温度传感系统

- 1 - 《温度检测的系统设计》实验报告专业：电子信息工程学号： 1228401083 姓名：杨海艺指导老师：周鸣籁- 2 - 摘要温度检测系统是一种应用非常广泛且较热门的系统，对现代社会越来越重要。此次温度检测系统设计在硬件方面主要采用STC89C52单片机作为主控核心并通过 1602LCD液晶显示屏显示、 蜂鸣器上下限温度报警实现温度显示；温度检测则是由 铂电阻温度传感器PT100 的热电效应产生的电动差通过桥式差分输入LM324组成的放大电路及低通滤波电路进行放大滤波，然后通过16 位的高精度A/D1100数模转换到单片机进行处理。STC89C52单片机是由 Atmel 公司推出的，功耗小，电压可选用4～6V电压供电；热电阻PT100电阻温度系数为3.9 ×10－3／℃， 0℃时电阻值为 100Ω ，电阻变化率为0.3851 Ω / ℃铂电阻温度传感器精度高，稳定性好，应用温度范围广，是中低温区（-200 ℃～650℃）最常用的一种温度检测器，不仅广泛应用于工业测温，而且被制成各种标准温度计。关键词 : STC89C52；LM324；A/D1100 Abstract Recently,Temperature detection system is a widely used and more popular systems, more and more important in modern society. The temperature detection system design in terms of hardware used mainly as a master STC89C52 microcontroller core and through 1602LCD LCD display, a buzzer sound and temperature alarm limit for temperature display; the temperature is detected by the thermoelectric effect of platinum resistance temperature sensor PT100 power generated by the difference between the differential input bridge consisting LM324 amplifier and low pass filter circuit amplifies the filter, and then by 16 high-precision A / D1100 digital-analog conversion to the microcontroller for processing. STC89C52 SCM was introduced by Atmel's low power consumption, voltage can be selected 4 ~ 6V voltage power supply; RTD PT100 resistance temperature coefficient of 3.9 × 10-3 / ℃, 0 ℃ when the resistance value of 100Ω , resistance change was 0.3851 Ω/ ℃ platinum resistance temper...