A simple digital tube clock based on 51 single chip microcomputer

Looking at the materials in the drawer, I wanted to make something for fun. I originally wanted to make a 99-meter meter, but there were not enough key switches, so I changed it to a clock. Without further ado, here are the pictures. The final simulation schematic diagram
of the minimum system

 



display module is as follows (the proteus simulation project file can be downloaded in the attachment of this post) The microcontroller source program is as follows:
 



 


 

/*********************************************************************************

*Experiment name: Digital tube dynamic display

*Experimental results: 8-bit digital tube displays the numbers 12345678

*Note: The delay time between each digital tube display is less than 3ms, and you can see 8 digital tubes light up at the same time

*

*********************************************************************************/

#include

#define uchar unsigned char

#define uint unsigned int

uint k=0;

uint second=0;//second

uint min = 0; // Minutes

uint hour=1;//hour

sbit we1=P3^3; //bit selection

sbit we2=P3^1;

sbit we3=P3^2;

sbit we4=P3^0;

sbit L0=P2^0;

uchar code sz[17]={0x3f , 0x06 , 0x5b ,0x4f , 0x66 , 0x6d ,0x7d ,

                   0x07 , 0x7f , 0x6f ,0x77 , 0x7c , 0x39 , 

                   0x5e , 0x79 , 0x71 , 0x00}; //0-9&A-F&“not displayed” font code

void delay(uint xms) //xms equals to the delay of a few milliseconds

{

    uint i,j;

        for(i=xms;i>0;i--)

            for(j=112;j>0;j--);

}

void Init_timer0(void)

{

  TMOD |= 0X01; //Working mode 1 Timing function controlled by internal register

        TH0=0X3c; //initial value of the upper eight bits

        TL0=0Xb0; //initial value of the eighth bit

        EA=1; // Enable overall interruption

        ET0=1; //Enable timer 0 interrupt

        TR0=1; //Start counting

}

void Timer0_isr(void)interrupt 1

{

  TH0=0x3c;

        TL0=0xb0;

        k++;

}

void main()

{

        Init_timer0();

    while(1)

        {

                if(k==20) //20 times 1 second

                {

                second++;

                k=0;

                if(second==60)

                {

                  second =0;

                        min++;

                        if(min==60)

                        {

                           min=0;

                                 hour++;

                                if(hour==13)

                                {

                                  hour=1;

                                }

                        }

                }

                }

                P1=sz[min%10]; //Minute display

                we4 =0;

                delay(5);

                we4=1;

                P1=sz[min/10];   

                of 3=0;

                delay(5);

                of 3=1;

                P1=sz[hour%10]; //Hour display

                we2=0;

                delay(5);

                we2=1;

                P1=sz[hour/10];   

                we1=0;

                delay(5);

                we1=1;

                /*P1=sz[0]; //display 0

                we1=0;

                delay(10);

                we1=1;

                P1=sz[1]; //display 1

                we2=0;

                delay(10);

                we2=1;

                P1=sz[2]; //display 2

                of 3=0;

                delay(10);

                of 3=1;

                P1=sz[3]; //display 3

                we4=0;

                delay(10);

                we4=1;*/

        }

}

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