emergency treatment,to avoid the loss of stored grain.