1、 毕 业 设 计 （外文翻译材料） 2011 年 6 月 学 院 ： 专 业 ： 学生姓名 ： 指导教师 ： 电气与电子工程学院 电子信息工程 The design Based on AT89S51 miniature soil humidity detector design Abstract: facilitate master soil moisture conditions, design the miniature soil humidity detector. Its hardware system includes signal amplifier circuit, A/D ci
2、rcuit, SCM, micro LCD display and alarm circuit, etc.； Software system includes A/D conversion driver, LCD driver two modules. Proteus software platform based on the design of the system is simulated, and the results show that the system hardware and software design correct and reliable operation. K
3、eywords: soil humidity； Detector； SCM； A/D conversion； simulation TP202 classification number: Chinese Literature identification code: A Section 1 Introduction Agricultural production in the economic development of our country has important position, for farmers Industry production to provide timely
4、 and reliablly technical service has become the heavily meteorological department To response one. Along with the national governments at all levels of agricultural production increasingly heavier Depende on the service, my unit also serve for agriculture, promote for increasing farmers income Many
5、studies, the various problems in agricultural production also widely adjustable Inquiry. Research found that gardening cultivation, greenhouse flowers, awning vegetables one Some valuable varieties of soil moisture, soil has a high requirement, humidity At the time, not only seriously affecting its
6、normal growth, and even cause planting product death Wu, causing serious damage. Farmers Therefore, engaged in this kind of agricultural production.Farmers very need a low cost, small volume and detection reliable soil .Soil humidity detector for water supply, provides the basis. In order to solve t
7、he above asked .Our problem, I unit combined with actual conditions of agricultural production, and the related units designed Home of high precision, to design the low cost of miniature soil moisture detection instrument. Along with the social life progress, peoples quality of life is getting much
8、more better, flowers has become a fashion. Flowers can not only enrich peoples cultural life and is good for mental and bodily health ， but also can improve and purify air, improve health. Water is necessary for flowers growth ,it influences the growth of flowers greatly. Too much water or too littl
9、e, will affect the normal growth and the kind of flower is verious, Different flowers need different amount of water. The needful water, mostly from the soil, in order to control flowers moisture in the soil properly, using PRO - F soil humidity sensor design an automatic watering the flowers system
10、, it may, automatically set for flowers watering according to the humidity limit, in order to meet the need of imperative water. Section 2 composition of the system The whole system consists of SCM, circuit of DAQ, keyboard input and digital display circuit, output controlling circuit etc. circuit o
11、f CAQ is made of 4 SRH and adc , SRH makes flowers soil humidity convert into analog voltage output, adc makes the output of analog voltage convert into digital quantity and send to microcontroller. AT89S52 is adopted, the collectted value of soil humidity is compared with a preset limit soil moistu
12、re, and it makes corresponding judgement according to the compared results, to control the output controlling circuits action. Key-in is used to set the value of soil humiditys limit, LED is used to display the current soil humiditys value. Miniature soil detector signal processing system including
13、soil humidity sensor Device, A/D acquisition circuit, SCM and micro LCD. Its work After cheng is: soil soil wet degrees preach sensor, will wet degrees letter sent to A/D adopt set electricity Road, the A/D conversion, income data digital signal into SCM Processing, finally will processing results s
14、ent to micro LCD display. Section 3 the hardware design of system 3.1 the circuit s working principle The hard thing the original reason system graph as figure 2 shows. This article selects KSC -6V integrated relative humidity sensor, wait for after inserting the soil about 5s make sensor Implement fully contact with the soil, signal by integrated amp LM324 Vin the same phase Input terminal. The sensors relative humidity 0% 100% RH, its corresponding
