GSM getting started...

jojos · Joined: 30 Apr 2007 Posts: 64

Hello. I am new to gsm modules. I wanted to ask some general questions:

1)I want to control a Gsm module (Samed Hilo NC) from my PC through RS232 adapter but in the same I want to be able to send AT commands from a microcontroller. Is that possible? If yes how would it be the connection? Will I have to put a MAX232 for the pc to gsm module communication and another Max232 for the PIC to gsm module communication ?

2)Is there a way of sending an SMS like "Make Set port 1 as output" and then this sms to be converted to the appropriate AT command (so I can create a user friendly control environment for the gsm module)? If yes, does this way involve a microcontroller in the way that when gsm module receives an sms, then the microcontroller receives that sms and converts it to an AT command and then back to gsm module ?

Thanks a lot and sorry for the lengthy query.

bkamen · Posted: Tue Oct 06, 2009 8:37 pm

It sounds like you haven't read any of the datasheets.

The answers to your questions are a definite probably with the caveats of some maybes.

This forum is specifically for users designing embedded microcontroller projects coded with CCS's PIC-C.

If you need specific design assistance with a GSM module, your best bet is to contact the maker of the module.

Cheers,

-Ben
_________________
Dazed and confused? I don't think so. Just "plain lost" will do. :D

jojos · Joined: 30 Apr 2007 Posts: 64

I read some datasheets already but it is too much data.Gues i will have to choose the best of them.I agree this is a CCS forum sorry.Ok then as for the PIC part of my project is it possible to use the RS232 of the gsm module
with the computers RS232 and the PIC's RS232?I mean can i connect together computers RS232 and PIC's RS232?Thank you

bkamen · Posted: Wed Oct 07, 2009 10:10 am

a couple of years ago, I designed a GSM & Microntroller remote sensing gizmo for someone.

So yes, it's possibly for a PIC with a UART via RS232 (possibly without level shifters depending on the type of interface on the GSM module).

As for having a PC control the PIC which controls the module, yes. For best performance, you'd want a PIC with 2 UARTS like the PIC18FxxJ11 series or maybe the J60 series -- or dive into the high performance PIC24 series which have upwards of 4 UARTs on a single PIC.

As for there being "too much" datasheet to read -- Welcome to technology! It has to be read though and you the designer has to read it.

-Ben
_________________
Dazed and confused? I don't think so. Just "plain lost" will do. :D

jojos · Joined: 30 Apr 2007 Posts: 64

thank you bkamen for the help. I think i will go to the 18fxx option .

bkamen · Posted: Thu Oct 08, 2009 12:15 pm

Sounds good. Look for the 18FxxJ11 options. They have 2 UARTs in a low (manageable) pin-count.

If you're not a surface mount soldering kinda guy, you'll want a DIP version. The J11 series has one in a 28pin DIP.

-Ben
_________________
Dazed and confused? I don't think so. Just "plain lost" will do. :D