PROJECT 2. HOME/OFFICE SECURITY SYSTEM

DESIGN

            The main control circuit is around the microcontroller PIC 16F877A. Home /office security system consists of a sensor circuit to identify the interruption in restricted or secure place. If an interruption is detected a HIGH pulse is sent to a port of the microcontroller. That is identified as an insecure condition. So the controller then sends message of insecure condition and also calls to a predetermined phone number. The optional provision is included to send a message in a specified format to command for unlocking the locked gate.

HOME/ OFFICE SECURITY SYSTEM

PIC16F877A features

Up to 8K x 14 words of Flash Program Memory,

Up to 368 x 8 bytes of Data Memory (RAM),

Up to 256 x 8 bytes of EEPROM Data Memory

CODE

#include <16F877A.h>

#device adc=8

#FUSES NOWDT                    //No Watch Dog Timer

#FUSES XT                       //Crystal osc <= 4mhz

#FUSES NOPUT                    //No Power Up Timer

#FUSES NOPROTECT                //Code not protected from reading

#FUSES NODEBUG                  //No Debug mode for ICD

#FUSES NOBROWNOUT               //No brownout reset

#FUSES NOLVP                //No low voltage prgming, B3(PIC16) or B5(PIC18) used for I/O

#FUSES NOCPD                    //No EE protection

#FUSES WRT_50%                  //Lower half of Program Memory is Write Protected

#use delay(clock=4000000)

#use rs232(baud=9600,parity=N,xmit=PIN_C4,rcv=PIN_C5,bits=8,stream=gsm)

int i,j,f=0,flag1=0;

char a,x;

char str[70]="SECURITY ALERT...MAIN GATE HAS BEEN LOCKED! SEND <*ULK*> to unlock";

const char m0[4]  = "AT\r";

const char m1[11] = "AT+CMGF=1\r";

const char m2[22] = "AT+CMGS=\"9496084923\"\r";

const char m3[11] = "AT+CMGR=1\r";

const char m4[11] = "AT+CMGD=1\r";

const char m5[13] = "ATD9037474098\r";

char str1[5], str2[5] = “ULK”;

;

void receive();

void msg();

void call();

short timeout_error;

char timed_getc()

 {

   long timeout;

   timeout_error = FALSE;

   timeout = 0;

   while(!kbhit()&&(++timeout<5000))

   delay_us(10);

   if(kbhit(gsm))

   return(fgetc(gsm));

   else

    {

     timeout_error = TRUE;

     return(0);

    }

 }

///////////////////////////////////////////////////////  call   /////////////////////////////////////////////////////////////////////

void call()

  {

   for(i=0;i<14;i++)

   {

   fputc(m5[i],gsm);

   a=timed_getc();

   }

   a=timed_getc();

   a=timed_getc();

  }

////////////////////////////////////////////////////////////        msg sending         ////////////////////////////////////////

void msg()   

 {

  for(i=0;i<3;i++)

   {

   fputc(m0[i],gsm);

   a=timed_getc();

   }

   a=timed_getc();

   a=timed_getc();    

for(i=0;i<10;i++)

   {

   fputc(m1[i],gsm);

   a=timed_getc();

   }

   a=timed_getc();

   a=timed_getc();

for(i=0;i<21;i++)

   {

   fputc(m2[i],gsm);

   a=timed_getc();

   }

   a=timed_getc();

   a=timed_getc();

for(i=0;str[i]!='\0';i++)

   {

   fputc(str[i],gsm);

   a=timed_getc();

   }

   a=timed_getc();

   a=timed_getc();

   delay_ms(100);

   fputc(0X1A,gsm);

   a=timed_getc();

   output_bit(PIN_a3,1);  

   delay_ms(100);

   output_bit(PIN_a3,0);

 }

//////////////////////////////////////////////////////////   receive      /////////////////////////////////////////////////////////

void receive()

   {

   for(i=0;i<3;i++)

   {

   fputc(m0[i],gsm);

   a=timed_getc();

   }

   a=timed_getc();

   a=timed_getc();  

for(i=0;i<10;i++)

   {

   fputc(m1[i],gsm);

   a=timed_getc();

   }

   a=timed_getc();

   a=timed_getc();

output_bit(PIN_a4,1);  

delay_ms(300);

output_bit(PIN_a4,0);

for(i=0;i<10;i++)

   {

   fputc(m3[i],gsm);

   a=timed_getc();

   }

   a=timed_getc();

   a=timed_getc();   

while(a!='*')

   {

   a=timed_getc();  

   }    

for(i=0;str1[i-1]!='*';i++)

   {

   a=fgetc(gsm);

   str[i]=a;

   }

str[i-1] = '\0';

a=timed_getc();

a=timed_getc(); 

for(i=0;i<10;i++)

   {

   fputc(m4[i],gsm);                         //delete memory of modem

   a=timed_getc();

   }

   a=timed_getc();

   a=timed_getc();

output_bit(PIN_a5,1);  

delay_ms(100);

output_bit(PIN_a5,0);  

   }

   void main()

  {

       while(1)

        {

        delay_ms(300);

        while(!input(pin_A0)); 

        call();

        msg();

        output_high(PIN_A1);                   //LOCKING

        receive();

        if(strcmp(str1,str2) ==0)

        output_low(PIN_A1);                    //UNLOCKING

         reset_cpu();

        }

 }

                                                    

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