Pb with arduino GSM900 GPRS SHield

texouille
Posts: 13
Joined: Wed Jun 18, 2014 3:43 pm

Pb with arduino GSM900 GPRS SHield

Post by texouille » Wed Jun 18, 2014 3:49 pm

Hello,

i bough this item a few days ago and i already received it. That is great.

The GSM shield do not register to any network.
I did put external +5V power supply 2A.
I can communicate with the modem and send AT commands.

The sim card is OK and PIN is OK I can read info from sim card.

Antenna seems to be well connected.
When i scan the network list, i can not see any network: AT+COPS=? +COPS: ,,(0,1,4),(0,2)
AT+CREG? +CREG: 0,0
My operator allow the use of sicard for any phone on any IMEI and i did test it on several opearator with several sim card. I am currently in france. So the shield does not seems to work properly. Can you help me. I already bough this kind of shield wihout any problem in the past.

Regards,

texouille
Posts: 13
Joined: Wed Jun 18, 2014 3:43 pm

Re: Pb with arduino GSM900 GPRS SHield

Post by texouille » Wed Jun 18, 2014 6:10 pm

Of course i already tried that.

When i try to make an ATD i do have No DIal tone


Anayway the blinking led is blinking every 800 ms and not every 3 seconds, so definitely it is not registred onto the network.

As i said before, i do tested this kind of shield before without any problem.


There is no network seen onto the shield when i scan the network.

For example with another gsm card that is working properly :
AT
OK
AT+CREG?
+CREG: 0,1

OK
AT+CSQ
+CSQ: 85,99

OK
AT+COPS=?
+COPS: (2,"F BOUYGTEL",,"20820",0),
(3,"Orange F",,"20801",0),
(1,"F SFR",,"20810",0),,(0,1,3),(0,2)

OK
I can see the networks, i do have a signal strengh.

With the "faulty" card, no network is seen, as if the antennas was not working (i checked it, it is well connected, and antennas is well inserted). I did put an external power supply (5V DC, 2 A) onto the shiled, i did put the switch to EXT as it is external power supply.

But no chance, that is definitely not working. I tend to thik the unit is faulty.


Regards
Last edited by texouille on Wed Jun 18, 2014 6:24 pm, edited 1 time in total.

texouille
Posts: 13
Joined: Wed Jun 18, 2014 3:43 pm

Re: Pb with arduino GSM900 GPRS SHield

Post by texouille » Wed Jun 18, 2014 6:24 pm

just to show you the result with the "faulty" shield

RDY

+CFUN: 1

+CPIN: READY

Call Ready
AT
OK
ATD0695588888
NO CARRIER
AT+COPS=?
+COPS: ,,(0,1,4),(0,2)

OK

texouille
Posts: 13
Joined: Wed Jun 18, 2014 3:43 pm

Re: Pb with arduino GSM900 GPRS SHield

Post by texouille » Wed Jun 18, 2014 6:32 pm

my results:
RDY

+CFUN: 1

+CPIN: READY

Call Ready
AT
OK
AT+COPS=?
+COPS: ,,(0,1,4),(0,2)

OK
AT+CREG?
+CREG: 0,0

OK
CREG 0,0 means Registration in progress

in your example +CREG: 0,4 means: not registred

texouille
Posts: 13
Joined: Wed Jun 18, 2014 3:43 pm

Re: Pb with arduino GSM900 GPRS SHield

Post by texouille » Wed Jun 18, 2014 7:26 pm

yep, it seems that everything is ok, but as if the shield is not able to catch any signal, as if there was an antenna problem unable to catch the GSM radiowave.

I had a look at the antenna connector and it seem all right as well.

I do not know what i can do by now.


Regards,

texouille
Posts: 13
Joined: Wed Jun 18, 2014 3:43 pm

Re: Pb with arduino GSM900 GPRS SHield

Post by texouille » Thu Jun 19, 2014 3:51 pm

Sorry,

I lready tried that as well.
ATD0695588888;
NO DIALTONE

Regards

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