An Example of LED Dynamic Display Based on 80C51 Single Chip Microcomputer

Fig. 1 wiring diagram of single chip microcomputer 80C51

control system design

Block diagram

Fig. 2 program block diagram

Program list

The program is written into 80C51 chip as follows

#include

/*---------------------Define variables----------------------------------*/

　　sbit p1_ 0=P1^0;

　　sbit p1_ 1=P1^1;

　　sbit p1_ 2=P1^2;

　　sbit p1_ 3=P1^3;

　　sbit p1_ 4=P1^4;

　　sbit p1_ 7=P1^7;

/ / common anode nixie tube displays segment codes of 0 9

　　unsigned char code table[]=0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90;

　　unsigned int count=0; // Define counter

　　unsigned int weight=0; // Weighing variable

　　void delay(unsigned int TIme); // delayed

　　void display(unsigned int n); // Nixie tube display

/ * ----------------- main program------------------------------------*/

　　void main(void)

/ * - input synchronous display-*/

　　while(1)

　　int i=0;

　　unsigned int a;

If ((P1 & 0x1f) = = 0x1f); / / no action without pressing the key

Else if (p1_0 = = 0) count = count 100; while (p1_0 = = 0); / / while (P1! = 0xff) is waiting for the key to be released

　　else if(p1_1==0) count=count10; while(p1_1==0);

　　else if(p1_2==0) count=count1; while(p1_2==0);

Else if (p1_3 = = 0) count = 0; while (p1_3 = = 0); / / calculate zero clearing

Else if (p1_4 = = 0) break; / / confirm to start weighing

　　p1_7=0;

If (count > 255) count = 0; / / the counter range is 0 255g, and will be cleared automatically

　　a=count;

Display (a); / / call the display function

　　

/ * - judge whether the weighing is sufficient and display-*/

　　while(1)

Weight = P3; / / obtain the weighing data from port P3

　　if(weight

Else p1_7 = 0; / / P1.7 set the low position to stop the motor

　　display(weight*5);

If (p1_3 = = 0) while (p1_3 = = 0); break; / / clear the calculation and end the weighing

　　

　　

/ * ----------------- delay subroutine -------------------------------------------- * / void delay (unsigned int time)

　　unsigned int j=0;

　　for(;TIme>0;TIme--)

　　for(j=0;j