GSM SIM card interfacing with microcontroller

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krunal_299

Joined: 24 Jan 2008
Posts: 58

21 Sep 2009 13:08 sim card reader with 8051

Hi to All,

I have an idea to interface any GSM SIM card directly to microcontroller but not conceptually clear...
So pls can anyone tell me that it is possible to do that or not....if possible then what kind of microcontroller must be used for that purpose..
is there any mid-interpreting circuitry needed between GSM SIM and microcontroller?

Thanks to All...

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nandhu015

Joined: 11 Feb 2006
Posts: 640
Helped: 46
Location: Tamilnadu, India

21 Sep 2009 13:21 interface microcontroller to gsm mobile

Here it is

http://www.8051projects.net/lofiversion/t2046/Mobile-SIM-Card-Reader.html

Nandhu

krunal_299

Joined: 24 Jan 2008
Posts: 58

21 Sep 2009 14:42 GSM SIM card interfacing with microcontroller

Thanks...Thanks a lot ...Let me go through it...

codewiz

Joined: 14 Sep 2008
Posts: 75

22 Sep 2009 7:01 GSM SIM card interfacing with microcontroller

what special thing can you achieve with interfacing sim card with microcontroller?

krunal_299

Joined: 24 Jan 2008
Posts: 58

09 Oct 2009 13:02 GSM SIM card interfacing with microcontroller

Special!!!!
I want to read incoming SMS and send SMSes to any cell phone....I think i need some antenna based interfacing circuit to be used with microcontroller
Let me know what are the available options ???
Regards!!!

nandhu015

Joined: 11 Feb 2006
Posts: 640
Helped: 46
Location: Tamilnadu, India

09 Oct 2009 14:12 Re: GSM SIM card interfacing with microcontroller

krunal_299 wrote:

If you want to receive or send sms you need a gsm phone. Not simply card. Try a mobile phone which supports AT commands or a gsm modem

Nandhu

amila133

Joined: 13 Oct 2009
Posts: 28
Location: Sri Lanka

19 Oct 2009 8:00 Re: GSM SIM card interfacing with microcontroller

Hi to All,
I also want send and read SMS using PIC and I want to use AT commands. Although I found lot of details of AT commands I confuse to use them with PIC.
I am going to use MikroC for PIC programming.
By simple code example can any one explain me?

fiolin

Joined: 22 Jul 2009
Posts: 27
Location: Uruguay

19 Oct 2009 15:43 GSM SIM card interfacing with microcontroller

See this part of code to send a sms, I've used CCS compiler.

void sms_send()
{
int i;
char sms[30]="Car alarm is sounding";
printf("AT+CMGS="12345678"\n\r");//12345678 phone number
delay_ms(500);
for(i=0;i<30;i++)
{
if(sms[i]=='\0') break;//ask for null character of sms vector when find it go out of for() loop
putchar(sms[i]);
}
delay_ms(500);
putc(26);// send ctrl + Z
return;
}

Added after 3 minutes:

I forgot select text mode with: printf("AT+CMGF=1\n\r"); //add this part before sending AT+CMGS=....

amila133

Joined: 13 Oct 2009
Posts: 28
Location: Sri Lanka

21 Oct 2009 4:34 Re: GSM SIM card interfacing with microcontroller

Thank You very much fiolin, Now I have idea to do my work.
pls tell me what kind of phone should I select this purpose? Text mode or PDU mode. Iam going to do serial communication.

PS23

Joined: 09 Oct 2009
Posts: 9

21 Oct 2009 6:56 Re: GSM SIM card interfacing with microcontroller

Hey,
You should select a phone which supports AT commands, which almost every phone available do. So, you should not have any problem. As for, the Text and PDU mode, you should send a command AT+CMGF=? to the phone to know whether it supports these modes or not.
If the response is (0,1), Then the phone supports both the SMS modes. If it is 0 then it supports only PDU mode and not the Text mode and henceforth...
I should tell you that programing in PDU mode is a little complicated than sending an SMS in Text mode. For further assistance on sending SMS you may consult the link:
www.dreamfabrics.com/sms