CODES

 

Experiment No.1

LED FLASHING

 

#include<reg51.h>

#define Del 3000

sfr LED_PORT2=0xA0;       

 

void delay(unsigned int x)           

{

     unsigned int i,j;

     for(i=0;i<=x;i++)    

       for(j=0;j<=100;j++);    

               

}

 

void main(void)

{

     while(1)                  

           {

                LED_PORT2=0xff;           

                delay(Del);

                LED_PORT2=0x00;      

                delay(Del);

           }

}

 

Experiment No.1

//BCD Counter on PORT 1

BCD COUNTER

#include<reg51.h>

#define Del 2000

void delay(unsigned int x)            // delay function

{

     unsigned int i,j;

     for(i=0;i<x;i++)

                for(j=0;j<=100;j++); 

}

void main(void)

{

unsigned char count[10]={0xff,0xfe,0xfd,0xfc,0xfb,0xfa,0xf9,0xf8,0xf7,0xf6};

unsigned int x;

     P1=0x00;       

     while(1)  

           {

                for(x=0;x<10;x++)

                     {

                           P1=count[x];

                           delay(Del);

                     }

           }

}

 

 

Experiment No.1

Binary Counter

#include<reg51.h>

#define Del 2000

 

 

void delay(unsigned int x)            // delay function

{

     unsigned int i,j;

     for(i=0;i<x;i++)

                for(j=0;j<=100;j++); 

}

 

void main(void)

{

unsigned char count[16]={0xff,0xfe,0xfd,0xfc,0xfb,0xfa,0xf9,0xf8,0xf7,0xf6,0xf5,0xf4,0xf3,0xf2,0xf1,0xf0};

    

unsigned int x;

    

     P1=0x00;        // Make P1 as output port

    

     while(1)   // do it continuosly

           {

                for(x=0;x<10;x++)

                     {

                           P1=count[x];

                           delay(Del);

                     }

           }

}

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Experiment No.2

Seven Segment Display

 

#include<reg51.h>

#define del 500

 

void delay(unsigned int x)           

{

     unsigned int i,j;

     for(i=0;i<x;i++)

          for(j=0;j<=100;j++); 

}

 

void main(void)

{

while(1)                    

          

{

     P2=0xEB;

     P3=0x7F;

     delay(del);          

 

     P2=0x4C;

     P3=0xBF;

     delay(del);          

     P2=0x49;

     P3=0xDF;

     delay(del);          

     P2=0x2B;

     P3=0xEF;

     delay(del);          

     }

}

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Experiment No.3

 

//Squarewave using DAC with timer delay

#include <reg51.h>

void delay();

 

 

void main()

{

while(1)

{

     P2=0x00;

     delay();

     P2=0xFF;

     delay();

}

}

 

void delay()      //20ms delay

{

TMOD=0x01; // timer 0 ,mode 1(16 bit)

TL0=0x3E;// load TL0

TH0=0xB8;

TR0=1;

while(TF0==0);// wait for TF0 to roll over

TR0=0;

TF0=0;

}

 

 

// Triangular waveform generation

#include< reg51.h>

 

unsigned char d;

void main(void)

{

while(1)

    {

for(d=0; d<255; d++)

        {            P2 = d;

        }

for(d=255; d>0; d--)

        {

            P2 = d;

        }

    }

}

 

 

 

 

Experiment No.4

//Stepper motor Anticlockwise

#include <reg51.h>

void delay(unsigned char del);

void main()

{

     while(1)

     {

     P0=0x0a;

     delay(10);

     P0=0x09;

     delay(10);

     P0=0x05;

     delay(10);

     P0=0x06;

     delay(10);

    

     }

}

void delay(unsigned char del)

{

     unsigned int i,j;

     for(i=0;i<1275;i++)

      for(j=0;j<del;j++); 

}

 

Experiment No.4

//Stepper motor Clockwise

#include <reg51.h>

void delay(unsigned char del);

void main()

{

     while(1)

     {

     P0=0x06;

     delay(10);

     P0=0x05;

     delay(10);

     P0=0x09;

     delay(10);

     P0=0x0a;

     delay(10);

    

     }

}

void delay(unsigned char del)

{

     unsigned int i,j;

     for(i=0;i<1275;i++)

      for(j=0;j<del;j++);

}

 

Experiment No.5

 

RAM-RAM

 

           ORG 0000H

    

           MOV R0, #20H

           MOV R1, #40H

           MOV R2, #05H

 

BACK: MOV A, @R0

           MOV @R1, A

           INC R0

           INC R1

           DJNZ R2, BACK

           END

          

 

RAM-EX

     ORG 0000H

    

           MOV R0, #20H

           MOV DPTR, #040H

           MOV R2, #05H

 

BACK: MOV A, @R0

           MOVX @DPTR, A

           INC R0

           INC DPTR

           DJNZ R2, BACK

           END

 

ROM-RAM

 

     ORG 0000H

    

           MOV R0, #20H

           MOV R1, #05H

           MOV DPTR, #0234H

          

BACK: CLR A

           MOVC A, @A+DPTR

           MOV @R0, A

           INC R0

           INC DPTR

           DJNZ R1, BACK

          

           ORG 0234H

           DB 2H, 4H, 6H, 8H, 10H

           END

 

 

Exp 6 :

Led buzzer relay interfacing

#include <stdio.h>

#include <stdlib.h>

#include<PIC18F4550.h>

void delay()

{

    unsigned int j;

for(j=0; j<30000; j++)

  {

    }

}

void main()

 

{

   unsigned int key, i;

key=0;

 TRISB=0x00;

 TRISDbits.RD2=0;

 TRISAbits.RA4=0; 

 TRISDbits.RD0=1;

 TRISDbits.RD1=1;

   while(1)

  {   

if(PORTDbits.RD0==0)    

 {

key=0;

    }

     if(PORTDbits.RD1==0)

  {

            key=1;

        }

        if(key==0)

        {

            LATDbits.LATD2=0;

            LATAbits.LATA4=0;

            for(i=0;i<8;i++)

            {

                LATB=0x01<<i;

                delay();

            }

        }

        if(key==1)

        {

            LATDbits.LATD2=1;

            LATAbits.LATA4=1;

            for(i=0;i<8;i++)

            {

                LATB=0x80>>i;

                delay();

            }

        }

    }

 

Exp 7 

LCD 8 bit

#include <stdio.h>

#include <stdlib.h>

#include<pic18f4550.h>

#define RS LATCbits.LATC0

#define E LATCbits.LATC1

#define LCDPORT LATB

void delay()

{

    for(int i=0; i<30000; i++)

    {

    }

}

void sendCommand(unsigned char command)

{

    LCDPORT=command;

    RS=0;

    delay();

    E=1;

    delay();

    E=0;

    delay();

}

void sendData(unsigned char data)

{

    LCDPORT=data;

    RS=1;

    delay();

    E=1;

    delay();

    E=0;

    delay();

}

void main()

{

    TRISB=0x00;

    TRISCbits.RC0=0;

    TRISCbits.RC1=0;

    sendCommand(0x38);

    sendCommand(0x01);

    sendCommand(0x0F);

    sendCommand(0x06);

    sendCommand(0x80);

    sendData('E');

    sendData('&');

    sendData('T');

    sendData('C');

    sendData(' ');

    sendData('S');

    sendData('C');

    sendData('O');

    sendData('E');

    sendCommand(0xC0);

    sendData('P');

    sendData('U');

    sendData('N');

    sendData('E');

    sendData('-');

    sendData('4');

    sendData('1');

}

 

LCD wit Keypad

#include <stdio.h>

#include <stdlib.h>

#include<pic18f4550.h>

#define RS LATCbits.LATC0

#define E LATCbits.LATC1

#define LCDPORT LATB

#define R1 LATDbits.LATD0

#define R2 LATDbits.LATD1

#define R3 LATDbits.LATD2

#define R4 LATDbits.LATD3

#define C1 PORTDbits.RD4

#define C2 PORTDbits.RD5

#define C3 PORTDbits.RD6

#define C4 PORTDbits.RD7

void delay()

{

   for(int i=0; i<30000; i++)

   {   }

}

void sendCommand(unsigned char command)

{

LCDPORT=command;

RS=0;

delay(); 

 E=1;   

 delay();   

 E=0;    

delay();

}

void sendData(unsigned char data)

{  

  LCDPORT=data;    

RS=1;   

 delay();  

  E=1;   

 delay();  

  E=0;   

 delay();

}

unsigned char keypad_read(void)

{

R1 = 0; 

R2 = 1; 

R3 = 1; 

R4 = 1; 

delay();       

if (C1 == 0) return '1';             

if (C2 == 0) return '2';                     

if (C3 == 0) return '3';                     

if (C4 == 0) return 'A';                     

R1 = 1;                

R2 = 0; 

R3 = 1; 

R4 = 1; 

delay();       

if (C1 == 0) return '4';     

if (C2 == 0) return '5';     

if (C3 == 0) return '6';

if (C4 == 0) return 'B';

R1 = 1;        

R2 = 1;

R3 = 0;

R4 = 1;

        delay();

if (C1 == 0) return '7';

if (C2 == 0) return '8';             

if (C3 == 0) return '9';             

if (C4 == 0) return 'C';             

        R1 = 1;       

R2 = 1;

        R3 = 1

        R4 = 0;

delay();

if (C1 == 0) return '0';             

if (C2 == 0) return 'D';             

if (C3 == 0) return 'E';             

if (C4 == 0) return 'F';             

return 0xFF;                          

}

unsigned char keypad_wait()

{ 

unsigned char key_press = 0xFF       

do       

{       

        key_press = keypad_read();

        }

        while (key_press == 0xFF);

       while (keypad_read() != 0xFF);

        return key_press;

}

void main()

{

TRISB=0x00;

TRISD=0xF0;   

TRISCbits.RC0=0;

TRISCbits.RC1=0;

unsigned char key_get;

sendCommand(0x38); 

sendCommand(0x01);  

sendCommand(0x0F); 

sendCommand(0x06);

sendCommand(0x80);

  while(1)

  {  

   key_get = keypad_wait();

     sendData(key_get);

   }

}

 

Timer interupt

#include<p18f4550.h>

void timerInit(void)

{

    T0CON = 0b00000111;      

    TMR0H = 0xED;

    TMR0L = 0xB0;

}

void Interrupt_Init(void)

{

    IPEN = 1;

    INTCON = 0b11100000;     

    TMR0IP = 0;

}

void interrupt low_priority timerinterrupt(void)

{

    if(TMR0IF == 1)          

    {

      TMR0ON = 0;            

      TMR0IF = 0;            

      LATB =~LATB;           

      TMR0H = 0xED;          

      TMR0L = 0xB0;

      TMR0ON = 1;                           

    }

}

void main(void)

{

   TRISB = 0x00;

   LATB = 0xFF;

   Interrupt_Init();

   timerInit();

   TMR0ON = 1;                            

   while(1);                              

}

 

UART

 

#include<p18F4550.h>

#include<stdio.h>

void InitUART()

{

  TRISCbits.RC6 = 0;

  TRISCbits.RC7 = 1;                        

  SPBRG = 77;

  TXSTA = 0b00100000;                       

  RCSTA = 0b10010000;

}

void SendChar(unsigned char data)

{

    while(TXIF == 0);             

    TXREG = data;                 

}

unsigned char GetChar(void)

{

    while(!RCIF);                 

    return RCREG;                 

}

void main(void)

{

    unsigned char key;

    InitUART();

    while(1)

    {

        key=GetChar();

        SendChar(key);

    }

}

 

 

ADC

#include<stdio.h>

#include <p18f4550.h>

#define RS LATCbits.LATC0

#define E LATCbits.LATC1

#define LCDPORT LATB

void delay()

{

    unsigned int i;

    for(i=0;i<30000;i++)

    {

    }

}

void sendCommand(unsigned char command)

{

    LCDPORT=command;

    delay();

    RS=0;

    delay();

    E=1;

    delay();

    E=0;

    delay();

}

void sendData(unsigned char data)

{

    LCDPORT=data;

    delay();

    RS=1;

    delay();

    E=1;

    delay();

    E=0;

    delay();

}

void InitLCD(void)

{

    sendCommand(0x38);

    sendCommand(0x01);

    sendCommand(0x0F);

    sendCommand(0x06);

}

void ADCInit()

{

    TRISEbits.RE2 = 1;  

        ADCON0 = 0b00011101;  

    ADCON1 = 0b00000111;

    ADCON2 = 0b10101110;

}

unsigned short Read_ADC()

{ 

    GODONE = 1;         

    while(GODONE == 1 );

    return ADRES;       

}

void DisplayResult(unsigned short ADCVal)

{

    unsigned char i,text[16];

    unsigned short tempv;

    tempv = ADCVal;

    ADCVal = (5500/1024)*tempv;            

    sprintf(text,"%04dmv",ADCVal);         

    sendCommand(0x80);

    for(i=0;i<6;i++)                       

    {

       sendData(text[i]);

    }

    sendCommand(0xC0);                     

    for(i=0;i<10;i++)

    {

        if(tempv & 0x200)

        {

            sendData('1');

        }

        else

        {

            sendData('0');

        }

        tempv=tempv<<1;

    }

}

void main()

{

    unsigned short Ch_result;

    TRISB = 0x00; 

    TRISCbits.RC0 = 0;

    TRISCbits.RC1 = 0;

    ADCInit();

    InitLCD();   

    while(1)

    {        

        Ch_result = Read_ADC();

        DisplayResult(Ch_result);

        delay();

        delay();

    }

}