毕业设计--基于AT89C52单片机的数字温度计设计

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1、 I 基于单片机的数字温度计设计 摘 要 在日常生活及工业生产过程中，经常要用到温度的检测及控制，温度是生产 过程和科学实验中普遍而且重要的物理参数之一。传统的测温元件有热电偶和二 电阻。而热电偶和热电阻测出的一般都是电压，再转换成对应的温度，这些方法 相对比较复杂，需要比较多的外部硬件支持。我们用一种相对比较简单的方式来 测量。 我们采用美国 DALLAS 半导体公司继 DS18B20 之后推出的一种改进型智能 温度传感器 DS18B20 作为检测元件，温度范围为-55125，最高分辨率可达 0.0625。DS18B20 可以直接读出北侧温度值，而且采用三线制与单片机相连， 减少了外部的硬件

2、电路， 具有低成本和易使用的特点。 本文介绍一种基于 AT89C52 单片机的一种温度测量及报警电路，该电路采用 DS18B20 作为温度监测元件，测 量范围 0+100，使用 LCD 模块显示，能设置温度报警上下限。正文着重给出 了软硬件系统的各部分电路，介绍了集成温度传感器 DS18B20 的原理，AT89C52 单片机功能和应用。该电路设计新颖、功能强大、结构简单。 关键词：温度测量，AT89C52，DS18B20，系统仿真 II Design of Digital Thermometer Based on SCM ABSTRACT In daily life and industria

3、l production process, often used in the detection and control of temperature, temperature is the production process and scientific experiments in general and one of the important physical parameter. Traditional thermocouple and temperature components are the second resistor. The thermocouple and the

4、rmal resistance are generally measured voltage, and then replaced by the corresponding temperature, these methods are relatively complex, requiring a relatively large number of external hardware support. We use a relatively simple way to measure. We use the United States following DALLAS Semiconduct

5、or DS1820 improved after the introduction of a smart temperature sensor DS18B20 as the detection element, a temperature range of -55125, up to a maximum resolution of 0.0625. DS18B20 can be directly read out the temperature on the north side, and three-wire system with single-chip connected to a dec

6、rease of the external hardware circuit, with low-cost and easy use. The introduction of a cost-based AT89C52 SCM a temperature measurement circuits, the circuits used DS18B20 high-precision temperature sensor, measuring scope 0+100, can set the warning limitation, the use of seven segments LCD that can be display the current temperature. The paper focuses on providing a software and hardware system components circuit, introduced the theory of DS18B20, the functions and applications