节水灌溉自动测控系统

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1、节水灌溉自动测控系统2012年4月10日34目录绪论1.1研究现状·································································61.1.1研究背景································································61.1.2研究发展史······························································61.1.3国内研究展情况··········································

2、················71.1.4研究价值································································91.2课题设计的任务和要求······················································91.2.1课题设计要求····························································91.2.2评分标准····························································

3、····92.方案论证···············34···················································92.1方案选择·································································92.2硬件设计思想····························································112.1.1温度传感器的选择························································112.1.2

4、湿度传感器的选择························································122.1.3放大器电路选择··························································122.1.4A/D转换································································122.15电平转换·································································132.1.6键盘电路··

5、······························································132.1.7LED显示电路····························································133.系统模块电路及主要器件···········34·········································143.1主控电路的设计··························································143.1.1核心控制器·············

6、················································153.2电源电路设计····························································173.3A/D转换································································173.3.1A/D转换器······························································183.4温度检测电路设计···················

7、·····································193.4.1ILC7650前置放大器······················································203.5湿度检测电路设计······················································203.5.1湿度传感器···········