Question

我想用51单片机做一个篮球计时器24秒倒计时，用数码管显示，求各位高手帮忙画电路原理图，谢谢

Answer 1

#include "reg51.h"
#define uchar unsigned char
uchar display_code[]={0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90,0x88,0x83,0xC6,0xA1,0x86,0x8E};
uchar display_data[8]={0,0,0,0,0,0,0,0};

uchar time[]={0,0,0};

void delay(void)
{
uchar i;
for(i=250;i>0;i--);
}

void display()
{
uchar i,k;
k=0x80;
for(i=0;i<8;i++)
{
P2=0;
P0=display_code[display_data[i]];
P2=k;
k=k>>1;
delay();
}
P2=0;
}

void calc()
{
time[0]++;
if(time[0]>23)
time[0]=0;
}

void convert()
{
display_data[0]=time[0]/10;
display_data[1]=time[0]%10;
}

void main(void)
{
uchar i;
while(1)
{
for(i=0;i<250;i++)
{
display();
}
calc();
convert();
}
}