基于AT89C51单片机的智能灌溉系统【毕业论文，绝对精品】.doc

摘 要 水是一切生命过程中不可替代的基本要素，水资源是国民经济和社会发展的重要基础资源。我国是世界上13个贫水国之一，人均水资源占有量只有世界人均水平的l/467％?本设计包括硬件电路设计和软件设计两部分。硬件电路部分主要包括时钟电路设计，复位电路设计，报警电路设计，土壤湿度传感器的选用，主控单片机的选用，数据存储电路和数据采集电路的设计，LED显示部分和串行通信的设计。单片机选用AT89C51；数据存储电路采用外部静态数据存储器6264；数据采集电路采用A/D转换器AD574实现数据转换；设计的显示部分采用6位LED显示，74LS138实现其位选，CD4543实现其段选。土壤湿度传感器将采集到的数据送入A/D转换器AD574，数据存储到外部静态数据存储器6264，最终由LED显示部分显示，读出数据。软件部分包括对主程序、数据采样子程序、数据处理子程序、显示子程序的简单设计。本设计的本系统的硬件电路结构简单、系统的可靠性高 关键词：农业灌溉；单片机；传感器；A/D转换；LED显示 Abstract Water is the essential basic factor for all lifecycles. water resource is the important basic resource for social economics and society development. China is one of the 13 countries in the world which have the shortage problem with water resource. the average water distribution is only a quarter of the world. Production industry and every day life usages have taken up the major part of water usage. Agricultural industry uses up about 67% of the total water resource and it is the major stream for water saving. Making changes to the ways of agricultural industry water usage is the main direction of saving agricultural water usage. Drip irrigation is the most effective technique currently in agricultureal irrigation. This design includes hardware ciruit design and software design.In this topic, the hardware circuit design includes clock circuit design, reset circuit design, alarm circuit design, the selection of soil dampness detectors, the selection of single chip microcomputer, data detection and store design, LED monitor part and serial communication circuit design. Single chip uses AT89C51; data storage circuit uses external stable data storage 6264; data detection circuit uses A/D converter AD574 to achieve the conversion; the display part of the design uses six digits LED monitor, 74LS138 achieves position selection, CD4543 achieves interval selection. Soil dampness detector will transfer detected data to A/D converter AD574; data is stored to external stable data storage space 6264, in the end, the LED monitor