RFID BASED TOLLPLAZA

[ghuran]

sir i have used microcontroller 8051 AT89C51 in my project .in my project there is a rfid tag which is need to be programmed using 8051 microcontroller .i have taken code from this site only,but it doesnot show any thing on the LCD.pls help me out where is the problem.

 

the code is :-

 #include<reg51.h>

#define port P1

#define key P0  // Port for keypad

 void memory();

 

 sfr lcd_data_pin=0xA0;

 sbit rs = P1^3;

 sbit rw = P1^4;

 sbit en = P1^5;

 

 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;

 unsigned int number=0,pointer=1;

 unsigned char card_mem[4][12];

 unsigned char card_id[12],index=0,key1=0,lcd,print=0,new_user=0,recharge=0,user_index,t,tool=0;

 unsigned int amount[4];

 unsigned char current_byte = 0,money[6];

 unsigned char pos=0,set=0;

 

void delay(unsigned char count) //Function to provide time delay

{

  unsigned int j;

unsigned char i;

  for(i=0;i<count;i++)

  for(j=0;j<1275;j++);

}

 

void lcd_command(unsigned char comm)   //LCD command funtion 

{

  lcd_data_pin=comm;

  en=1;

  rs=0;

  rw=0;

  delay(1);

  en=0;

}

 

void lcd_data(unsigned char disp)  //LCD data function 

{

  lcd_data_pin=disp;

  en=1;

  rs=1;

  rw=0;

  delay(1);

  en=0;

}

 

lcd_string(unsigned char *disp) //LCD string function 

{

  char x;

  for(x=0;disp[x]!=0;x++)

{

  lcd_data(disp[x]);

}

}

 

void lcd_ini()  //Function to initialize the LCD

{

lcd_command(0x38);   

delay(5);

lcd_command(0x0F);        

delay(5);

 

}

 

lcd_display(unsigned int val)

{

unsigned char flg=0;

lcd_command(0xCC);

if(val==0)

lcd_data(‘0’);

while(val>0)

{ 

lcd=val%10;

val=val/10;

lcd_command(0xCC-flg);

lcd_data(lcd+’0′);

flg++;

}

}

 

 

void recieve() interrupt 4 //Function to recieve data serialy from RS232 

{

card_id[current_byte]=SBUF;

RI=0; // Reset the serial interrupt after recieving the byte

current_byte++;

}

 

void display(unsigned char value)

{

lcd_command(0x80+pos);

if(value==10)

{

print=1; 

}

if(value==12)

{

set=1; 

}

if(value<=9)

{

lcd_data(‘0’+value);

money[pos]=value;

pos++;

}

}

 

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)

display(10);

row4=1;

}

 

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;

}

 

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)

display(12);

row4=1;

}

 

keypad()

{

row1=row2=row3=row4=0;

if(col1==0)

check_col1();

if(col2==0)

check_col2();

if(col3==0)

check_col3();

}

  

void show()

{

unsigned char count,i,key,val,flag=0,in;

unsigned int balance,j;

TMOD=0x00; //Enable Timer 1

TH1=0x00;

SCON=0x00;

TR1=0;

IE=0x00; 

lcd_command(0x01);

val=index;

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

{ 

key=0;

for(count=0;count<12;count++)

{ 

if(card_id[count]==card_mem[count])

{

key++;

}

}

if(key==12)

{

flag=1;

if(amount<=10)

{

user_index=i;

lcd_string(“Insuff. balance”);

lcd_command(0xC0);

lcd_string(“Pls recharge”);

delay(250);

lcd_command(0x01);

lcd_string(“To recharge”);

lcd_command(0xC0);

lcd_string(“press *”);

for(in=0;in<250;in++)

{

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

{

row1=row2=row3=row4=0;

if(col1==0)

{

tool=1;

recharge=1;

t=1;

keypad();

break;

}

}

if(t==1)

break;

}

lcd_command(0x01);

lcd_string(“Pls scan your ID”);

break;  

}

if(tool==0)

{

lcd_string(“Thank you User “);

lcd_command(0x8F);

lcd_data(49+i);

delay(250);

lcd_command(0x01);

lcd_string(“Charges 10.00”);

amount=amount-10;

lcd_command(0xC0);

lcd_string(“Amt left  “);

balance=amount;

lcd_display(balance);

lcd_command(0xCD);

lcd_string(“.00”);

delay(250);

lcd_command(0x01);

if(amount<=30)

{

user_index=i;

lcd_string(“Pls recharge”);

lcd_command(0xC0);

lcd_string(“your account”);

delay(250);

lcd_command(0x01);

lcd_string(“To recharge”);

lcd_command(0xC0);

lcd_string(“press *”);

for(in=0;in<250;in++)

{

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

{

row1=row2=row3=row4=0;

if(col1==0)

{

recharge=1;

t=1;

keypad();

break;

}

}

if(t==1)

break;

} 

}

}

t=0;

lcd_command(0x01);

lcd_string(“Pls scan your ID”); 

break;

}

}

if(flag==0)

{

lcd_string(“Wrong ID”);

delay(100);

}

if(flag==0)

{

lcd_command(0x01);

lcd_string(“New user press *”);

new_user=1;

}

current_byte=0;

tool=0;

TMOD=0x20; //Enable Timer 1

TH1=0xFD;

SCON=0x50;

TR1=1;

IE=0x94;

}

 

recharge_acc()

{

unsigned char pin;

lcd_command(0x01);

lcd_string(“Pls enter the”);

lcd_command(0xC0);

lcd_string(“Balance”);

delay(250);

lcd_command(0x01);

while(set!=1)

{

keypad();

delay(40); 

}

set=0;

lcd_command(0x01);

lcd_string(“Your balance is”);

for(pin=0;pin<=pos;pin++)

{

number=number+money[pos-pin-1]*pointer;

pointer=pointer*10;

}

amount[user_index]=amount[user_index]+number;

lcd_command(0xC0);

lcd_display(amount[user_index]);

lcd_command(0xCD);

lcd_string(“.00”);

delay(250);

lcd_command(0x01);

number=0;

pointer=1;

pos=0;

lcd_string(“Pls scan your ID”);

}

 

void memory()

{

unsigned char i,key=0,count,pin,try=0;

lcd_command(0x01);

lcd_string(“New user scan ID”);

current_byte=0;

while(current_byte!=12);

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

{ 

key=0;

for(count=0;count<12;count++)

{ 

if(card_id[count]==card_mem[count])

{

key++;

}

}

if(key==12)

{

lcd_command(0x01);

lcd_string(“Sorry ! You are”);

lcd_command(0xC0);

lcd_string(“already an user”); 

delay(200);

lcd_command(0x01);

lcd_string(“Pls scan your ID”);

key=0;

try=1;

current_byte=0;

break;

}

}

if(key<12 && try==0)

{

key=0;

for(i=0;i<12;i++)

{

card_mem[index]=card_id;

}

current_byte=0;

lcd_command(0x01);

lcd_string(“Pls scan again”);

while(current_byte!=12);

for(i=0;i<12;i++)

{

if(card_mem[index]==card_id)

{

key++;

}

}

current_byte=0;

TMOD=0x00;

TH1=0x00;

SCON=0x00;

TR1=0;

IE=0x00; 

if(key==12)

{

lcd_command(0x01);

lcd_string(“Congratulation !”);

lcd_command(0xC0);

lcd_string(“You are User”);

lcd_command(0xCC);

lcd_data(index+49);

delay(250);

lcd_command(0x01);

lcd_string(“Pls enter the”);

lcd_command(0xC0);

lcd_string(“Balance”);

delay(150);

lcd_command(0x01);

while(set!=1)

{

keypad();

delay(40); 

}

set=0;

lcd_command(0x01);

lcd_string(“Your balance is”);

for(pin=0;pin<=pos;pin++)

{

number=number+money[pos-pin-1]*pointer;

pointer=pointer*10;

}

lcd_command(0xC0);

lcd_display(number);

lcd_command(0xCD);

lcd_string(“.00”);

amount[index]=number;

delay(250);

lcd_command(0x01);

number=0;

pointer=1;

pos=0;

lcd_string(“Pls scan your ID”); 

}

else

{

lcd_command(0x01);

lcd_string(“ERROR”);

delay(200);

for(i=0;i<12;i++)

{

card_mem[index]=0;

}

lcd_command(0x01);

lcd_string(“Pls scan your ID”);

}

if(key==12)

index++;

}

TMOD=0x20; //Enable Timer 1

TH1=0xFD;

SCON=0x50;

TR1=1;

IE=0x94;

}

 

void main()

{

col1=col2=col3=1;

TMOD=0x20;

TH1=0xFD;

SCON=0x50;

TR1=1;

IE=0x94;

lcd_ini(); //Place cursor to second position of first line 

lcd_string(“Pls scan your ID”);

while(1)

{

row1=row2=row3=row4=0;

if(col1==0)

{

keypad();

}

if(print==1 && new_user==1)

{

memory();

print=0;

new_user=0;

}

if(print==1 && recharge==1)

{

recharge_acc();

print=0;

recharge=0;

}

if(current_byte==12)

{

show();

}

}

}

 

    

 

  sir pls reply me back as soon as possible…

 

 

[khushi]

hi ghuran,

 

Please use port 0 for Data lines that is D0-D7.

 

I mean to say instead of  sfr lcd_data_pin=0xA0; use address 0x80.

 

it will work. u try this & let me know.

[SHAH DISHANT H.]

Hi,

 

lcd_string(unsigned char *disp) //LCD string function 

{

  char x;

  for(x=0;disp[x]!=’’;x++)

{

  lcd_data(disp[x]);

}

}

 

Correct this function…!!!

 

First check LCD without RFID…

[ghuran]

khushi ma’m

                         

                     i hv made d changes as u said, and i simulate the project on ‘proteus’ , but i still get nothing on LCD.

          can u please simulate it on proteus..

            

[ghuran]

SHAH DISHANT H. sir

                            

                               i hv made the changes in the programme but i still get nothing.

 

                                  please help me out of this…

                                        thank u

[ghuran]

Hi,

    

       i have made the changes in programme  and it works,but it only print “pls scan your ID”

         and after that it prints “4 times 1369”. please refer the project “RFID BASED TOLL PLAZA”

            pls help me…!! 

[SHAH DISHANT H.]

Hi,

 

 

In receive interrupt, provide delay. It seems its scanning TAG many times when you are moving it only once.

 

Try with enough Delay and post result back.

[khushi]

hi ghuran,

 

In my previous post u did that minor changes only.

 

all the lcd function given in code which u have mentioned is correct.

 

Please see the below simulation which i have done, i think so u r suppose to missing to keep “resistor array”. i. e Pull up resistor.

 

b’coz Port P0 is open collector port so that it requires.

 

u do it this kind of arrangement it will  definetely work.

 

wysiwyg_imageupload:12117:

[ghuran]

Hi,

        khushi ma’m i hv done the simulation , on the lcd it prints “pls scan your id”, but after that it automatically takes 4 times 1369….

                       here is the simulation..

 

                      

wysiwyg_imageupload:12119:

[ghuran]

Hi, 

      

         i hv successfully done my project, thanxx a lot to KHUSHI ma;m & DISHANT sir

 

             but i’m facing one problem with kepad, when i pressed the keyword it only print 1,4,7

               and for other keywords it prints after i pressed many times…..

                

                  pls let me know…

 

[khushi]

hi ghuran,

 

many congratulations.

 

every keypad routine checks key debounce so once u decrease  it time delay, it will not prints slow.

 

one more thing here in the program which u have posted is checking that if key is pressed continually it will print the no. until u release it.

 

other wise the program is upto date no more changes are required.

 

 

please check once again ghuran. 

[SHAH DISHANT H.]

Congrats…!!

 

Solve keypad with less delay…!!! If not solved, I will send you my tested code for that…!!!

 

 

Keep one thing in mind…!!

Once you have completed your project, do not forget to share it with all…!!!

 

All the best…!!

[kailey jazyln]

hello Sir ,

  Please provide me the correct code of Automatic toll vechicle cateogry system…………………. keypad not working i have to place on another port regardless P0..

[sachin kumar dagur]

Hi.. jhuran can u please provide me the corrected code of Rfid based toll collection system i have also facing same keypad problem in my hardware. pls. share the code so that i can complete my project hardware.

 pls reply me back as soon as possible…

[sachin kumar dagur]

hello Dishant Sir ,

                              I m facing problem in toll collection vechicle category system in keypad connected at PORT 0 in hardware pls suggest me the solution . 

                               

[Author]

Posts