AT89s52 uc and nokia 6610i Interfacing to send SMS

[rememberramu]

Hello,
I am doing a project, I have to send and receive sms using microcontroller.
I am using AT89s52 microcontroller and nokia 6610i mobile phone. I have successfully sent and red sms from hyper terminal of PC. So nokia 6610i supports required at commands.

Then I cut the serial data cable (DUK 50) of nokia 6610i, and made serial interface in microrontroller using max232 IC. I have connected Tx Rx and ground pin of mobile i.e. ( pin no. 6 for Rx , pin no. 7 for Tx and pin no. 8 for GND) to the max 232 . The microcontroller circuit perfectly communicates with hyperterminal.

I have wrote code to send sms from mobile in c. Because I have keil compiler which convert .C code to .hex . Here is my actual code in C.

#include<reg51.h>
void sertx(unsigned char x);
void main(void)
{
	unsigned char i, j, k, l;
	unsigned char txstr[]="at+cmgf=1";
	unsigned char txstr1[]="at+cmgs=\"9841871924\"";
	unsigned char txstr2[]="abc";
	TMOD=0x20;
	TH1=0xFD;
	SCON=0x50;
	TR1=1;
	P2=0x00;
	sertx(0x0D);
	sertx(0x0A);	
	for(i=0; i<9; i++)
		{
			sertx(txstr[i]); 
			
		}
	for(j=0; j<10; j++) 
		for(k=0; k<250; k++)
			for(l=0; l<250; l++);
	sertx(0x0D);
	sertx(0x0A);
	for(i=0; i<20; i++)
		{
			sertx(txstr1[i]); 
			
		} 
	for(j=0; j<5; j++) 
		for(k=0; k<250; k++)
			for(l=0; l<250; l++);

		sertx(0x0D);
		sertx(0x0A);
		for(i=0; i<3; i++)
		{
			sertx(txstr2[i]); 
			
		} 
		sertx(0x1A);  
	
while(1);	
	
}


void sertx(unsigned char x)
{
			SBUF=x;
			while(TI==0);  
				TI=0;
}

I am getting required command in hyper terminal but mobile is not sending sms. I don't know where to start debugging.

Can you please help me.
Please provide me circuit diagram for microcontroller and 6610i interfacing, and also code for sending SMS.

Regards, Ram

 

[jmoha]

i have exactly the same project and newbie, did u finish ur project ?