electronic lock or digital lock

[A.RAJASHEKAR]

//Program to make a code lock with user defined password



#include<reg51.h>

#define port P1

#define dataport P2

#define key P0

#define sec 100

sbit rs = port^0;

sbit rw = port^1;

sbit en = port^2;



sbit col1=key^4;

sbit col2=key^5;

sbit col3=key^6;

sbit row1=key^0;

sbit row2=key^1;

sbit row3=key^2;

sbit row4=key^3;

sbit lock_output=P0^7;



int check=0;

int digit[4]={0,0,0,0};

int dig_input[4]={0,0,0,0};

int dig_input_recheck[4]={0,0,0,0};



int i,k;





void delay(unsigned int msec) // Time delay function

{

int i,j ;

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

for(j=0;j<1275;j++);

}



void lcd_cmd(unsigned char item) // Function to send command to LCD

{

dataport = item;

rs= 0;

rw=0;

en=1;

delay(1);

en=0;

return;

}



void lcd_data(unsigned char item) // Function to send data to LCD

{

dataport = item;

rs= 1;

rw=0;

en=1;

delay(1);

en=0;

return;

}



void lcd_data_string(unsigned char *str) // Function to send data to string

{

int i=0;

while(str!=’’)

{

lcd_data(str);

i++;

//delay(10);

}

return;

}



void lcd(unsigned char str[10])

{

lcd_cmd(0x38);

lcd_cmd(0x0e);

lcd_data_string(str);

}





void ans()

{

if(check>3)

{

lcd_cmd(0x01);

lcd_cmd(0x82);

lcd_data_string(” LOCK OPEN”);

lock_output=1;

delay(300);

while(1);

}

else

{

lcd_cmd(0x01);

lcd_cmd(0x82);

lcd_data_string(” WRONG PASSWORD”);

lock_output=0;

delay(300);

}

}



void code_check() // Function to check password

{

if(i< )

{

switch((i+1))

{

case 1: {

if(dig_input[0]==digit[0])

{

check=check+1;

}

break;

}

case 2: {

if(dig_input[1]==digit[1])

{

check=check+1;

}

break;

}

case 3: {

if(dig_input[2]==digit[2])

{

check=check+1;

}

break;

}

case 4: {

if(dig_input[3]==digit[3])

{

check=check+1;

}

break;

}

}

}

delay(10);

if(i=)

{

ans();

}

}



void display(int a) //Display function

{

switch(a)

{

case 1:{

lcd_data(‘*’);

delay(100);

digit=1;

code_check();

break;

}

case 2:{

lcd_data(‘*’);

delay(100);

digit=2;

code_check();

break;

}

case 3:{

lcd_data(‘*’);

delay(100);

digit;

code_check();

break;

}

case 4:{

lcd_data(‘*’);

delay(100);

digit=4;

code_check();

break;

}

case 5:{

lcd_data(‘*’);

delay(100);

digit=5;

code_check();

break;

}

case 6:{

lcd_data(‘*’);

delay(100);

digit=6;

code_check();

break;

}

case 7:{

lcd_data(‘*’);

delay(100);

digit=7;

code_check();

break;

}

case 8:{

lcd_data(‘*’);

delay(100);

digit=8;

code_check();

break;

}

case 9:{

lcd_data(‘*’);

delay(100);

digit=9;

code_check();

break;

}

case 0:{

lcd_data(‘*’);

delay(100);

digit=0;

code_check();

break;

}

}

}



void check_col1()

{

row1=row2=row3=row4=1;

row1=0;

if(col1==0)

display(1);

row1=1;

row2=0;

if(col1==0)

display(4);

row2=1;

row3=0;

if(col1==0)

display(7);

row3=1;

row4=0;

if(col1==0)

{

row4=1;

}

}



void check_col2()

{

row1=row2=row3=row4=1;

row1=0;

if(col2==0)

display(2);

row1=1;

row2=0;

if(col2==0)

display(5);

row2=1;

row3=0;

if(col2==0)

display(;

row3=1;

row4=0;

if(col2==0)

display(0);

row4=1;

}



void check_col3()

{

row1=row2=row3=row4=1;

row1=0;

if(col3==0)

display(3);

row1=1;

row2=0;

if(col3==0)

display(6);

row2=1;

row3=0;

if(col3==0)

display(9);

row3=1;

row4=0;

if(col3==0)

{

row4=1;

}

}





void check_password_col1()

{

row1=row2=row3=row4=1;

row1=0;

if(col1==0)

dig_input[k]=1;

row1=1;

row2=0;

if(col1==0)

dig_input[k]=4;

row2=1;

row3=0;

if(col1==0)

dig_input[k]=7;

row3=1;

row4=0;

if(col1==0)

{

row4=1;

}

}



void check_password_col2()

{

row1=row2=row3=row4=1;

row1=0;

if(col2==0)

dig_input[k]=2;

row1=1;

row2=0;

if(col2==0)

dig_input[k]=5;

row2=1;

row3=0;

if(col2==0)

dig_input[k]=8;

row3=1;

row4=0;

if(col2==0)

{

dig_input[k]=0;

row4=1;

}

}





void check_password_col3()

{

row1=row2=row3=row4=1;

row1=0;

if(col3==0)

dig_input[k];

row1=1;

row2=0;

if(col3==0)

dig_input[k]=6;

row2=1;

row3=0;

if(col3==0)

dig_input[k]=9;

row3=1;

row4=0;

if(col3==0)

{

row4=1;

}

}



void pass_set()

{

row1=row2=row3=row4=0;

while(col1==1 && col2==1 && col3==1);

for(i=0;i<4;i++)

{

k=i;

delay(50);

lcd_cmd(0xc4+i);

delay(100);

row1=row2=row3=row4=0;

while(col1==1 && col2==1 && col3==1);

row1=row2=row3=row4=0;

if(col1==0)

check_password_col1();

else

if(col2==0)

check_password_col2();

else

if(col3==0)

check_password_col3();

lcd_data(‘*’);

delay(50);

}

}



void main()

{

int e,j=0,count=1;

col1=col2=col3=1;

//FOR PASSWoRD INPUT

do

{

lcd_cmd(0x01);  //Clear LCD screen

lcd_cmd(0x81);

  lcd(“ENTER PASSWORD:”);

  pass_set();

  for(e=0;e<4;e++)

  dig_input_recheck[e]=dig_input[e];

  lcd_cmd(0x01);

  lcd(“CONFIRM PASSWORD:”);

  pass_set();

  for(e=0;e<4;e++)

  {

   if(dig_input_recheck[e]==dig_input[e])

   j++;

  }

  if(j<4)

  {

   lcd_cmd(0x01);

   lcd_cmd(0x85);

   lcd(“PASSWORD”);

   lcd_cmd(0xC2);

   lcd(“NOT MATCH”);

   delay(300);

  }

}

while(j<4);

    

while(count<4)	//Code input and check

{

  lcd_cmd(0x01); 

  lock_output=0;

  lcd_cmd(0x82);  

  lcd(“ENTER PASSWORD”);

  check=0;

  row1=row2=row3=row4=0;

  while(col1==1 && col2==1 && col3==1);

  for(i=0;i<4;i++)

  {

   delay(100);

   lcd_cmd(0xc4+i);

   row1=row2=row3=row4=0;

   while(col1==1 && col2==1 && col3==1);

   row1=row2=row3=row4=0;

   if(col1==0)

   check_col1();

   else

    if(col2==0)

    check_col2();

    else

     if(col3==0)

     check_col3();

  }

  count++;

  delay(1);   

}



if(count==4)

{

  lcd_cmd(0x01);

  lcd_cmd(0x86);

  lcd(“SORRY”);

  lcd_cmd(0xc1);

  lcd(“NO MORE TRIALS”);

  while(1);

}

}

 

[Amrith]

Hello,

Better share your schematics & description. It will help others to understand your project.

[Lui Yat Ming]

Hi, Amrith

I have some question to  consult you on your paper ‘ how to interface computer’s…….’

Please see the Forum that I sent few question to ask help!

Thanks

 

[AJISH ALFRED]

Hi Rajashekar,

Without even a hint about the hardware specification, no one can make use of a C code.

Please post the hardware details also.

[Author]

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