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1
设计要求
■基本范围
-50
℃
-110
℃
■精度误差小于
0.5
℃
■
LED
数码直读显示
2
扩展功能
■实现语音报数
■可以任意设定温度的上下限报警功能
数字温度计
摘要:
随着时代的进步和发展,单片机技术已经普及到我们生活,工作,科研,各个领
域,
已经成为一种比较成熟的技术
,
本文将介绍一种基于单片机控制的数字温度计,
本温
度计属于多功能温度计,
可以设置上下报警温度,
当温度不在设置范围内时,
可以报警
。
1
引言
随着人们生活水平的不断提高
,
单片机控制无疑是人们追求的目标之一,它所给人带来的方便也
是不可否定的,其中数字温度计就是一个典型的例子,但人们对它的要求越来越高,要为现代人工
作、科研、生活、提供更好的更方便的设施就需要从数单片机技术入手,一切向着数字化控制,智
能化控制方向发展。
本设计所介绍的数字温度计与传统的温度计相比,具有读数方便,测温范围广,测温准确,其
输出温度采用数字显示,主要用于对测温比较准确的场所,或科研实验室使用,该设计控制器使用
单片机
A
T89S51
,测温传感器使用
DS18B20
,用
3
位共阳极
LED
数码管以串口传送数据
,
实现温度
显示
,
能准确达到以上要求。
2
总体设计方案
2.1
数字温度计设计方案论证
2.1.1
方案一
由于本设计是测温电路,可以使用热敏电阻之类的器件利用其感温效应,在将随被测温度变化
的电压或电流采集过来,进行
A/D
转换后,就可以用单片机进行数据的处理,在显示电路上,就可
以将被测温度显示出来,这种设计需要用到
A/D
转换电路,感温电路比较麻烦。
2.1.2
方案二
进而考虑到用温度传感器,在单片机电路设计中,大多都是使用传感器,所以这是非常容易想
到的,所以可以采用一只温度传感器
DS18B20
,此传感器,可以很容易直接读取被测温度值,进行
转换,就可以满足设计要求。
从以上两种方案,很容易看出,采用方案二,电路比较简单,软件设计也比较简单,故采用了
方案二。
2.2
方案二的总体设计框图
温度计电路设计总体设计方框图如图
1
所示,控制器采用单片机
AT89S51
,温度传感器采用
DS18B20
,用
3
位
LED
数码管以串口传送数据实现温度显示。