sms tranmission through GSM MODEM 8051

[Surya Gupta]

i need help. i have run the below code sucessfully in proteus ….but stuck in my matrix circuit ….can any1 give any details why the msg is not transmitting . can any1 give simple msg sending code or edit the below code.

 

 

 

 

                                                          // Program to interface GSM Module with 8051 microcontroller (AT89C51) using PC and LCD
#include<reg51.h>
#define port P2
#define dataport P0            // Data port for LCD
sbit rs = port^5;
sbit rw = port^6;
sbit en = port^7;
//sbit pi= port^3;
int count=0,i,j=0,k=0;                   
//unsigned char check,str_cz[2]={0x1A,’’};
unsigned char str[15],str_index[10];

//bit check_space ;

void init_serial()            // Initialize serial port
{    TMOD=0x20;    
    TL1=0xfd;        // Mode=2    
    TH1=0xfd;            // 9600 baud    
    SCON=0x50;            // Serial mode=1, 8-Bit data, 1 Stop bit, 1 Start bit, Receiving on    
    TR1=1;                // Start timer
    }
    
void delay(unsigned int msec )        // Function for delay
{    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 on LCD
{    
    dataport = item;    
    rs= 0;
    rw=0;
    en=1;
    delay(1);
    en=0;    
    return;
    }

 void lcd_data(unsigned char item)            // Function to display character on LCD
 {
     dataport = item;    
    rs= 1;    
    rw=0;
    en=1;    
    delay(1);    
    en=0;    
    return;
    }    
 
 void lcd_data_string(unsigned char *str)                  // Function to display string on LCD
 {    
     int i=0;    
    while(str!=’’)    
    {    
          lcd_data(str);
          i++;
          delay(10);                    
                }    
    return; }

void lcd()
{
    lcd_cmd(0x38);                    // For using 8-bit 2 row LCD     
    delay(5);                            
    lcd_cmd(0x0F);                    // For display on, cursor blinking
    delay(5);
    lcd_cmd(0x80);                    // Set the cursor on first position of lcd
     delay(5);                        
     }
     
void transmit(unsigned char *str)
{
    
     int i=0;    
    while(str!=’’)    
    {    
        EA=0;
        SBUF = str;
         while(TI!=1);
         delay(1);
         i++;
         EA=1;
         }
}

void transmit1(unsigned char str)
{
    SBUF=str;
    while(TI!=1);
    TI=0;
}
void receive_data()  interrupt 4          // Function to recieve data serialy from RS232 into microcontroller
{    

if(RI==1)
{
    str[++count]=SBUF;         //Read SBUF    
    if(str[count-1]==’,’|| (k=1) )
    {
        str_index[j]=str[count];
        j++;
        k=1;
    }    
        RI=0;
//        k=1;

     }
}  
                                          /*
unsigned char byte_check()         //Function to check carraige return and new line character
{
    switch(str[0])    
    {        
        case 0x0a:        
        {            // Return 0x00 for new line    
            return 0x00;    
                break ;
                        }        
       
        case 0x0d:        
        {            // Return 0x01 for carriage return        
            return 0x1;        
            break ;        
            }
               
        default:
       
        return 0x02 ;        // Return 0x02 for characters except new line and carriage return
            }
            }                                */
           
void main()
{     
//unsigned char cz;
    lcd();                        // Initialize LCD
    init_serial();
    delay(400);                    // Initialize serial port
    lcd_data_string(“sending msz”);
    delay(100);
    //lcd_data(‘a’);
    //delay(10);
    //lcd_cmd(0xc0);
    count=(-1);
    //lcd_data_string(“Ready…123”);
    //delay(10);                            
    lcd_cmd(0xc0);        
        IE=0x94;    
//    cz=0x1A;
    
//transmit(“ATrAT+CMGF=1rAT+CMGS=”+9779841540672″rTest Message 123”);
//transmit(str_cz);

//delay(40);
ES=0;
transmit(“AT+CMGF=1r”);
delay(1000);
//transmit(“AT+CSCS=”GSM”r”);
//delay(400);
//transmit(“AT+CSCA=”+97798……..”,145r”); //service center no
//delay(400);
//transmit(“AT+CSMP=17,167,0,240r”);    //text mode format
//delay(400);
transmit(“AT+CMGS=”+97798……….”r”);//my mob number here
//delay(400);
transmit(“Test Message 123”);
//delay(400);
transmit(0x1A);
lcd_data_string(“msz sent”);
delay(1000);
ES=1;
//pi=0;

}

[AJISH ALFRED]

Hi Surya,

Make sure that you explain a bit more detailed about your projet allabouts, and then the problem which you are facing. A block diagram or schematic diagram will be more useful. Then only someone can go through your code and analyze. Also make sure that you’ve commented the code properly.

[ankit mishra]

can any one tell me the coding in bascom language to interface the gsm module with atmel8051 microcontroller ,

[sra1]

thanks dude……………..

[pardeep]

hello sir i m working on gsm based security sysem   . i m using phillips mcu 89v51rd2. gsm modem sim300. will u please send me some details for interfacing and programing in c.

[AJISH ALFRED]

Hi all,

Please refer the following link;

http://www.engineersgarage.com/microcontroller/8051projects/gsm-interface-8051-microcontroller-circuit-code

[25]

Excellent description of code and circuit

[M.ilyas]

hi surya .hope u will b fine .dear i need ur help .i m making the same project as u made before .plz dear send me complete tutorial from strt to end if u can..i will b very thanfull to u for this act ..

                   thanks 

 

[Subin G]

Hello, can youp please give the c program for interfacing gsm module with 8051 without using pc…also am not using any LCDs..Please help

[Ashutosh Bhatt]

you just read the theory of how to interface GSM with 8051. u will get full idea that how to send AT commands to GSM modem using 8051

[Author]

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