how to edit this program if u want to change the default password..

[arjea2490]

---

we we're assigned to edit this program if how to change the default password and save a new password through the 4x3 keypad? please help us guys..and thanks..

[arjea2490]

we we're assigned to edit this program if how to change the default password and save a new password through the hex keypad and not the use of ICSP? please help us guys..and thanks..

this is the program we use MPLAB IDE..

//================================================== ======================================
// include
//================================================== =======================================
#include <pic.h>

//================================================== =======================================
// configuration
//================================================== =======================================
__CONFIG ( 0x3F32 );

//================================================== ========================================
// define
//================================================== ========================================
#define rs RC0
#define e RC1
#define led_red RC3
#define led_yellow RC2
#define lcd_data PORTD
#define relay RB1
#define buzzer RB2

//================================================== =========================================
// function prototype
//================================================== =========================================
void delay(unsigned long data);
void send_config(unsigned char data);
void send_char(unsigned char data);
void e_pulse(void);
void lcd_goto(unsigned char data);
void lcd_clr(void);
void send_string(const char *s);
void clearrow1(void);
void clearrow2(void);
void clearrow3(void);
void clearrow4(void);
void scancolumn1(void);
void scancolumn2(void);
void scancolumn3(void);
void beep_once(void);
void beep_twice(void);

//================================================== ==========================================
// global variable
//================================================== ==========================================
unsigned char password_count=0;
unsigned char keyin_char[6]; // Declare an array to stall the 6-digit key in password
unsigned char stalled_char[6]="123456"; // Declare an array to stall the 6-digit desired password

//================================================== ==========================================
// main function
//================================================== ==========================================
void main(void)
{
ADCON1=0b00000110; //set all portA pins as digital I/O
TRISA=0b11001111; //clear bit 4&5 portA as output and set the rest as input
TRISB=0b00000000; //set portB as output
TRISD=0b00000000; //set portD as output
TRISC=0b11110000; //set bit4-7 portC as input(connected to 4 row of keypad)
TRISE=0b00000000; //set portE as output

PORTC=0;
PORTD=0;
relay=0;
buzzer=0;
led_yellow=0;
led_red=0;

send_config(0b00001001); //clear display at lcd
send_config(0b00000010); //Lcd Return to home
send_config(0b00000110); //entry mode-cursor increase 1
send_config(0b00001100); //diplay on, cursor off and cursor blink off
send_config(0b00111000); //function

lcd_clr(); //clear LCD
delay(1000); //delay
lcd_goto(0); //initial display
send_string("PLEASE ENTER"); //Display "PLEASE ENTER" on lcd
lcd_goto(20); //Display on 2nd line
send_string("6-DIGIT PASSWORD"); //Display "6-DIGIT PASSWORD" on lcd


while(1)
{ //keypad scanning algorithm
clearrow1(); //Clear 1st output pin and set the others
scancolumn1(); //scan column 1-3
clearrow2(); //Clear 2nd output pin and set the others
scancolumn2(); //scan column
clearrow3(); //Clear 3rd output pin and set the others
scancolumn3(); //scan column
clearrow4(); //Clear 4th output pin and set the others


if(password_count==6)
{
password_count=0;
if((keyin_char[0]==stalled_char[0])&&(keyin_char[1]==stalled_char[1])&&
(keyin_char[2]==stalled_char[2])&&(keyin_char[3]==stalled_char[3])&&
(keyin_char[4]==stalled_char[4])&&(keyin_char[5]==stalled_char[5])) //compare the keyin value with stalled value to test whether password is correct
{
lcd_clr(); //clear lcd
lcd_goto(0);
send_string("SUCCESS!"); //display SUCCESS
led_yellow=1; //yellow light on
relay=1; //relay on
beep_once(); //beep one time
while(1); //infinity loop
}
else
{
lcd_clr(); //clear lcd
lcd_goto(0);
send_string("ERROR!"); //display ERROR!
led_red=1; //red light on
beep_twice(); //beep two time
while(1); //infinity loop
}
}
}
}

//================================================== =====================================
// scanning functions
//================================================== =====================================
void clearrow1(void) //clear the 1st row and set the others
{
RE1=0; //RE1,RE0, and s RA5 are the output pins from PIC which connect to 4 pins of keypad
RE0=1;
RA5=1;
}

void clearrow2(void) //clear the 2nd row and set the others
{
RE1=1;
RE0=0;
RA5=1;
}

void clearrow3(void) //clear the 3rd row and set the others
{
RE1=1;
RE0=1;
RA5=0;
}

void clearrow4(void) //clear the 4th row and set the others
{
RE1=1;
RE0=1;
RA5=1;
}

void scancolumn1(void)
{
if(RA0==0) //if key '*' is being pressed
{
while(RA0==0)continue; //waiting the key to be released
if(password_count==0)lcd_clr(); //Clear the LCD if the key is the 1st password
lcd_goto(password_count); //The cursor of LCD points to the column equivalent to the value of password_count variable
send_char('*'); //Display the symbol '*' at LCD
keyin_char[password_count]='*'; //Stall the '*' value at the keyin_char array
password_count+=1; //increase the Password_count variable's value by 1 and the result stall back to the variable
}
else if(RA1==0) //if key '7' is being pressed
{
while(RA1==0)continue; //waiting the key to be released
if(password_count==0)lcd_clr(); //Clear the LCD if the key is the 1st password
lcd_goto(password_count); //The cursor of LCD points to the column equivalent to the value of password_count variable
send_char('*'); //Display the symbol '*' at LCD
keyin_char[password_count]='7'; //Stall the '7' value at the keyin_char array
password_count+=1; //increase the Password_count variable's value by 1 and the result stall back to the variable
}
else if(RA2==0) //if key '4' is being pressed
{
while(RA2==0)continue; //waiting the key to be released
if(password_count==0)lcd_clr(); //Clear the LCD if the key is the 1st password
lcd_goto(password_count); //The cursor of LCD points to the column equivalent to the value of password_count variable
send_char('*'); //Display the symbol '*' at LCD
keyin_char[password_count]='4'; //Stall the '4' value at the keyin_char array
password_count+=1; //increase the Password_count variable's value by 1 and the result stall back to the variable
}
else if(RA3==0) //if key '1' is being pressed
{
while(RA3==0)continue; //waiting the key to be released
if(password_count==0)lcd_clr(); //Clear the LCD if the key is the 1st password
lcd_goto(password_count); //The cursor of LCD points to the column equivalent to the value of password_count variable
send_char('*'); //Display the symbol '*' at LCD
keyin_char[password_count]='1'; //Stall the '1' value at the keyin_char array
password_count+=1; //increase the Password_count variable's value by 1 and the result stall back to the variable
}
}

void scancolumn2(void)
{
if(RA0==0) //if key '0' is being pressed
{
while(RA0==0)continue; //waiting the key to be released
if(password_count==0)lcd_clr(); //Clear the LCD if the key is the 1st password
lcd_goto(password_count); //The cursor of LCD points to the column equivalent to the value of password_count variable
send_char('*'); //Display the symbol '*' at LCD -+
keyin_char[password_count]='0'; //Stall the '0' value at the keyin_char array
password_count+=1; //increase the Password_count variable's value by 1 and the result stall back to the variable
}
else if(RA1==0) //if key '8' is being pressed
{
while(RA1==0)continue; //waiting the key to be released
if(password_count==0)lcd_clr(); //Clear the LCD if the key is the 1st password
lcd_goto(password_count); //The cursor of LCD points to the column equivalent to the value of password_count variable
send_char('*'); //Display the symbol '*' at LCD
keyin_char[password_count]='8'; //Stall the '8' value at the keyin_char array
password_count+=1; //increase the Password_count variable's value by 1 and the result stall back to the variable
}
else if(RA2==0) //if key '5' is being pressed
{
while(RA2==0)continue; //waiting the key to be released
if(password_count==0)lcd_clr(); //Clear the LCD if the key is the 1st password
lcd_goto(password_count); //The cursor of LCD points to the column equivalent to the value of password_count variable
send_char('*'); //Display the symbol '*' at LCD
keyin_char[password_count]='5'; //Stall the '5' value at the keyin_char array
password_count+=1; //increase the Password_count variable's value by 1 and the result stall back to the variable
}
else if(RA3==0) //if key '2' is being pressed
{
while(RA3==0)continue; //waiting the key to be released
if(password_count==0)lcd_clr(); //Clear the LCD if the key is the 1st password
lcd_goto(password_count); //The cursor of LCD points to the column equivalent to the value of password_count variable
send_char('*'); //Display the symbol '*' at LCD
keyin_char[password_count]='2'; //Stall the '2' value at the keyin_char array
password_count+=1; //increase the Password_count variable's value by 1 and the result stall back to the variable
}
}

void scancolumn3(void)
{
if(RA0==0) //if key '#' is being pressed
{
while(RA0==0)continue; //waiting the key to be released
if(password_count==0)lcd_clr(); //Clear the LCD if the key is the 1st password
lcd_goto(password_count); //The cursor of LCD points to the column equivalent to the value of password_count variable
send_char('*'); //Display the symbol '*' at LCD
keyin_char[password_count]='#'; //Stall the '#' value at the keyin_char array
password_count+=1; //increase the Password_count variable's value by 1 and the result stall back to the variable
}
else if(RA1==0) //if key '9' is being pressed
{
while(RA1==0)continue; //waiting the key to be released
if(password_count==0)lcd_clr(); //Clear the LCD if the key is the 1st password
lcd_goto(password_count); //The cursor of LCD points to the column equivalent to the value of password_count variable
send_char('*'); //Display the symbol '*' at LCD
keyin_char[password_count]='9'; //Stall the '9' value at the keyin_char array
password_count+=1; //increase the Password_count variable's value by 1 and the result stall back to the variable
}
else if(RA2==0) //if key '6' is being pressed
{
while(RA2==0)continue; //waiting the key to be released
if(password_count==0)lcd_clr(); //Clear the LCD if the key is the 1st password
lcd_goto(password_count); //The cursor of LCD points to the column equivalent to the value of password_count variable
send_char('*'); //Display the symbol '*' at LCD
keyin_char[password_count]='6'; //Stall the '6' value at the keyin_char array
password_count+=1; //increase the Password_count variable's value by 1 and the result stall back to the variable
}
else if(RA3==0) //if key '3' is being pressed
{
while(RA3==0)continue; //waiting the key to be released
if(password_count==0)lcd_clr(); //Clear the LCD if the key is the 1st password
lcd_goto(password_count); //The cursor of LCD points to the column equivalent to the value of password_count variable
send_char('*'); //Display the symbol '*' at LCD
keyin_char[password_count]='3'; //Stall the '3' value at the keyin_char array
password_count+=1; //increase the Password_count variable's value by 1 and the result stall back to the variable
}
}


//================================================== =============================================
// General Purpose functions
//================================================== =============================================
void delay(unsigned long data)
{
for( ;data>0;data-=1);
}

void beep_once(void)
{
buzzer=1; //buzzer on
delay(8000);
buzzer=0; //buzzer off
}

void beep_twice(void)
{
buzzer=1; //buzzer on
delay(8000);
buzzer=0; //buzzer off
delay(13000);
buzzer=1; //buzzer on
delay(8000);
buzzer=0; //buzzer off
}

//================================================== ======================================
// LCD functions
//================================================== ======================================
void send_config(unsigned char data)
{
rs=0; //clear rs into config mode
lcd_data=data;
delay(50);
e_pulse();
}

void send_char(unsigned char data)
{
rs=1; //set rs into write mode
lcd_data=data;
delay(50);
e_pulse();
}

void e_pulse(void)
{
e=1;
delay(50);
e=0;
delay(50);
}

void lcd_goto(unsigned char data)
{
if(data<16)
{
send_config(0x80+data);
}
else
{
data=data-20;
send_config(0xc0+data);
}
}

void lcd_clr(void)
{
send_config(0x01);
delay(50);
}

void send_string(const char *s)
{
unsigned char i=0;
while (s && *s)send_char (*s++);

}

[DAVID.DJV]

hahaha mao mani akong kalabdan sa ulo sauna! PROGRAMMING!! hahah man ko ana kay gi hagbung kong Pena!!

[crysyani]

pag buhat nalang ug imong bag.o

kapoy kapoy lang ka ani!

pa balhin ni sa programming section oi!

[arjea2490]

mm...FYI...mo run na nga program using MPLAB IDE..it just that..pun-anan lang jud atong unsaun pag change the default password and save it...

[neigyl_noval]

Let the Computer Engineers do the coding.

[kamahak]

Mga taw sa istorya wala kailag [code] tags. Labad kau tan-awn ang imo code brader. Di mada.

[Tin_Tin]

Isulod pud na ug code tags brad, nya please paki post pud apil sa schematic ninyo.

[arjea2490]

this is the source code...

http://www.cytron.com.my/usr_attachm..._Schematic.pdf

//=======================================================================================
//    Project description    :PIC18F877A + 4x3 keypad + LCD are used to build a keypad door 
//                         security system which will activate the relay and buzzer after 
//                         a preset 6-digit password is entered.   
//                         LCD will display ****** when keypad is pressed. 
//                         preset password for this program is 123456 
//========================================================================================


//========================================================================================
//    include
//=========================================================================================
#include <pic.h> 

//=========================================================================================
//    configuration
//=========================================================================================
__CONFIG ( 0x3F32 );

//==========================================================================================
//    define
//==========================================================================================
#define    rs            RC0
#define    e            RC1
#define    led_red        RC3
#define led_yellow    RC2
#define    lcd_data    PORTD
#define relay        RB1
#define buzzer        RB2

//===========================================================================================
//    function prototype
//===========================================================================================
void delay(unsigned long data);
void send_config(unsigned char data);
void send_char(unsigned char data);
void e_pulse(void);
void lcd_goto(unsigned char data);
void lcd_clr(void);
void send_string(const char *s);
void clearrow1(void);
void clearrow2(void);
void clearrow3(void);
void clearrow4(void);
void scancolumn1(void);
void scancolumn2(void);
void scancolumn3(void);
void beep_once(void);
void beep_twice(void);

//============================================================================================
//    global variable
//============================================================================================
unsigned char password_count=0;
unsigned char keyin_char[6];                // Declare an array to stall the 6-digit key in password
unsigned char stalled_char[6]="123456";        // Declare an array to stall the 6-digit desired password

//============================================================================================
//    main function
//============================================================================================
void main(void)
{
    ADCON1=0b00000110;    //set all portA pins as digital I/O
    TRISA=0b11001111;    //clear bit 4&5 portA as output and set the rest as input 
    TRISB=0b00000000;    //set portB as output
    TRISD=0b00000000;    //set portD as output
    TRISC=0b11110000;    //set bit4-7 portC as input(connected to 4 row of keypad)
    TRISE=0b00000000;    //set portE as output

    PORTC=0;
    PORTD=0;
    relay=0;
    buzzer=0;
    led_yellow=0;
    led_red=0;

    send_config(0b00001001);    //clear display at lcd
    send_config(0b00000010);    //Lcd Return to home 
    send_config(0b00000110);    //entry mode-cursor increase 1
    send_config(0b00001100);    //diplay on, cursor off and cursor blink off
    send_config(0b00111000);    //function
    
    lcd_clr();                            //clear LCD
    delay(1000);                        //delay
    lcd_goto(0);                        //initial display
    send_string("PLEASE ENTER");        //Display "PLEASE ENTER" on lcd
    lcd_goto(20);                        //Display on 2nd line
    send_string("6-DIGIT PASSWORD");    //Display "6-DIGIT PASSWORD" on lcd

    
    while(1)
    {                                            //keypad scanning algorithm
            clearrow1();                        //Clear 1st output pin and set the others
            scancolumn1();                        //scan column 1-3
            clearrow2();                        //Clear 2nd output pin and set the others
            scancolumn2();                        //scan column
            clearrow3();                        //Clear 3rd output pin and set the others
            scancolumn3();                        //scan column
            clearrow4();                        //Clear 4th output pin and set the others
            
            
            if(password_count==6)    
            {
                password_count=0;
                if((keyin_char[0]==stalled_char[0])&&(keyin_char[1]==stalled_char[1])&&
                    (keyin_char[2]==stalled_char[2])&&(keyin_char[3]==stalled_char[3])&&
                    (keyin_char[4]==stalled_char[4])&&(keyin_char[5]==stalled_char[5]))    //compare the keyin value with stalled value to test whether password is correct
                {
                    lcd_clr();                        //clear lcd
                    lcd_goto(0);
                    send_string("SUCCESS!");        //display SUCCESS
                    led_yellow=1;                    //yellow light on
                    relay=1;                        //relay on
                    beep_once();                    //beep one time 
                    while(1);                        //infinity loop 
                }
                else
                {
                    lcd_clr();                        //clear lcd
                    lcd_goto(0);
                    send_string("ERROR!");            //display ERROR!
                    led_red=1;                        //red light on
                    beep_twice();                    //beep two time 
                    while(1);                        //infinity loop 
                }
            }
        }
}

//=======================================================================================
//    scanning functions
//=======================================================================================
void clearrow1(void)            //clear the 1st row and set the others
{
    RE1=0;                        //RE1,RE0, and s RA5 are the output pins from PIC which connect to 4 pins of keypad        
    RE0=1;
    RA5=1;                
}

void clearrow2(void)            //clear the 2nd row and set the others
{
    RE1=1;                                
    RE0=0;
    RA5=1;            
}

void clearrow3(void)            //clear the 3rd row and set the others
{
    RE1=1;                                
    RE0=1;
    RA5=0;                
}

void clearrow4(void)            //clear the 4th row and set the others
{
    RE1=1;                                
    RE0=1;
    RA5=1;            
}

void scancolumn1(void)
{
    if(RA0==0)                            //if key '*' is being pressed
    {
        while(RA0==0)continue;            //waiting the key to be released
        if(password_count==0)lcd_clr();    //Clear the LCD if the key is the 1st password
        lcd_goto(password_count);        //The cursor of LCD points to the column equivalent to the value of password_count variable
        send_char('*');                    //Display the symbol '*' at LCD    
        keyin_char[password_count]='*';    //Stall the '*' value at the keyin_char array
        password_count+=1;                //increase the Password_count variable's value by 1 and the result stall back to the variable    
    }
    else if(RA1==0)                            //if key '7' is being pressed
    {
        while(RA1==0)continue;            //waiting the key to be released
        if(password_count==0)lcd_clr();    //Clear the LCD if the key is the 1st password
        lcd_goto(password_count);        //The cursor of LCD points to the column equivalent to the value of password_count variable
        send_char('*');                    //Display the symbol '*' at LCD    
        keyin_char[password_count]='7';    //Stall the '7' value at the keyin_char array
        password_count+=1;                //increase the Password_count variable's value by 1 and the result stall back to the variable    
    }
    else if(RA2==0)                        //if key '4' is being pressed
    {
        while(RA2==0)continue;            //waiting the key to be released
        if(password_count==0)lcd_clr();    //Clear the LCD if the key is the 1st password
        lcd_goto(password_count);        //The cursor of LCD points to the column equivalent to the value of password_count variable
        send_char('*');                    //Display the symbol '*' at LCD    
        keyin_char[password_count]='4';    //Stall the '4' value at the keyin_char array
        password_count+=1;                //increase the Password_count variable's value by 1 and the result stall back to the variable    
    }
    else if(RA3==0)                        //if key '1' is being pressed
    {
        while(RA3==0)continue;            //waiting the key to be released
        if(password_count==0)lcd_clr();    //Clear the LCD if the key is the 1st password
        lcd_goto(password_count);        //The cursor of LCD points to the column equivalent to the value of password_count variable
        send_char('*');                    //Display the symbol '*' at LCD    
        keyin_char[password_count]='1';    //Stall the '1' value at the keyin_char array
        password_count+=1;                //increase the Password_count variable's value by 1 and the result stall back to the variable    
    }
 }

void scancolumn2(void)
{
    if(RA0==0)                            //if key '0' is being pressed
    {
        while(RA0==0)continue;            //waiting the key to be released
        if(password_count==0)lcd_clr();    //Clear the LCD if the key is the 1st password
        lcd_goto(password_count);        //The cursor of LCD points to the column equivalent to the value of password_count variable
        send_char('*');                    //Display the symbol '*' at LCD    -+
        keyin_char[password_count]='0';    //Stall the '0' value at the keyin_char array
        password_count+=1;                //increase the Password_count variable's value by 1 and the result stall back to the variable    
    }
    else if(RA1==0)                            //if key '8' is being pressed
    {
        while(RA1==0)continue;            //waiting the key to be released
        if(password_count==0)lcd_clr();    //Clear the LCD if the key is the 1st password
        lcd_goto(password_count);        //The cursor of LCD points to the column equivalent to the value of password_count variable
        send_char('*');                    //Display the symbol '*' at LCD    
        keyin_char[password_count]='8';    //Stall the '8' value at the keyin_char array
        password_count+=1;                //increase the Password_count variable's value by 1 and the result stall back to the variable    
    }
    else if(RA2==0)                        //if key '5' is being pressed
    {
        while(RA2==0)continue;            //waiting the key to be released
        if(password_count==0)lcd_clr();    //Clear the LCD if the key is the 1st password
        lcd_goto(password_count);        //The cursor of LCD points to the column equivalent to the value of password_count variable
        send_char('*');                    //Display the symbol '*' at LCD    
        keyin_char[password_count]='5';    //Stall the '5' value at the keyin_char array
        password_count+=1;                //increase the Password_count variable's value by 1 and the result stall back to the variable    
    }
    else if(RA3==0)                        //if key '2' is being pressed
    {
        while(RA3==0)continue;            //waiting the key to be released
        if(password_count==0)lcd_clr();    //Clear the LCD if the key is the 1st password
        lcd_goto(password_count);        //The cursor of LCD points to the column equivalent to the value of password_count variable
        send_char('*');                    //Display the symbol '*' at LCD    
        keyin_char[password_count]='2';    //Stall the '2' value at the keyin_char array
        password_count+=1;                //increase the Password_count variable's value by 1 and the result stall back to the variable    
    }
}

void scancolumn3(void)
{
    if(RA0==0)                        //if key '#' is being pressed
    {
        while(RA0==0)continue;            //waiting the key to be released
        if(password_count==0)lcd_clr();    //Clear the LCD if the key is the 1st password
        lcd_goto(password_count);        //The cursor of LCD points to the column equivalent to the value of password_count variable
        send_char('*');                    //Display the symbol '*' at LCD    
        keyin_char[password_count]='#';    //Stall the '#' value at the keyin_char array
        password_count+=1;                //increase the Password_count variable's value by 1 and the result stall back to the variable    
    }
    else if(RA1==0)                        //if key '9' is being pressed
    {
        while(RA1==0)continue;            //waiting the key to be released
        if(password_count==0)lcd_clr();    //Clear the LCD if the key is the 1st password
        lcd_goto(password_count);        //The cursor of LCD points to the column equivalent to the value of password_count variable
        send_char('*');                    //Display the symbol '*' at LCD    
        keyin_char[password_count]='9';    //Stall the '9' value at the keyin_char array
        password_count+=1;                //increase the Password_count variable's value by 1 and the result stall back to the variable    
    }
    else if(RA2==0)                        //if key '6' is being pressed
    {
        while(RA2==0)continue;            //waiting the key to be released
        if(password_count==0)lcd_clr();    //Clear the LCD if the key is the 1st password
        lcd_goto(password_count);        //The cursor of LCD points to the column equivalent to the value of password_count variable
        send_char('*');                    //Display the symbol '*' at LCD    
        keyin_char[password_count]='6';    //Stall the '6' value at the keyin_char array
        password_count+=1;                //increase the Password_count variable's value by 1 and the result stall back to the variable    
    }
    else if(RA3==0)                        //if key '3' is being pressed
    {
        while(RA3==0)continue;            //waiting the key to be released
        if(password_count==0)lcd_clr();    //Clear the LCD if the key is the 1st password
        lcd_goto(password_count);        //The cursor of LCD points to the column equivalent to the value of password_count variable
        send_char('*');                    //Display the symbol '*' at LCD    
        keyin_char[password_count]='3';    //Stall the '3' value at the keyin_char array
        password_count+=1;                //increase the Password_count variable's value by 1 and the result stall back to the variable    
    }
}


//===============================================================================================
//    General Purpose    functions
//===============================================================================================
void delay(unsigned long data)
{
    for( ;data>0;data-=1);
}

void beep_once(void)
{
    buzzer=1;                        //buzzer on
    delay(8000);
    buzzer=0;                        //buzzer off
}

void beep_twice(void)
{
    buzzer=1;                        //buzzer on
    delay(8000);
    buzzer=0;                        //buzzer off
    delay(13000);
    buzzer=1;                        //buzzer on
    delay(8000);
    buzzer=0;                        //buzzer off
}

//========================================================================================
//    LCD    functions
//========================================================================================
void send_config(unsigned char data)
{
    rs=0;                                //clear rs into config mode 
    lcd_data=data;
    delay(50);
    e_pulse();
}

void send_char(unsigned char data)
{
    rs=1;                                //set rs into write mode
    lcd_data=data;                         
    delay(50);
    e_pulse();
}

void e_pulse(void)
{
    e=1;
    delay(50);
    e=0;
    delay(50);
}

void lcd_goto(unsigned char data)
{
     if(data<16)
    {
         send_config(0x80+data);
    }
    else
    {
         data=data-20;
        send_config(0xc0+data);
    }
}

void lcd_clr(void)
{
     send_config(0x01);
    delay(50);    
}

void send_string(const char *s)
{          
    unsigned char i=0;
      while (s && *s)send_char (*s++);

} 

[arjea2490]

sorry i am a new user and we really need help...i attach the schematic for that code but we're using 4x3 keypad with MPLAB IDE software...