Problem with GPS/GPRS/GSM Module V2.0- DFRobot Forum

2012-09-25 23:49:12 hi guys,
i had sent a message by using gprs/gsm/gps module v2.0 by CoolTerm.
I'm coding a skeatch to send SMS by arduino, but it doen't work.

Serial.begin(4800);
Serial.println("AT+CFUN=1");
Serial.flush();
while(Serial.read()!='K');
while(Serial.read()!='y');
Serial.println("AT+CMGF=1");
Serial.flush();
while(Serial.read()!='K');
Serial.println("AT+CMGS=\340935426494\34");
Serial.flush();
while(Serial.read()!='>');
Serial.println("test");
Serial.flush();
Serial.print("\26");
Serial.flush();
while(Serial.read()!='K');
Serial.println("OK");

But the module cannot connect to the GSM network.

Someone can tell me what wrong and how to fix
Thx seadra

2012-09-20 19:55:55 Hi Seadra,

Have you seen these GSM libraries on Google code:
http://code.google.com/p/gsm-shield-ard ... loads/list

I have not tested them with our shield, but i think they should work no problem. Give them a shot.

Hector

2012-09-20 01:42:47 adremitsuo:I use power 9v 2A. But when I insert a sim card, two conection LEDs were off. I use baudrate 9600. I have no idea for this problem. Can you send me a example code to send a SMS or GPRS connect ?
Thx. seadra

2012-09-19 19:16:02 Udelunar: erro 517 is "SIM ToolKit facility not supported" maybe the SIM is blocked.
seandra: do you connect an extern power supply? only the usb don't work andremitsuo

2012-09-19 01:50:32 hi guys,
i have problem with my gps/gsm/gprs v2.1.
Two leds display the connection of gsm and gprs switch off.
some one can tell me why.
please help me.........
thanks lots
my code
i turn on my sim by first instruction
serial1.println("at+cfun=1");
but i don't receive the reply "ok"
. seadra

2012-08-14 23:40:26
I tried with 57000 and still the same, but 38400 is correct. I've included a video of the module, but I think when I write the AT + CSQ module returns 17, I think it looks very fast.

http://www.youtube.com/watch?v=BGIzHZ5m ... ata_player

I tested the card in my phone and send sms messages correctly.

Thx udelunar

2012-08-14 00:38:20 sometimes when i set the Braudrate too high,the Serial port will output character 'j',so I think we can keep the Braudrate under 57600. vector

2012-08-13 23:40:07 Hello, i put at+csq and response:
at+csq +CSQ: 16,0
I think it is good.

I have a power supply of 12v / 1a, is this may be the problem?

I use "CoolTerm" but the use Braudrate to 9600, because if use 115200 , the messages are written wrong.
For example, if I:
AT + CMGF = 1 and Pulse enter,

is written:
at + cmgVj
and does not respond at all.

Thx all. udelunar

2012-08-03 12:55:32 Do you have anything with AT+CSQ ? How is the blinked led ?
I had this kind of problem using less power than needed ; no error message o seemless ; everything is now working fine with 12V/2A
You have to use also coolterm and send CTRL+Z with a 1A HEX
What I am looking for now, is to make a sketch sending GPS data over GPS every hours. But I am stuck !

Max maxpat

2012-08-02 12:21:01 Good day, i buy this module and have a problem with SMS. I use GPS and all perfect, but:

I continue every step of the tutorial

AT ...... OK
AT+CMGF =1 ... OK
AT+CMGS =? + CMS ERROR: 517

I try:
AT+CMGS="35346xxx" > hello all

But same error (517).

I have a sim card "company Orange" from spain.

Please help!!.

Thnx udelunar