温湿度测量系统设计(精）.doc

河南城建学院本科毕业设计( 论文) 摘要 I 摘要本毕业设计设计了一个宽量程多点智能化的温湿度监测应用系统。随着科学技术的日新月异,人类社会取得了长足的进步!在居家生活、工农业生产、气象、环保、国防、科研、航天等部门,经常需要对环境中的湿度和温度进行测量及控制。本系统采用技术成熟的 SHT11 芯片作为测量湿度和温度的传感器。 SHT11 是内部集成 IIC总线接口的单片全校准数字式新型相对湿度和温度传感器。SHT11 具有数字式输出、免调试、免标定、免外围电路及全互换的特点。SHT11 全量程标定, 并且可以二线数字输出。SHT11 的湿度测量范围为 0—100% Rh,温度测量范围为-40 ℃—+ ℃,湿度测量精度为±% Rh,温度测量精度为± ℃,响应时间<4s; 内部自带信号调理电路和 A/D 转换电路。控制系统芯片采用技术成熟,功能强大、价位低廉大众化的 AT89C51 单片机。 LED 显示电路, 声光报警电路都由 AT89C51 单片机控制。同时设计了能给系统提供稳定工作电压的电源电路。为了提高系统的抗干扰性能,对湿度、温度的检测采用了硬件抗干扰和软件抗干扰的综合方法。硬件采抗干扰措施采用集成看门狗芯片 DS1232 ,它使系性能得到了改善。最后设计了系统各个功能部分的软件程序。在设计中,对误差产生的原因也进行了一些理论上的分析,并证明了这种设计方案是可行的。由本设计课题做成的温湿度检测系统结构简单、价格便宜、量程宽,具有较高的可靠性、安全性及实用性。关键词:单片机 SHT11 温湿度传感器 IIC 总线接口河南城建学院本科毕业设计( 论文) 摘要 II ABSTRACT This paper has designed an intelligent temperature and humidity measurement system with many measuring points. With the new science and technology increasingly, our society has made great progress! In the industrial and agricultural production , meteorology , environmental , national defense , scientific research , aerospace , and other departments, it is usually necessarily to measure and control the environmental temperature and humidity. The work rapid development ofa more long-range temperature and humidity control of the increasingly mature. This system uses the technology mature SHT11 as temperature and humidity-measuring the sensor. SHT11 is IICbus interface with the monolithic whole new digital calibration of relative humidity and temperature sensors. SHT11 with digital output for debugging , for calibration , for the external circuit and the characteristics of the whole exchange. SHT11 has the whole range calibration , and can second-line digital output. The humidity range of -40 ℃—+ ℃, humidity measurement range of0— 100%Rh,humidity measurement accuracy of± %Rh , temperature measurement accuracy of± ℃,response time <4s;have its own internal signal conditioning circuit and A/D converter conversion circuit. The control use technology is mature ,