Published January 31, 2016 © LGPL

electricity meter reading via SMS

Usually in india a person has to go and check the meter reading after every three months and it is quite a hectic and long process.

IntermediateFull instructions provided2,153

Things used in this project

Hardware components

electricity meter

GSM modem

AT89C51 ic

33 PF CAPACITOR

Capacitor 10 µF

CRYSTAL 11.0592MHZ

TECTILE SWITCH

10 K RESISTANCE

24C04 ic

8 PIN IC BASE

TRANSISTOR BC547

TRANSFORMER 12-0-12 V

1N4007 – High Voltage, High Current Rated Diode

Linear Regulator (7805)

Capacitor 1000 µF

Hand tools and fabrication machines

Soldering iron (generic)

Story

As receiving the electricity meter reading is quite a complex work in India because the person use to go every house and note the reading so the main objective of the project is to receive the reading via SMS to save manpower and time.

Video to easy understand

Designing:

1) Power Supply Design

It is designed by using 2 pin power plug then the transformer 12 - 0 - 12 which will step down the 220 v ac to 12 - 0 - 12 ac which is converted to DC voltage using bridge rectifier section having diode in4007 and capacitor 1000uf and voltage regulator 7805.

2) Electricity Meter for Reading

One electricity meter is taken for reading

The meter that is used here is single phase meter which is not the standard meter and tempered to make the project

So it can't be used directly at homes until the project has been finalized by the government laws.

3) Device for updating reading

One device should be connected to meter, so the reading should be updated at regular intervals.

4) GSM Modem

As we are making the system to receive SMS and transmit it, so a GSM modem should be connected to do the required task.

5) Controlling Section

Controlling section is used to update the value and store it in EEPROM memory so it can be transferred through SMS.

The controller section also verifies the SMS and send the feedback sms on the same number from which it received the SMS.

Code

project code

#include<reg51.h>	   	 
#include<intrins.h>	  

sbit meter=P2^0;

sbit SCL=P3^2;
sbit SDA=P3^3;

void delay(unsigned int w)
{
unsigned int q;
for(q=0;q<w;q++);
}

void start()
{
   SDA = 1 ;	   _nop_() , _nop_() , _nop_() ;
   SCL = 1 ;	   _nop_() , _nop_() , _nop_() ;
   SDA = 0 ; 	   _nop_() , _nop_() , _nop_() ;
   SCL = 0 ;	   _nop_() , _nop_() , _nop_() ;
}

void stop()
{
   SDA = 0 ;	 _nop_() , _nop_() , _nop_() ;
   SCL = 1 ;	 _nop_() , _nop_() , _nop_() ;
   SDA = 1 ;	 _nop_() , _nop_() , _nop_() ;
   SCL = 0 ;	 _nop_() , _nop_() , _nop_() ;
}

void clock()
{
   SCL = 1 ;	 _nop_() ; _nop_() ; _nop_() ;
   SCL = 0 ;	 _nop_() ; _nop_() ; _nop_() ;
}

void nack()
{
    SDA = 1 ;	  clock() ;
} 


void waitack()
{
    SDA = 1 ;	  clock() ;
}

void opdat(unsigned char dat)
{
   unsigned char i ;
   for ( i = 0 ; i < 8 ; i++ )
   {
      if ( ( dat >> ( 7 - i ) ) & 0x01 ) 	SDA = 1 ; 
      else	 			SDA = 0 ;
      clock() ;
   }
}

void i2c_write(unsigned char dat,unsigned char addr)
{                   	
	start();		 //dummy write start 	
	opdat(0xa0);	//send dev addr
	waitack();
	opdat(addr);
	waitack();
	opdat(dat);		//write data
	waitack();
	stop();
}	
		
unsigned char getdat()
{
   unsigned char i , dat;
   SDA = 1;	   _nop_() , _nop_() , _nop_();
 for ( i = 0 ; i < 8 ; i++ ) 
   {
	  dat = ( ( ( dat << 1 ) & 0xfe ) | SDA );
	  clock();
   }
   return dat;
}

unsigned char i2c_read(unsigned char addr)
{ 
 unsigned char rdata;
start();		//dummy write start
opdat(0xa0);	//send dev addr
waitack();
opdat(addr);
waitack();
	start();				//start read
       opdat(0xa1);   //give device adddr or with for read 
        waitack();	//operation coz lsb gives r|w
        rdata = getdat();
        nack() ;
        stop() ;
        return(rdata);
}

void tx(unsigned char num)
{ 
SBUF = num;
while(TI == 0);
TI = 0;
}

void tx_str(unsigned char *y)
{
while(*y!='\0')
	{
		tx(*y);
		y++;
	}
}

void main()
{
unsigned int e;
unsigned char x,r,q,w,t,y,u,i,arr1[6],arr[20],arr2[15];

SCON=0x50;
TMOD=0x20;
TH1=0xfd;
TR1=1;										
   						
delay(60000); 					 
delay(60000); 	
delay(60000); 					 
delay(60000); 	
delay(60000); 					 
delay(60000); 	
delay(60000); 					 
delay(60000); 	
delay(60000); 					 
delay(60000); 	
delay(60000); 					 
delay(60000); 					 
delay(60000); 	
qwe: 
tx_str("AT");
tx(0x0d);			  
delay(60000);	
tx_str("AT+CMGF=1");
tx(0x0d);	  
delay(60000);					 
delay(60000); 	
 
while(1)
{
if(meter==1)
{
x=i2c_read(7);
delay(100);
if(x<9)
{
i2c_write((x+1),7);
delay(12000);
}		   
else
{
i2c_write(0,7);
delay(1200);
w=i2c_read(6);
delay(100);
if(w<9)
{
i2c_write((w+1),6);
delay(12000);
}
else
{
i2c_write(0,6);
delay(1200);
q=i2c_read(5);
delay(100);
if(q<9)
{
i2c_write((q+1),5);
delay(12000);
}
else
{
i2c_write(0,5);
delay(1200);
r=i2c_read(4);
delay(100);
if(r<9)
{
i2c_write((r+1),4);
delay(12000);
}
else
{
i2c_write(0,4);
delay(1200);
t=i2c_read(3);
delay(100);
if(t<9)
{
i2c_write((t+1),3);
delay(12000);
}
else
{
i2c_write(0,3);
delay(1200);
y=i2c_read(2);
delay(100);
if(y<9)
{
i2c_write((y+1),2);
delay(12000);
}
else
{
i2c_write(0,2);
delay(1200);
u=i2c_read(1);
delay(100);
if(u<9)
{
i2c_write((u+1),1);
delay(12000);
}
else
{
i2c_write(0,1);
delay(1200);
i=i2c_read(0);
delay(100);
if(i<9)
{
i2c_write((i+1),0);
delay(12000);
}
}
}
}
}
}
}
}	
}
if(RI==1)
{
w=SBUF;
RI=0;
if(w=='+')
{
e=0;
while(RI==0)
{
e=e+1;
if(e>30000)
goto qwe;
}
RI=0;
q=SBUF; 
e=0;
while(RI==0)
{
e=e+1;
if(e>30000)
goto qwe;
}
RI=0;
q=SBUF; 
e=0;
while(RI==0)
{
e=e+1;
if(e>30000)
goto qwe;
}
RI=0;
q=SBUF; 
if(q=='T')
{
delay(30000);
tx_str("AT+CMGR=1");
tx(0x0d);					 
delay(60000); 
zxc:	   
e=0;
while(RI==0)
{
e=e+1;
if(e>30000)
{
goto qwe;
}
}
RI=0;
r=SBUF; 
if(r!=':')
goto zxc;		
r=0;
xcv:	   
e=0;
while(RI==0)
{
e=e+1;
if(e>30000)
{
goto qwe;
}
}
RI=0;
r=SBUF; 
if(r!='+')
goto xcv;		
r=0;
asd:   
e=0;
while(RI==0)
{
e=e+1;
if(e>30000)
{
goto qwe;
}
}
RI=0;
arr2[r]=SBUF;
r=r+1;
if(SBUF!='"')
goto asd;
r=0;
wer:	   
e=0;
while(RI==0)
{
e=e+1;
if(e>30000)
{
goto qwe;
}
}
RI=0;
r=SBUF; 
if(r!='*')
goto wer;	
r=0;
ert:   
e=0;
while(RI==0)
{
e=e+1;
if(e>30000)
{
goto qwe;
}
}
RI=0;
arr[r]=SBUF;
r=r+1;
if(SBUF!='#')
goto ert;
if(r==11)
{		
if(arr[0]=='R' && arr[1]=='E' && arr[2]=='A' && arr[3]=='D' && arr[4]=='I' && arr[5]=='N' && arr[6]=='G' && arr[7]==' ' && arr[8]=='1' && arr[9]=='1')
{  
for(t=0;t<8;t++)
{
arr1[t]=i2c_read(t);
delay(100);
} 
tx_str("AT+CMGS=");
tx('"');
tx('0');
for(t=2;t<12;t++)
{
tx(arr2[t]);
}
tx('"');
tx(0x0d);
delay(20000);
tx_str("VALUE - ");
for(t=0;t<8;t++)
{
tx(0x30+arr1[t]);
if(t==4)
tx('.');	
}
tx(0x1a); 
delay(60000);
delay(60000);
delay(60000);
delay(60000); 
goto qwe;
}
}
}
goto qwe;
}
}  
}
}

Credits

Sumit Grover

8 projects • 31 followers

electricity meter reading via SMS

Things used in this project

Hardware components

Hand tools and fabrication machines

Story

1) Power Supply Design

2) Electricity Meter for Reading

3) Device for updating reading

4) GSM Modem

5) Controlling Section

Schematics

circuit diagram

Code

project code

Credits

Sumit Grover

Comments

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electricity meter reading via SMS

electricity meter reading via SMS

Things used in this project

Hardware components

Hand tools and fabrication machines

Story

1) Power Supply Design

2) Electricity Meter for Reading

3) Device for updating reading

4) GSM Modem

5) Controlling Section

Schematics

circuit diagram

Code

project code

Credits

Sumit Grover

Comments

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