（论文 字数：24030页数：37）摘要 ：本次设计的智能体温仪主要硬件部分由温度传感器、信号放大电路、A/D转换电路、CPU控制电路、存储器电路、液晶显示模块构成。温度传感器（PT100）每隔1秒钟便将测得的温度变化转化成电压信号后,经弱信号检测放大器进行放大，由A/D转换器转换成数字信号.，然后由单片机读取数字信号再进行温度数值转换,并转换为字符信号(ASCΙΙ码)送到LCD进行温度显示。当所测温度超出人体正常体温时便会发出报警信号，报警温度在程序内设置,并且可以通过单片机编程进行时间显示（该仪器附带时钟功能）。此外，电源的供电为常用的5V，±12V。

关键字：铂电阻,四线式接法,单片机,LCD显示器。

Abstract: The hardware of this intellectualized thermometer of this design are as follows: the temperature transducer, signal magnifying circuit, A/D transition circuit, CPU controlling circuit, memorizer circuit and LCD module. The temperature transducer (PT100) measures the changes of temperature every second and transforms it into a voltage, after being it has been magnified by the signal magnifier, it will be transformed into digital signals by the A/D transition circuit. The SCM will read the digital signals and transform them back into a temperature in the form of character signal (ASCΙΙ code), and then shown it on the LCD screen. When the measured temperature is above the ordinary one of a human body, it will send out the alarming message. The alarming temperature is set within the program, and the time of it can be shown by the SCM through a certain program (this device contains a time function). And plus, the power supply should be the normal 5V, ±12V.

Keywords: PT-Transducer Four-wire-connection SCM(Single Chip Micyoco) Liquid Crystal Display

目录

一．摘要
二．方案设计与论证
三．电路设计
四．整机安装调试及数据结果
五．总结
六．致谢
七．附录
二．方案设计与论证
体温计主要实现温度的测量和读取并且要求一定的精度和误差,要求精度不大于0.10C,误差尽可能小( ).精度和误差是温度传感器的的主要性能指标,因此,温度传感器的选择是本次设计的重要问题,其性能参数直接关系到整机测量温度的精度和误差.而对时间的精度要求不是很高,所以设计要考虑的是温度传感器的选用和所测温度的显示.