The Design Of Temperature And Humidity Monitoring System Base On The Technology Of Embedded System

The development of modern science and technology, give the temperature and humidity monitoring system a new development opportunity. At the same time, there are new requirements in the production and life for temperature and humidity monitoring system, such as quicker response speed, high precision, low power consumption, high level of integration, friendly human-machine interaction, etc. In order to meet the user’s requirements of the temperature and humidity monitoring system, we use embedded system technology in the temperature and humidity monitoring system.Through analysis of the present situation of modern temperature and humidity monitoring technology and demand conditions, and combining the current situation of the development of the embedded system technology, we present a temperature and humidity monitoring project based on embedded system. On the analysis of functional requirements of the of the temperature and humidity monitoring system, this paper design the whole system solutions. Using Senserion’s integrated digital temperature and humidity sensor SHT11for data acquisition module, with Atmel produced Atmega8single-chip microcomputer as control module, applying the RS485BUS Interface for communicating with higher level network, then building the hardware platform, using modular design concepts we divided the hardware circuit into several smaller modules, specific design each module of the hardware circuit; we also using the modular programming thought in software designing, divided the program into several smaller software module, using AVR Studio specific programming for each module, then using Labcenter electronies company’s free simulation software Proteus simulate and test the hardware and software of the. Lastly we carry on function testing based on the hardware and software.Based on the temperature and humidity data conversion formula, which given in the data sheet of Sensirion, we design a kind of simplified transformation formula, at the cost of no loss of data conversion accuracy, reducing the program code and decreasing the program running time."After test the system hardware and software, the results show that the subject of the temperature and humidity monitoring system can be long time stable operating, meet the most user’s function demand and performance requirements, it can quickly and high precision measure the temperature and humidity, and transmit the results through the human-computer interaction reflects to users or through the communication module to the monitoring network.