毕业设计--数字温湿度计的设计论文.doc

东 莞 理 工 学 院 本 科 毕 业 设 计 毕业设计题目：温湿度控制器 学生姓名： 学 号： 系 别： 专业班级： 指导教师姓名及职称：刘华珠 高级工程师 起止时间：2011年11月—— 2012年6月 摘 要 本论文介绍了一种以单片机STC12C5A60S2为主要控制器件，以为温度传感器。主要包括硬件电路的设计和系统的设计。硬件电路主要包括控制器，测温电路显示电路等控制器用单片机，温传感器显示电路采用位共极LED数码管。主要包括主程序，温子程序显示子程序等。关键词，ABSTRACT This paper presents a new design of digital thermometers and hygrometer. It includes a main control device-microcontroller STC12C5A60S2 and a temperature and humidity sensor. This design includes hardware and system software .The hardware design includes a main controller circuit, Temperature and Humidity measurement and control circuits and show circuit. Main controller uses SCM STC12C5A60S2，temperature sensor uses PT100，and humidity sensor uses SHT15，Show circuit is a total of eight circuits using digital LED of the Altogether. Driver show circuit uses atches (74573). Temperature and Humidity control circuit includes the temperature and humidity sensor and preset temperature and humidity values compared alarm circuit. When the actual measurement of temperature or humidity values is greater than the preset temperature or humidity values, the alarm signal (Light emitting diode is lit) is sent. And output circuit will be sent(Relay action) .The major software includes the main routines, temperature and humidity routines, show routines and digital-to-analog routines. The humidity sensor (SHT15) in this design includes a capacitive polymer sensing element for power consumption makes it the ultimate choice for even relative humidity and a band gap temperature sensor. Both the most demanding applications are seamlessly coupled to a 14bit analog to digital converter with a 14 and the A / D, as well as serial interface circuits in the same chip on the realization of a Gap link to a super-fast response, anti-interference capability and cost-effective advantages.And PT100 within the required range linearity is very good.The design of digital thermometers and hygrometer with STC12C5A60S2 and PT100 and SHT15, not on