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- // SQUARE_WAVE_KEIL_8051
- #include <reg51.h>
- sbit pin = P1^0;
- main()
- {
- P1 = 0x00;
- TMOD = 0x09;
- loop:TL0 = 0xAF;
- TH0 = 0x3C;
- pin = 1;
- TR0 = 1;
- while(TF0 == 0) {}
- TL0 = 0xAF;
- TH0 = 0x3C;
- pin = 0;
- while(TF0 == 0) {}
- goto loop;
- }
- -------------------------------------------------------------------------------------------------------------------------
- // LED interfacing
- #include <reg51.h>
- sbit LED = P1^0;
- void delay(unsigned int y){
- unsigned int i, j;
- for(i = 0; i < y; i++) {
- for(j = 0; j < 1275; j++) {
- }
- }
- }
- void main(){
- while(1) {
- delay(100);
- LED = 0;
- delay(100);
- LED = 1;
- }
- }
- -------------------------------------------------------------------------------------------------------------------------
- // DC Motor interfacing
- #include<reg51.h>
- #include<stdio.h>
- void delay(void);
- sbit motor_pin_1 = P2^0;
- sbit motor_pin_2 = P2^1;
- void main()
- {
- do
- {
- \ motor_pin_1 = 1;
- motor_pin_2 = 0; //Rotates Motor Anit Clockwise
- delay();
- motor_pin_1 = 1;
- motor_pin_2 = 1; //Stops Motor
- delay();
- motor_pin_1 = 0;
- motor_pin_2 = 1; //Rotates Motor Clockwise
- delay();
- motor_pin_1 = 0;
- motor_pin_2 = 0; //Stops Motor
- delay();
- }while(1);
- }
- void delay()
- {
- int i,j;
- for(i=0;i<1000;i++){
- for(j=0;j<1000;j++){
- }
- }
- }
- -------------------------------------------------------------------------------------------------------------------------
- // LCD Interfacing
- #include<reg51.h>
- #define display_port P2
- sbit rs = P3^2;
- sbit rw = P3^3;
- sbit e = P3^4;
- void msdelay(unsigned int time)
- {
- unsigned i,j ;
- for(i=0;i<time;i++);
- for(j=0;j<1275;j++);
- }
- void lcd_cmd(unsigned char command)
- {
- display_port = command;
- rs= 0;
- rw=0;
- e=1;
- msdelay(1);
- e=0;
- }
- void lcd_data(unsigned char disp_data)
- {
- display_port = disp_data;
- rs= 1;
- rw=0;
- e=1;
- msdelay(1);
- e=0;
- }
- void lcd_init()
- {
- lcd_cmd(0x38);
- msdelay(10);
- lcd_cmd(0x0F);
- msdelay(10);
- lcd_cmd(0x01);
- msdelay(10);
- lcd_cmd(0x81);
- msdelay(10);
- }
- void main()
- {
- unsigned char a[8]="TESGING";
- int l=0;
- lcd_init();
- while(a[l] != '\0')
- {
- lcd_data(a[l]);
- l++;
- msdelay(50);
- }
- }
- -------------------------------------------------------------------------------------------------------------------------
- // Matrix Keyboard
- #include<reg51.h>
- #define display_port P2
- sbit rs = P3^2;
- sbit rw = P3^3;
- sbit e = P3^4;
- sbit C4 = P1^0;
- sbit C3 = P1^1;
- sbit C2 = P1^2;
- sbit C1 = P1^3;
- sbit R4 = P1^4;
- sbit R3 = P1^5;
- sbit R2 = P1^6;
- sbit R1 = P1^7;
- void msdelay(unsigned int time)
- {
- unsigned i,j ;
- for(i=0;i<time;i++)
- for(j=0;j<1275;j++);
- }
- void lcd_cmd(unsigned char command)
- {
- display_port = command;
- rs= 0;
- rw=0;
- e=1;
- msdelay(1);
- e=0;
- }
- void lcd_data(unsigned char disp_data)
- {
- display_port = disp_data;
- rs= 1;
- rw=0;
- e=1;
- msdelay(1);
- e=0;
- }
- void lcd_init()
- {
- lcd_cmd(0x38);
- msdelay(10);
- lcd_cmd(0x0F);
- msdelay(10);
- lcd_cmd(0x01);
- msdelay(10);
- lcd_cmd(0x81);
- msdelay(10);
- }
- void row_finder1()
- {
- R1=R2=R3=R4=1;
- C1=C2=C3=C4=0;
- if(R1==0)
- lcd_data('1');
- if(R2==0)
- lcd_data('4');
- if(R3==0)
- lcd_data('7');
- if(R4==0)
- lcd_data('*');
- }
- void row_finder2()
- {
- R1=R2=R3=R4=1;
- C1=C2=C3=C4=0;
- if(R1==0)
- lcd_data('2');
- if(R2==0)
- lcd_data('5');
- if(R3==0)
- lcd_data('8');
- if(R4==0)
- lcd_data('0');
- }
- void row_finder3() //Function for finding the row for column 3
- {
- R1=R2=R3=R4=1;
- C1=C2=C3=C4=0;
- if(R1==0)
- lcd_data('3');
- if(R2==0)
- lcd_data('6');
- if(R3==0)
- lcd_data('9');
- if(R4==0)
- lcd_data('#');
- }
- void row_finder4() //Function for finding the row for column 4
- {
- R1=R2=R3=R4=1;
- C1=C2=C3=C4=0;
- if(R1==0)
- lcd_data('A');
- if(R2==0)
- lcd_data('B');
- if(R3==0)
- lcd_data('C');
- if(R4==0)
- lcd_data('D');
- }
- void main()
- {
- lcd_init();
- while(1)
- {
- msdelay(30);
- C1=C2=C3=C4=1;
- R1=R2=R3=R4=0;
- if(C1==0)
- row_finder1();
- else if(C2==0)
- row_finder2();
- else if(C3==0)
- row_finder3();
- else if(C4==0)
- row_finder4();
- }
- }
- -------------------------------------------------------------------------------------------------------------------------
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