The Design Of Indoor Environment Monitoring System Based On Wireless Transmission

With the development of modern information technology faster and faster, it also makes people’s living standard has undergone enormous changes. Now most of the people on the environment quality is getting more attention, whether it is learning, life and work, most of the time spent indoors. Therefore the indoor environment monitoring has become a topic which worthy of study. C urrently, the indoor environment monitoring instruments on the market exist the disadvantages of single function, high cost, etc. so the design of a low cost, strong practicability, with real-time remote transmission function of the indoor environment monitoring system has far-reaching significance.This thesis presents an indoor environment monitoring system based on wireless transmission of temperature, humidity, light intensity, smoke density four environmental parameters to be monitored. The system consists of two parts: data acquisition terminal equipment and center data monitoring system. The data acquisition terminal equipment mainly realizes the collection, processing and transmission of environmental parameters, and the remote real-time display and alarm of environmental parameters is accomplished by the center data monitoring system. Data acquisition terminal equipment is mainly composed of sensor circuit, signal conditioning circuit, master control circuit, GPRS module, display circuit, power circuit and so on. The sensor part consists of PT100, DHT11, BH1750 FVI and MQ-2, completes the capturing of temperature, humidity, light intensity, smoke density, The signal conditioning circuit mainly carries on the processing for the temperature signal and the smog signal in order to facilitate the follow-up gathering. The main control chip using low cost 8-bit AVR microcontroller ATmega128, it completes the analog digital conversion of the temperature parameter, self-checking and configuration of GPRS module, the analysis and processing, transmission and display operation of data,. The environment data of lower computer is displayed by 12864 liquid crystal. Wireless communication via GPRS module SIM900 A, complete the real-time environmental data transmission to the Internet. Center Data monitoring using C++ language to design the interface, the UDP protocol is used to complete the network communication, through the Internet access to get the data send by lower computer, and the environmental parameters display in real time through the window interface, and it describes the trends of the various parameters, moreover, the upper computer also has alarm setting and display functions.This design of wireless transmission of indoor environmental monitoring system has been the reality test, the results show that the system is stable, reliable and convenient, meets the overall design goals and functional requirements, moreover, the accuracy of the collected environmental parameters can meet the specified range, and can complete the precision measurement of indoor environmental parameters,this system has a certain practical value.