精密数字温度计毕业论文.doc

摘 要 在日常生活及工农业生产中，对温度的检测及控制时常显得极其重要。因此，对数显温度计的设计有着实际意义和广泛的应用。本文介绍一种利用单片机实现对温度智能控制及显示的方案。本毕业设计主要研究的是高精度的数字温度计的设计，继而实现对对象的测温。测温系统主要包括供电电源、数字温度传感器的数据采集电路、LED显示电路、蜂鸣器报警电路、按键电路、单片机主板电路，数字温度传感器的数据采集电路与单片机主板电路是整个系统的关键。高精度数字温度计的测温过程，由数字温度传感器采集所测对象的温度，并将温度传输到单片机，最终由液晶显示器显示温度值。该数显温度计要求测温范围为－55℃～＋99℃，精度误差在0.1℃以内，LED数码管直读显示。数字式温度计完全可以代替传统的水银温度计,可以在家庭中以及工业中都可以应用,实用价值很高。 关键词：单片机；DS18B20；LED显示 ABSTRACT In our daily life and industrial and agricultural production, the detection and control of the temperature is extremely important. Therefore, the design of the digital thermometer has practical significance and a wide range of applications. This article describes a programmer which use a microcontroller to achieve and display the right temperature by intelligent control .This programmer mainly consists by temperature control sensors, MCU, LED display modules circuit. The main aim of this thesis is to design high-precision digital thermometer and then realize the object temperature measurement. Temperature measurement system includes power supply, data acquisition circuit of digital temperature sensor, LED display circuit, buzzer alarm circuit, keypad circuit, board with a microcontroller circuit, data acquisition circuit of digital temperature sensor and board with a microcontroller circuit is the key to the whole system. The temperature process of high-precision digital thermometer, from collecting the temperature of the object by the digital temperature sensor and the temperature transmitted to the microcontroller, and ultimately display temperature by the LED. The digital thermometer requires the high degree is positive 99 and the low degree is negative 55, the error is less than 0.1,LED can read the number . This digital thermometer could replace the traditional mercurial thermometer , can be used in family or industrial and agricultural production ,it has a great value. Key Words: MCU；DS18B20；LED display1 引言 温度是日常生活、工业、医学、环境保护、化工、石油等领域最常遇到的一个物理量。测量温度的基本方法是使用温度计直接读取温度。最常见到的测量温度