1、 I 摘摘 要要 随着时代的发展、社会的进步、科学技术的不断提高,对温度测量的范围 要求不断增大,同时对温度测量的精度要求也不断提高。因此,对如何方便、 精确、实时的测量温度的研究也成为一个重要的研究课题。 本课题设计了一种基于单片机的具有多路采集通道的高精度的数字温度检 测系统。通过对各种温度传感器的研究与比较,对不同实现方案的深入论证, 设计了包括温度信号处理,液晶显示,报警设置等在内的完整系统。本设计的 CPU 采用以 AT89C51 为主控芯片的单片机系统,主要由 18B20 温度传感器作为 信号采集装置,对 8 路温度信号进行采集后在 LCD1602 上显示。 本文主要使用 C 语言
2、进行程序编写,通过程序与硬件仿真的配合,最终可 以实现具有正常监测,指定通道检测,循环通道检测,报警上下限设置、报警 和时钟显示等功能的多路温度检测系统设计。 关键字:关键字:AT89C51,18B20,LCD1602 液晶显示,报警,时钟 II Multi point temperature detection system design Abstract The continuous improvement of science and technology, the temperature measuring range requirements continue to increase
3、, while the temperature measurement accuracy requirements are also rising.Therefore, on how convenient, precise, real-time measurement and control of temperature of the study also become an important research subject. This topic design based on single chip with multiplex acquisition channel of high
4、precision, wide range of intelligent temperature control system.Through a variety of temperature sensor research and comparison of different scheme, argumentation, design including temperature signal processing, liquid crystal display, alarm settings including a complete system.The design of CPU using AT89C51as main control chip microcontroller system, mainly by the 18B20temperature sensor as a signal collecting device, the8 way temperature signal acquisition in a LCD1602