ARM数字式温湿度数据采集系统设计
毕业论文关键词 ：温湿度测量 ARM 半导体传感器 RS-485
Title Digital Temperature and Humidity Data Acquisition System Abstract Temperature and humidity acquisition is widely used in industry, scientific research, agricultural, medical and other fields. The traditional temperature and humidity acquisition System uses a thermal resistance to measure temperature, through the dry- ball temperature and the wet-ball temperature measure relative humidity. With the development of semiconductor technology, intelligent temperature and humidity sensor gained popularity. This paper designed a kind of temperature and humidity acquisition system adopted by ARM. The system's hardware part uses ARM Cortex-m0 micro-controller, uses the SHT11 sensor measure humidity, using DS18B20 sensor measure temperature, send data to the computer by RS485 interface in time. According to the requirements, the software part contains the main program, humidity collection procedures, temperature acquisition procedures, as well interface communication procedures. Software part adopts C language programming, overall framework of the concise and clear ideas, and meet the design requirements. The system showed in this paper is a high accuracy and high performance system; meet all of the design requirements. We can see the measurement systems that use semiconductor sensors will be more and more widespread in the future.
Keywords ： Temperature and Humidity Detection ARM Semiconductor Sensors RS-485
目 次
1 绪论 1
1.1 温湿度测量技术的发展状况1
1.2 设计要求和指标1
2 系统设计方案 2
2.1 系统基本功能 2
2.2 硬件设计框图 2
2.3 微处理芯片的选择2
2.4 温湿度传感器选择3
2.5 通讯接口的选择3
2.6 本章小结4
3 硬件设计 5
3.1 微处理器设计5
3.2 温湿度敏感元件10
3.3 通讯接口设计13
3.4 LCD 液晶屏设计14
3.5 本章小结15
4 软件设计17
4.1 温度传感器软件设计17
4.2 通讯接口软件设计25
4.3 上位机系统设计27
4.4 本章小结27
结论 28
致谢 29
参考文献30
1 绪论 温湿度测量在工业生产和日常生活中有着广泛的应用，传统的温湿度测量方式通常为使用水银温度计或酒精温度计测量温度，利用干湿球温度差得到并不精确的湿度值。这种采集方法会消耗大量人力资源，难于管理，并且测量精度不甚理想。