Help on RFID Toll plaza system based on vehicle category interface with 8051 microcontroller (AT89C51)

[mohammed Fahad]

HI All,

 

i am working on this circuit 

Toll plaza system based on vehicle category interface with 8051 microcontroller (AT89C51)

i am not able to get few things:

 

1.what is the polarity of the capacitor connected to Max232 and 89c51

2.does any body have proteus schematics and code avilable for the project

3.when i run the simulator there is nothing on the screen

 

Thanks and Regards,

Fahad

[Ashutosh Bhatt]

Capacitors connected to 8051 are non polarized.
With max232 u have to connect polarized capacitors
U just post ur problem with circuit n ur code. We will try to help

[mohammed Fahad]

wysiwyg_imageupload:12427:

//Program for a simple toll plaza system using low frequency RFID interfaced with 8051 microcontroller (AT89C51)

#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();

}

}

}

[Ashutosh Bhatt]

with virtual terminal you need not to connect MAX232.
directly connect TX with RX and vice versa of 8051 and virtual terminal

[Jaymin D]

Hello,

 

I made this type of project by myself with completely running mode and coding and circuit by my self.

 

i.e. for car it deposite toll 30 Rs.

for truck / bus toll is 50 Rs.

very hevy vehicle toll is 100 Rs.

 

Its show these on LCD 16×2 with IC AT89S52 and EM – 18 RFID reader.

Complete project is ready with 2200 Rs. with 3 catagory vehicle..(mean 3 RFID card)

 

also I made project on 8051 so if you unterested in this just mail me or msg me if I can help you in this issue.

 

email : project[dot]student123[at]gmail[dot]com

 

or just google the DABHI ELECTRONICS and go to electronics project[dot]webs website..

 

Really it very very low cost..

 

Also if you want any support in h/w or s/w related of 8051 then you can ask me and also for buy any components at very very low cost.

 

 

Thanks

 

It may be helpful to you

 

Best Luck

 

Regards

 

Jaymin D

[hami]

c code version is lemited how to increse microvresion means icrease the byte of keli version ?

please give the visible circut digram of project/

 

[Author]

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