8051 Microcontroller Projects AVR PIC Projects Tutorials Ebooks Libraries codes : Forum / topic http://www.8051projects.net/ Learn to make simple microcontroller projects, pic, 8051, avr and arm projects. download 8051 projects, tutorials, libraries, sample codes. join the microcontroller discussion forum and ask doubts regarding electronics. the best source for 8051 over internet. en-gb Creative Commons LicenseThis work is licensed under a Creative Commons Attribution-Noncommercial 2.5 India License.Rickey's World Disclaimer Ajay Bhargav - contact@nospam.com contact@nospam.com Mon, 01 Dec 2008 23:07:06 -0800 Mon, 01 Dec 2008 23:07:06 -0800 http://backend.userland.com/rss e107 (http://e107.org) 60 Search Search 8051 Microcontroller Projects AVR PIC Projects Tutorials Ebooks Libraries codes query http://www.8051projects.net/search.php i can't recieve information from gsm modem http://www.8051projects.net/forum-t9578.html i have connected the gsm modem with avr. i use printf to send a message and work perfectly but when i use scanf to read from gsm modem nothing happend why???
for example if i run this code
while(1)
{
printf("AT \r\n");
delay_ms(10);
/*Waiting for the response*/
scanf("%s", myData);
PORTB.0 = 1;
delay_ms(1000);
printf("at+cmgs=6938699188");
putchar( CR ); //CR
putchar( LF ); //LF
delay_ms(1000);
printf("%s",myData);
putchar(CTRLZ);
delay_ms(1000);
// if (myData[0] == 'O')
PORTB.0 = 0;
break;
}

i get message writing "AT" but this isn't write i must get "OK".
what must i change to read from gsm modem correct???
please help me time pressure me i have to finish my project until this Monday.
thanks....]]> Thu, 15 May 2008 23:04:35 -0700 http://www.8051projects.net/forum-t9578.html Re: i can't recieve information from gsm modem http://www.8051projects.net/forum-t9578.html "ATE0\r\n"


now if using scanf(), why r u using delay_ms(10) ??
no need at all..
and the syntax for sms should be ( i think)
at+cmgs="6938699188"
please confirm by connecting modem directly to PC via hyperterminal and verify both the commands
1.at+cmgs=6938699188
2.at+cmgs="6938699188"

considering the first command works then=>try modifying the code like this


CODE:

printf("ATE0\r\n");
while(1)
{
printf("AT \r\n");


scanf("%s", myData);
PORTB.0 = 1;

printf("at+cmgs=6938699188\r\n");

printf("%s\r",myData);
putchar(CTRLZ);
delay_ms(1000);
// if (myData[0] == 'O')
PORTB.0 = 0;
break;
}


now if first command does not works then try the second and modify the code as

CODE:

printf("ATE0\r\n");
while(1)
{
printf("AT \r\n");


scanf("%s", myData);
PORTB.0 = 1;

printf("at+cmgs=\"6938699188\"\r\n");

printf("%s\r",myData);
putchar(CTRLZ);
delay_ms(1000);
// if (myData[0] == 'O')
PORTB.0 = 0;
break;
}



u see most of the time scanf itself waits until it receives "\r" so u need not wait...

check and let us know if it works..
till then
]]> shyam<shyam@nospam.com> Fri, 16 May 2008 02:54:04 -0700 http://www.8051projects.net/forum-t9578.html Re: i can't recieve information from gsm modem http://www.8051projects.net/forum-t9578.html

does that mean u not recving message ?? or u recving msg with nothing to display??
]]> shyam<shyam@nospam.com> Sat, 17 May 2008 21:37:12 -0700 http://www.8051projects.net/forum-t9578.html Re: i can't recieve information from gsm modem http://www.8051projects.net/forum-t9578.html please help me time pressure me and i don't know what to do...]]> agnostos<d_agnostos@nospam.com> Sat, 17 May 2008 02:48:27 -0700 http://www.8051projects.net/forum-t9578.html Re: i can't recieve information from gsm modem http://www.8051projects.net/forum-t9578.html null modem - avr
2 -------> 3
3 -------> 2
5 -------> 5
i do the same from other side (null modem with gsm modem)
is my connection good???]]> agnostos<d_agnostos@nospam.com> Sat, 17 May 2008 03:08:21 -0700 http://www.8051projects.net/forum-t9578.html Re: i can't recieve information from gsm modem http://www.8051projects.net/forum-t9578.html Check your null modem cable.....if pin2,pin3 at one end is connected to pin3,pin2 at the other end,then this is how you connect......

]]> sashijoseph<sashijoseph@nospam.com> Sat, 17 May 2008 17:31:23 -0700 http://www.8051projects.net/forum-t9578.html Re: i can't recieve information from gsm modem http://www.8051projects.net/forum-t9578.html trinadha<trinadha_raju@nospam.com> Sat, 09 Aug 2008 06:01:23 -0700 http://www.8051projects.net/forum-t9578.html Re: i can't recieve information from gsm modem http://www.8051projects.net/forum-t9578.html receiving SMS will give first unsolicited SM indication with message index no.
first use AT+CNMI=2,1,0,0,0 which will give you unsolicited indication AT+CMTI: "SM",1
with message no. index.
as you receive this, use AT+CMGR=1 ( 1 is nothing but an Index no.).]]> Shailesh NAYAK<nayaktel@nospam.com> Tue, 12 Aug 2008 23:11:48 -0700 http://www.8051projects.net/forum-t9578.html