DIY LED digital tube timer

Since there is only one digital tube, it can only display 0 to 15, so this timer can be used for 0 to 15 minutes, 0 to 15 hours, 0 to 15 days, and 0 to 15 weeks. I originally wanted to add a timer for 0 to 15 months in the program, but I thought that in actual situations, the 15-month timer has been more than a year, and it is estimated that it will be rarely used, so I will not write it. I added a relay to this timer, so it can control 220V AC, and the timing error is within a few milliseconds, which is quite accurate. . .

Here are a few early schematic diagrams:         Here is the source code of the microcontroller: #include #define uint unsigned int #define uchar unsigned char sbit ledg=P1^0;//second flashing (one second on and one second off) sbit ledb=P1^1;//minute flashing (one minute on and one minute off) sbit fmq=P3^3;//buzzer sbit ledx=P3^4;//timer week indicator sbit ledt=P3^6;//timer day indicator sbit ledf=P3^5;//timer minute indicator sbit leds=P3^7;//timer hour indicator sbit key1=P1^6;//start|pause sbit key2=P1^5;//adjust timer minutes sbit key3=P1^4;//adjust timer hours sbit key4=P1^3;//adjust timer day sbit key5=P1^2;// adjust the timing week sbit jdq=P1^7; //relay uint i,j,num,num1,num2,num3,num4,num5,num6; uchar shi,temp1,temp2,temp3,temp4,temp5,temp6,temp7,temp8,dsf,dss,dst,dsx; uchar code shuju[]={0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8, 0x80,0x90,0x88,0x83,0xC6,0xA1,0x86,0x8E                           }; void delayms(uint xms) { for(i=xms;i>0;i--) for(j=110;j>0;j--); } void display(shi) { P2=shuju[shi]; } void keyscan() { uchar i; if(key1==0) {     delayms(10); if(key1==0) { ledb=0; //Call the minute flashing indicator to indicate start|pausewhile (i==0&&P2!=0xC0) {    TR0=~TR0;// Start|Pausei  ++; } if(TR0==1) {        ledb=1;//Call the minute flashing indicator to indicate start|pause } else   {      TR0=0;    } } }   if(key2==0&&TR0==0)     {     dss=0; // Timer hour clears dst=0; // Timer day clears dsx=0; // Timer week clears temp1=1; //Enter switch-case    delayms(10);                  }   if(key3==0&&TR0==0)     {    dsf=0; dst=0; dsx=0; temp2=1;    delayms(10);                  }   if(key4==0&&TR0==0)     { dsf=0; dss=0; dsx=0; temp3=1;    delayms(10);                  }   if(key5==0&&TR0==0)     {    dsf=0; dss=0; dst=0; temp4=1;    delayms(10);                  }                      switch (temp1) {   case 1:  if(key2==0)    {  leds=1; // Turn off the timer hour indicator  ledt=1; // Turn off the timer day indicator  ledx=1; // Turn off the timer week indicator        ledf=0; // Turn on the timer minute indicator  ledg=1; // Turn off the second flashing  ledb=1; // Turn off the minute flashing  jdq=0; // Turn off the relay                          dsf++; // Minute increment







































































































 shi=dsf; // Send points to display
   if(dsf==16)
  {
     shi=0;
     dsf=0;  
   }
     while(!key2);
 temp1=2;
 temp5=1;
 num2=dsf;
 temp6=2;
 temp7=2;
 temp8=2;
 }
break;
    }
switch (temp2)
 {
 case 1:
if(key3==0)
  {
     ledf=1;
 ledt=1;
 ledx=1;
 leds=0;
 jdq=0;
 ledg= 1;
     ledb=1;
 dss++;
 shi=dss;
   if(dss==16)
 {
  shi=0;
  dss=0;
 }
                                      while(!key3);
 temp2=2;
 temp6=1;
     num4=dss;           
 temp5=2 ;
 temp7=2;
 temp8=2;
}
break;
  }
  switch (temp3)
 {
 case 1:
if(key4==0)
  {
     ledf=1;
 leds=1;
 ledx=1;
 ledt=0;
 jdq=0;
 ledg=1;
     ledb=1;
 dst++;
 shi=dst;
  if(dst==16)
    {
  shi=0;
  dst=0;
}
                                     while(!key4);
temp3=2;
temp7=1;
    num5=dst;           
    temp5=2;
temp6=2;
temp8=2;
  }
 break;
}
 switch (temp4)
{
 case 1:
  if(key5==0)
  {
     ledf=1;
 leds=1;
 ledt=1;
 ledx=0;
 jdq=0;
 ledg=1;
     ledb=1;
 dsx++;
 shi=dsx;
  if(dsx==16)
    {
      shi=0;
  dsx=0 ;
}
                                     while(!key5);
temp4=2;
temp8=1;
    num6=dsx;           
    temp5=2;
temp6=2;
temp7=2;
  }
 break;
}
 switch (temp5)
{
  case 1:
  if(num==3686)
{
   num=0;
   ledg=~ledg;
   num1++;
}

                   if(num1==60)
            {
num1=0;
num2--;
shi=num2;
                           if(num2==0)
                 {
    jdq=1;
TR0=0;
                 }
             }   
   break;

}
  switch (temp6)
{
    case 1:
       if(num==3686)
  {
   num=0;
   ledg=~ledg;
   num1++;
  }
     
if(num1==60)
{
num1=0;
ledb=~ledb;
num3++;
    if( num3==60)
   {
       num3=0;
num4--;
                   shi=num4;                                 
}
    if(num4==0)
   {
    jdq=1;
    TR0=0;
   }
                 }
    break;
         }
switch (temp7)
 {
    case 1:
 if( num==3686)
{
   num=0;
   ledg=~ledg;
   num1++;
}
     
if(num1==60)
{
num1=0;
ledb=~ledb;
num3++;
    if(num3==1440)
   {
       num3=0;
num5 --;
                   shi=num5;                                 
}
    if(num5==0)
   {
    jdq=1;
    TR0=0;
   }
                 }
    break;
         }
switch (temp8)
 {
    case 1:
 if(num==3686)
{
   num=0;
   ledg=~ledg;
   num1++;
}
     
if(num1==60)
{
num1=0;
ledb =~ledb;
num3++;
    if(num3==10080)
   {
       num3=0;
num6--;
                   shi=num6;                                 
}
    if(num6==0)
   {
    jdq=1;
    TR0=0;
   }
                 }
    break;
          }
}
  
void main() 
{
   TMOD=0x02;
TH0=6;
TL0=6;
EA=1;
ET0=1;
jdq=0;
while(1)
{
         keyscan();
     display(shi);
 while(jdq==1&&P2== 0xC0)
     {
      fmq=0;
ledg=1;
ledb=1;
     }
}
}
void T0_time()interrupt 1
{
    num++;
}
    
Download the full code: http://www.51hei.com/f/ledccr.rar
This is the circuit diagram drawn by the perforated board drawing software: