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8051 to control GSM modem

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Moderators: Ajay, Junied , abbas1707, Arun Kumar V, pdi33, Shailesh NAYAK, ۞ TPS ۞, shyam, sashijoseph

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Ajay

Fri May 30 2008, 12:46AM

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for this you need to do some string manipulation functions..
see the response you get from AT Commands will always be in the above format.
after the above string you will have the sms data.. and then OK
something like this.

+CMGR: "REC UNREAD", "0146290800",
"98/10/01,18:22:11+00", ABCdefGHI
OK

you can create function which can break this string into parts so that you can get extract information from it.
so do this..
look for index of first "," (comma) and then after that keep reading the string from starting quote to ending quote. you have your number in between that.

c example:

CODE:

while(*response != ',')

        response++;

//after you come out of the above loop you reached the starting of number

response++; //bypass the space

response++; //bypass quote

while(*response != '"'){

        *number = *response;

        number++;

        response++;

}

now string number will have your number

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Judgement

Judgement

Fri May 30 2008, 01:28PM

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Hey, thanks.
I'll try that out.

Shailesh NAYAK

Wed Jun 04 2008, 05:21PM

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Hi,
You can register yourself in Wavecom Website. and can get downloaded AT Command Interface guide. Also try to get some basic knowledge of GSM modem and phone behavior, so it will be more helpful for you to interface with MICON.

Best Regards

Shailesh S. NAYAK

Judgement

Tue Jun 24 2008, 07:07PM

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Alright, I can get my 8051 to communicate with my serial port and now I have another problem. How do I send sms with the GSM in C? I know how to send strings to read and delete SMS but I have a problem with sending SMS.

Sending SMS for my GSM is:
AT+CMGS = +123456789 [enter button]
<sms message here> [control+Z]

The problem is I don't know how to input the enter button and the control+Z into the string. Thanks.

say2paul

Tue Jun 24 2008, 10:46PM

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Judgement wrote ...

\r\n should work here, if don't then you can try with the hex code of Line feed/Carriage return. I had not tried it yet so don't know if it works!

Judgement

Wed Jun 25 2008, 12:04AM

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say2paul wrote ...

Judgement wrote ...

\r\n should work here, if don't then you can try with the hex code of Line feed/Carriage return. I had not tried it yet so don't know if it works!

Hmm..I've thought of using \r\n as well but I haven't tried it out yet. I don't think it works that way...

say2paul

Wed Jun 25 2008, 01:21AM

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Judgement wrote ...

say2paul wrote ...

Judgement wrote ...

\r\n should work here, if don't then you can try with the hex code of Line feed/Carriage return. I had not tried it yet so don't know if it works!

Hmm..I've thought of using \r\n as well but I haven't tried it out yet. I don't think it works that way...

You are lucky you reached at the point where you are sending AT commands from 8051 to mobile phone.

I am still finding how to connect my mobile phone with microcontroller

Judgement

Wed Jun 25 2008, 04:27AM

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say2paul wrote ...

You are lucky you reached at the point where you are sending AT commands from 8051 to mobile phone.

I am still finding how to connect my mobile phone with microcontroller

Well, I'm using a GSM modem instead of a mobile phone. I think its easier to configure the 8051 to communicate with the GSM as compared to a mobile phone. Good luck on your project.

Judgement

Wed Jun 25 2008, 06:13PM

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I have 1 more question. I'll post it up with my old question.

Alright, I can get my 8051 to communicate with my serial port and now I have another problem. How do I send sms with the GSM in C? I know how to send strings to read and delete SMS but I have a problem with sending SMS.

Sending SMS for my GSM is:
AT+CMGS = +123456789 [enter button]
<sms message here> [control+Z]

The problem is I don't know how to input the enter button and the control+Z into the string in C language. Thanks.

Also, I want to do something like a timed SMS. The user send an SMS eg. 1 Hour.
Then, the 8051 programs the GSM modem to send an SMS 1 hour later. How can I do something like that in C language? Thanks.

Judgement

Thu Jun 26 2008, 12:27AM

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Ok, I've solved the sending SMS problem. However, I still have some problems with the timed SMS thing.
Hope to see some replies soon. Thanks.

[ Edited Thu Jun 26 2008, 12:28AM ]