一个液晶显示的数字式电脑温度计

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'. 一个液晶显示的数字式电脑温度计

文章来源：遥控网

液晶显示器分很多种类，按显示方式可分为段式，行点阵式和全点阵式。 段式与数码管类似，行点阵式一般是英文字符，全点阵式可显示任何信息，如汉字、图形、图表等。这里我们介绍一种八段式四位LCD显示器，该显示器内置驱动器，串行数据传送，使用非常方便。原理图如下图：

下图是长沙太阳人科技开发有限公司生产的4位带串行接口的液晶显示模块SMS0403

的外部引线简图： .

'.

关该模块的具体参数，请查看该公司网站。此例中使用的温度传感器为美国DALLAS公司生产的单总线式数字温度传感器。该传感器本站有其详细的资料可供下载。此例稍加改动，即可做成温控器。

本例介绍一种用LED制作的电脑电子钟（电脑万年历）。其制作完成装潢后的照片如下图：

点击看大图

上图中，年、月、日及时间选用的是1.2寸共阳数码管，星期选用的是2.3寸数码管，温度选用的是0.5寸数码管，也可根据个人的爱好选用不同规格的数码管。原理图如下图所示： .

'.

上图中，CPU选用的是AT89C2051,时钟芯片选用的是Dallas公司的DS1302,温度传感器选用的是Dallas公司的数字温度传感器DS1820，显示驱动芯片选用的是德州仪器公司的TPIC6B595,也可选用与其兼容的芯片NC595或国产的AMT9595。整个电子钟用两个键来调节时间和日期。一个是位选键，一个是数字调节键。按一下位选键，头两位数字开始闪动，进入设定调节状态，此时按数字调节键，当前闪动位的数字就可改变。全部参数调节完后，五秒钟内没有任何键按下，则数字停止闪动，退出设定调节状态。源程序清单如下(无温度显示程序）：

start:do;

$include(reg51.dcl)

declare (sclk,io,rst) bit at (0b3h) register; /* p33,p34,p35 */

declare (command,data,n,temp1,num) byte;

declare a(9) byte;

declare ab(6) byte;

declare aco(11) byte constant (0fdh,60h,0dah,0f2h,66h,0b6h,0beh,

0e0h,0feh,0f6h,00h);

declare week(11) byte constant (0edh,028h,0dch,7ch,39h,75h,0f5h,

2ch,0fdh,7dh,00h);

declare da literally 'p15',clk literally 'p16',ale literally 'p17',

mk literally 'p11',sk literally 'p12';

clear:procedure;

sclk=0;io=0;rst=0;

end clear; .

'. send1302:procedure(comm);

declare (i,comm) byte;

do i=0 to 7;

comm=scr(comm,1);

io=cy;

call time(1);

sclk=0;

call time(1);

sclk=1;

end;

end send1302;

wbyt1:procedure(com,dat);/*字节写过程*/

declare (com,dat) byte;

call clear;

rst=1;

call send1302(com);

call send1302(dat);

call clear;

end wbyt1;

wbyt8:procedure;/*时钟多字节突发模式写过程*/

declare j byte;

call clear;

a(7)=A(6);a(6)=a(0);

rst=1;

call send1302(command);

do j=1 to 8;

call send1302(a(j));

end;

call clear;

end wbyt8;

RBYT1:PROCEDURE;

DECLARE I BYTE;

CALL CLEAR;

RST=1;

call send1302(0c1h);

IO=1;

DO I=0 TO 7;

SCLK=1;

SCLK=0;

CY=IO;

N=SCR(N,1);

END;

A(8)=N;

CALL CLEAR; .

'. END RBYT1;

send595:procedure;

declare k byte;

do k=0 to 7;

data=scr(data,1);

da=cy;

clk=1;

clk=0;

end;

end send595;

send595_1:procedure;

declare k byte;

do k=0 to 7;

data=scr(data,1);

da1=cy;

clk1=1;

clk1=0;

end;

end send595_1;

rb1:procedure(abc,j);

DECLARE (I,j,abc) BYTE;

CALL CLEAR;

RST=1;

call send1302(abc);

IO=1;

DO I=0 TO 7;

SCLK=1;

SCLK=0;

CY=IO;

N=SCR(N,1);

END;

ab(j)=N;

ab(j)=dec(ab(j));

CALL CLEAR;

end rb1;

rbyt6:procedure;

call rb1(0f1h,0);

call rb1(0f3h,1);

call rb1(0f5h,2);

call rb1(0f7h,3);

call rb1(0f9h,4);

call rb1(0fbh,5);

call rb1(0fdh,6);

end rbyt6; .

'. wbyt6:procedure;

call wbyt1(8eh,0); /* write enable */

call wbyt1(0f0h,ab(0));

call wbyt1(0f2h,ab(1));

call wbyt1(0f4h,ab(2));

call wbyt1(0f6h,ab(3));

call wbyt1(0f8h,ab(4));

call wbyt1(0fah,ab(5));

call wbyt1(0fch,ab(6));

call wbyt1(8eh,80h); /* write disable */

end wbyt6;

rbyt8:procedure;/*时钟多字节突发模式读过程*/

declare (i,j) byte;

call clear;

rst=1;

call send1302(command);

io=1;

do j=1 to 8;

do i=0 to 7;

sclk=1;

call time(1);

sclk=0;

cy=io;

n=scr(n,1);

end;

a(j)=n;

end;

call clear;

a(0)=a(6);a(6)=A(7);

a(0)=a(0) and 0fh;

if a(0)>6 then a(0)=0;

CALL RBYT1;

if (a(1)=0 and a(2)=0 and a(3)=0) then

do;

do num=0 to 35;

call time(250);

end;

temp1=1;

end;

if temp1=1 then

do;

temp1=0;

ab(4)=ab(4)+1;

if ab(4)>99h then .

'. do;

ab(4)=0;

ab(5)=ab(5)+1;

if ab(5)>99h then ab(5)=0;

end;

call wbyt6;

end;

end rbyt8;

display:procedure; /*jieya,yima,fasong*/

declare (i,n,m) byte;

n=a(0) and 0fh; /* send week */

data=week(n);

call send595;

n=a(4); /* send date */

n=n and 0fh;

data=aco(n);

call send595;

n=a(4);

n=shr(n,4);

data=aco(n);

call send595;

do i=1 to 3; /* send second,minute,hour */

n=a(i);

n=n and 0fh;

data=aco(n);

call send595;

n=a(i);

n=shr(n,4);

data=aco(n);

call send595;

end;

do i=5 to 6; /* send month,year */

n=a(i);

n=n and 0fh;

data=aco(n);

call send595;

n=a(i);

n=shr(n,4);

data=aco(n);

call send595;

end;

n=a(8); /* send 19 or 20 */

n=n and 0fh;

data=aco(n);