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成人高等教育 毕 业 论 文（设 计） 题 目：多功能湿度数字显示及控制系统的研制 院 别： 继续教育学院 班 级：13级电气自动化技术或机电一体化专科 姓 名： 张 三 学 号： 2013********** 指导教师： 李 四 日 期： 2015年10月 多功能温湿度数字显示及控制系统的研制 摘要 本设计系统地设计了集温度与湿度采集、控制范围设置、声光报警、环境温湿度调节及液晶显示等多功能的实时控制系统。经过多次的运行与检测，实践证明该电路工作稳定，显示清晰。本设计思路明晰，可拓展空间大。其可广泛适用于与人民日常生活、工农业生产有关的温湿度测量以及加热制冷设备控制。 关键词：温度；湿度；单片机；液晶显示屏  ABSTRACT With the development of the national economy and power demand is growing, electricity production safety problems are more and more attention. From the actual operation of transmission line lightning hazard line experience, safe and reliable operation of the main reason. Atmospheric lightning activity due to the randomness and complexity, the world of the lightning s understanding research still has a lot of unknown composition. In view of this, this article in view of power system transmission line lightning on the impact analysis, and discusses its preventive measures. The harm of lightning on distribution line distribution line is directly facing the user power supply circuit, power distribution lines due to insulation level is low, the main consequences of lightning hazard for tripping, disconnection, wherein disconnection is relatively frequent, especially on the overhead insulated line, directly cause on the users power outage time longer, often. Effect of lightning on distribution line is mainly: overhead lines to produce lightning overvoltage has two kinds, one is caused by direct lightning stroke and line lightning overvoltage, another kind is the lightning lines near by electromagnetic induction of lightning overvoltage caused by. Distribution line lightning about 20% of thunder, of which more than 50% lightning current exceeds 20kA, about 80% are induction thunder, of which more than 95% induction lightning discharge current is less than 1000A. Distribution circuit insulated low levels, even set lightning lines will also prevent direct lightning counterattack,