单片机课程设计60秒倒计时,基于单片机奥运会倒计时
1.利用单片机设计实现一个60秒倒计时显示装置，并且计时到后发出报警声音。
2.单片机 60秒倒计时
#include<reg51.h>
#define uchar unsigned char
uchar code ledtab[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x40};//0-9
unsigned char sec=0,min=0,hour=24,scanled;
unsigned char key,mode,time;
unsigned char disdat[8];
unsigned char alarm[3]={23,59,58},dly;
sbit keyhu=P1^0;
sbit keyhd=P1^1;
sbit keymu=P1^2;
sbit keymd=P1^3;
sbit keysu=P1^4;
sbit keysd=P1^5;
sbit keyst=P1^6;
sbit fmq=P3^0;
bit flag=0;
void delay(unsigned int x)
{
unsigned int i,j;
for(i=0;i<x;i++)
for(j=0;j<120;j++);
}
void dischg()
{
disdat[0]=sec%10;
disdat[1]=sec/10;
disdat[2]=min%10;
disdat[3]=min/10;
disdat[4]=hour%10;
disdat[5]=hour/10;?
}
void t0isr() interrupt 1?//秒计时
{
TH0=0x3c;
TL0=0xb0;
time++;
switch(mode)
{
case 0:
if(time==20)
{
time=0;
sec++;
if(sec>59)
{
sec=0;
min++;
if(min>59)
{
min=0;
hour++;
if(hour>23)hour=0;
}
}
}
break;
case 1:
if(time==20)
{
time=0;
if(sec>0 && flag==0)sec--;
else if(min>0 && flag==0){sec=59;min--;}
else if(hour>0 && flag==0){sec=59;min=59;hour--;}
if((hour == alarm[0]) && (min == alarm[1]) && (sec == alarm[2])){fmq=1;flag=1;dly++;}
}
break;
}
if(dly>=2){fmq=0;flag=0;TR0=0;dly=0;}
dischg();
}
void t1isr() interrupt 3?//显示
{
TH1=0xec;
TL1=0x78;
switch(scanled)
{
case 0:
P2=0x20;
P0=~ledtab[disdat[5]];
break;
case 1:
P2=0x10;
P0=~ledtab[disdat[4]]&0x7f;
break;
case 2:
P2=0x08;
P0=~ledtab[disdat[3]];
break;
case 3:
P2=0x04;
P0=~ledtab[disdat[2]]&0x7f;
break;
case 4:
P2=0x02;
P0=~ledtab[disdat[1]];
break;
case 5:
P2=0x01;
P0=~ledtab[disdat[0]];
break;
default:break;
}
scanled++;
scanled%=6;
}
main()
{
TMOD=0x11;
TH0=0x3c;
TL0=0xb0;
TH1=0xec;
TL1=0x78;
TR1=1;
TR0=0;
ET0=1;
ET1=1;
EA=1;
fmq=0;
scanled=0;
time=0;
mode=1;
dischg();
while(1)
{
if(keyhu==0)
{
while(keyhu==0);
TR0=0;
hour++;
hour%=24;
}
if(keyhd==0)
{
while(keyhd==0);
TR0=0;
if(hour>0)hour--;
if(hour==0)hour=23;
}
if(keymu==0)
{
while(keymu==0);
TR0=0;
min++;
min%=60;
}
if(keymd==0)
{
while(keymd==0);
TR0=0;
if(min>0)min--;
if(min==0)min=59;
}
if(keysu==0)
{
while(keysu==0);
TR0=0;
sec++;
sec%=60;
}
if(keysd==0)
{
while(keysd==0);
TR0=0;
if(sec>0)sec--;
if(sec==0)sec=59;
}
if(keyst==0)
{
while(keyst==0);
TR0=~TR0;
}
dischg();
}
}
利用单片机设计实现一个60秒倒计时显示装置，并且计时到后发出报警声音。
A1 输入 2008-8-8 8:8:8
A2 输入 =NOW()
A3 输入 =A1-A2
A4 输入:
=INT(A3)&"天"&TEXT(A3-INT(A3),"h时m分s秒")
A4 便是倒计时
如要倒计时每秒运行, 便要执行宏, VBA代码:
Sub Olympic()
ActiveSheet.Calculate
Application.OnTime Now + TimeValue("00:00:01"), "Olympic"
End Sub
如需停止倒计时, 要另多写一个宏
单片机 60秒倒计时
#include<reg52.h>
sbit?bz=P3^1;
unsigned?char?a[10]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xd8,0x80,0x90};
unsigned?char?n,time=60;
main()
{
P1=a[0];
P2=a[6];
TMOD=0X01;
TH0=(65536-10000)/256;
TL0=(65536-10000)%256;
EA=1;
ET0=1;
TR0=1;
while(1);
}
timer0()?interrupt?1
{
TH0=(65536-10000)/256;
TL0=(65536-10000)%256;
if(time!=0)
{
n++;
if(n==100)
{
n=0;
time--;
P1=a[time%10];
P2=a[time/10];
}
}
else?bz=~bz;
}
我是用汇编语言做的，如果显示的速度不理想 你改下延时程序段的数值就OK了，课堂上这个60S倒计时的课题用了很多方法做过
ORG 0000H
LJMP START
ORG 0100H
START:MOV R0, #59
MOV DPTR, #TABLE
LOOP:LCALL DISPLAY
DEC R0
CJNE R0,#0,LOOP
JMP START
DISPLAY:MOV A, R0
MOV B, #10
DIV AB
MOV R1, A
MOV R2, B
MOV R3, #50
LOOP1:MOV A, R2
LCALL CHANG
CLR P2.6
LCALL DLY10MS
SETB P2.6
MOV A, R1
LCALL CHANG
CLR P2.7
LCALL DLY10MS
SETB P2.7
DJNZ R3, LOOP1
RET
CHANG:MOVC A, @A+DPTR
MOV P0, A
RET
DLY10MS:MOV R6, #256
D1:MOV R7, #256
NOP
NOP
NOP
NOP
DJNZ R7, $
DJNZ R6, D1
RET
TABLE:DB 28H,7EH,0A4H,64H,72H,61H,21H,7CH,20H,60H
END