摘 要

随着社会的发展、科技的进步以及人们生活水平的逐步提高，各种方便于生活的自动控制系统开始进入了人们的生活，以单片机为核心的检测数字显示系统就是其中之一。同时也标志了自动控制领域成为了数字化时代的一员。它实用性强，功能齐全，技术先进，使人们相信这是科技进步的成果。它更让人类懂得，数字时代的发展将改变人类的生活，将加快科学技术的发展。

此设计通过对“仓库温度测试及显示系统”的测试,了解仓库是否在规定的允许温度内，本论文着重阐述了以单片机为主体，LED动态显示芯片及A/D转换芯片的核心系统。

本设计主要应用8051作为控制核心，LED动态显示芯片、采用AD590温度传感器，特不仅具有较高的精度，而且有良好的非线性。考虑到强电的干扰将影响到点片机的正常工作，设计了强电隔离装置。A/D转换芯片ADC0809相结合的系统。充分发挥了单片机的性能。其优点硬件电路简单，软件功能完善，控制系统可靠，性价比较高等特点，具有一定的使用和参考价值。

关键词：A/D模数转换 传感器 单片机控制 LED显示

Abstract

Progress of with the development of society , science and technology and gradual improvement of people's living standard, various kinds of help automatic control system in life begin to enter people's life, the digital displaying system automatically taking one-chip computer as the core is one of them. Indicate too that the automatic controlled field became a member in digitized era at the same time. Its practicability is strong, multiple functional, modern techniques, make people believe this is an achievement of scientific and technological progress. It lets the mankind understand even more, the development in digital era will change human life, will quicken the development of science and technology.

This is a disign that it pass to test " Warehouse temperature testing and display system ", understand Warehouse can whom and safe operation design control detection system under in one-chip computer, Thesis this is it rely mainly on one-chip computer to explain emphatically, LED lattice show chip and walk into electrical machinery central systems.

Is it use 8051 as core of controlling , LED lattice show chip , temperature sensor , ADC0809 conversion COMS chip that device combine together mainly to design originally. Give full play to the performance of the one-chip computer. Its advantage hardware circuit is simple, the software is with perfect function, the control system is reliable , higher characteristic of the sex price, have certain use and reference value.

Keyword: The one-chip computer controls  A/D modulus and changes Sensor  LED to show

目 录

1          绪论……………………………………………………………………1

2          系统硬件设计………………………………………………………… 3

2.1       硬件设计框图…………………………………………………… 3

2.2       测温电路的设计…………………………………………………3

2.2.1    温度传感器AD590简介…………………………………… 3

2.2.2    放大滤波电路的设计………………………………… 5

2.2.3    晶闸管主电路及驱动电路的设计………………………… 6

2.3       ADC0809转换芯片……………………………………………… 11

2.4       单片机…………………………………………………………… 15

2.4.1    单片机的概述…………………………………………… 15

2.4.2    单片机微处理器系列介绍………………………………15

2.5       CPU的选择及应用………………………………………………16

2.5.1    8051单片机 ……………………………………………… 16

2.5.2    8051的应用 ……………………………………………… 19

2.6       LED显示器…………………………………………………20

2.7       报警装置…………………………………………………………23

2.8       硬件原理图………………………………………………………23

3          系统软件设计……………………………………………………25

3.1       软件设计思想……………………………………………………25

3.2       系统程序流程图…………………………………………………26

3.3       各功能模块软件程序设计………………………………………28

4          抗干扰系统的设计……………………………………………34

4.1       干扰渠道，分类及后果…………………………………………34

4.1.1    干扰的分类………………………………………………34

4.1.2    干扰的后果………………………………………………34

4.2       抗干扰技术………………………………………………………35

4.2.1    硬件抗干扰技术…………………………………………35

4.2.2    软件抗干扰技术…………………………………………37

4.3       系统可靠性设计…………………………………………………39

结论…………………………………………………………………………41

致谢…………………………………………………………………………42

参考文献………………………………………………………………… 43