| China is a big country on tfacilities-agriculture in the world. According to statistics, the planting area of solar greenhouse and vinyl tunnel has been reached 330 Kha and 670 Kha respectively in our country at present, but the modernization progress of facilities-agriculture was quite slow. The survey data from some parts of Shaanxi Province and Yangling demonstration zone showed that the temperature and humidity monitoring system in new greenhouse was used very few due to the high runing cost, difficult to maintain and low cost performance. As a result, lots of small rural family and enterprises still check the temperature, humidity in manual. In some case, even someone was appointed to watch the meters for guiding agricultural activities. It low low efficiency and labor cost.In this paper, A cell phone alarm system by short message for monitoring temperature and humidity of greenhouse based on SCM was developed to resolve the problems of low efficiency of artificial monitoring and early warning on limited value of temperature-humidity threshold without people check according to the characteristics of small farmers, the GSM wireless communication technology, CSM as the processor and the digital temperature and humidity sensor with high accuracy as the determination equipment. It not only was labor saving, but also the demand for saving and analyzing of historial data of temperature and humidity was satisfied in environment of facility-agricultre. Through field test, the measuring error of the system is smaller, normal on sending and receiving of text messages. It was practical and reliabile with higher application value. The main contents of the study were following as:(1) The complete scheme of hardwear and softwear for determining temperature and humidity based on STC12C5 A type of SCM was designed and researched.(2)The performance demand of system parameters was presented. Some components were choosed and the corresponding interface circuit was designed.(3)The technology difficulty of application, text messages trsnmission, information display of the Short Message transmission function of TC35 i module was evaluated.(4)The design strategy of software and interface circuit of the hardware were designed to store historial data of temperature and humidity acquisition in the SD/TF memory card.(5)The infrared remotor was developed as an interface-keyboard. It is more convenient on change alarm set value of the temperature and humidity, time, date, alarm code and all the other parameters of the system.(6) The design of man-machine interface of the temperature and humidity monitoring and alarm system on LCD screen was completed. The actual value of the temperature and humidit the set value, the actual value of the time, date and other information can be displayed real-time, on which the remote control keyboard can be assist to change the relevant system parameters and set up a friendly man- machine interface.(7) The design and regulation of the hardware and software of whole system was completed. The test results in the plastic greenhouse field verified that the system if efficient and reliable on performance. |
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