基于单片机的光照度传感器设计-毕业设计 下载本文

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重庆邮电大学 毕业设计(论文)

设计(论文)题目: 基于单片机的光照度传感器设计

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重庆邮电大学本科毕业设计(论文)

摘 要

在科学技术迅猛发展的现代,作为信息获得的一种重要途径——传感器技术得到广泛的应用,其在各个行业中发挥着不可替代的作用,同时对传感器的要求与要求显著提高。传感器技术对于一个国家的科学发展水平有着重大的决定性作用。因此,了解并掌握各类传感器的基本结构、工作原理及特性是非常重要的。传感器可以方便的将检测到的模拟信号转化为便于运算处理的数字信号,在现在社会中得到了广泛的运用。

本设计采用光敏电阻为光传感器,光敏电阻阻值随光照强度的变化而变化(入射光强,电阻减小;入射光弱,电阻增大),利用光敏电阻的光照特性完成光强的检测。该设计可分为三部分:即光照检测部分、信号处理部分、光强显示部分。具体方法是将光敏电阻与一定值电阻串联接入电路,光照强度的变化会引起光敏电阻阻值的变化,从而影响电路电流及电压值的分布,将模拟电压通过ADC0804模数转换器转换为数字电压,通过VC语言编程,将其集于单片机AT89C51中进行处理,并将其通过液晶屏显示出来。本设计电路结构简单,成本相对较低,通过对光敏电阻阻值的变化的运算处理,从而检测不同的光照强度,实用性较强。

【关键词】光照强度 传感器 A/D转换 单片机

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重庆邮电大学本科毕业设计(论文)

ABSTRACT

With the science and technology developing rapidly today, as a means of obtaining information——the sensor technology got the remarkable progress, its field application is getting more and more wide. Also, its standard has being higher and higher and its demand has being more and more urgent. The sensor technology has become one of the important marks of the national science and technology development level. Therefore, it is very important to understand and grasp the basic structure of all kinds of sensors. Sensors can easily transform the analog signals to digital signals which is facilitate computing and its has a wide range of application in society.

The project use photoconductive resistance as a sensor of light intensity, the tolerance of the photoconductive resistance changes when the light intensity changes(the incident light strong, resistance decreased; the incident light weak, resistance increased). The project can be divided into three parts: testing part, processing part and displaying part. The concrete methods is taking a photoconductive resistance and a certain value resistor in a series access circuit, the tolerance of the photoconductive resistance changes when the light intensity changes then the voltage changes. We use the ADC0832 to transform the analog signals to digital signals and using AT89C51 to processing the data through programming with Visual C, then display the result through LCD screen. The design has a simple circuit structure, relatively low cost and we can easily know the change of th light intensity through the change of the tolerance of the photoconductive resistance.

【Key words】Light intensity Sensor A/D conversion Microcontroller

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