Problems of communication Arduino UNO R3 + GSM Shield SIM900

carlos2k6 · Post by **carlos2k6** » Thu May 02, 2013 9:37 am

I had problems to communicate my Arduino UNO R3 + GSM SIM900 Shield, the error is:
GSM Shield testing.
DB: NO RESP
DB: NO RESP
DB: NO RESP
ERROR: SIM900 does not answer. Check power and serial pins in GSM.cpp
status = IDLE

I've changed the values in the file Tx Rx GSM.cpp and nothing external power and is still not working.
Can you help with my problem?
Is there a library or some way to communicate the two shield?

Post by **techsupport** » Thu May 02, 2013 9:57 am

Hi, friend
I am sorry for provided less information.
You can follow the WIKI http://www.geeetech.com/wiki/index.php/ ... PRS_Shield .It is easy ,please read carefully.

If any problem ,please tell me.
Youes sincerely
techsupport

carlos2k6 · Post by **carlos2k6** » Sat May 04, 2013 2:52 am

Now connect the two Shield, I'm testing some AT commands, the problem right now is that I can not log into my network operator (DIGITEL VENEZUELA)

AT+CREG?
+CREG: 0,0
OK

Post by **techsupport** » Mon May 06, 2013 10:57 am

Hi ,friend
I am sorry for late reply.
I can't sure the VENEZUELA card you used is suit for the GSM Shield SIM900 .
Have a SIM card to test the GSM Shield SIM900?

Yous sincerely
techsupport

carlos2k6 · Post by **carlos2k6** » Tue May 07, 2013 1:10 pm

When I put the command AT + COPS =? I get a single network
AT+COPS=?
+COPS: (1,"movistar","movistar","73404"),,(0,1,4),(0,1,2)
OK

how to register the gsm network operators?? ( DIGITEL)
My SIM card is vendor DIGITEL...

Please help me!!!

Post by **techsupport** » Wed May 08, 2013 5:29 pm

Hi ,friend
I am so sorry for the late reply.
I analyse your problem , I think the signal of SIM900 is too weak possibly.
Do you test the signal （AT+CSQ) ？And check the connction of the antenna.
You can put the command AT + COPS ? not AT + COPS =? to check if the card connect a network operators.
Yours sincerely
techsupport

carlos2k6 · Post by **carlos2k6** » Fri May 10, 2013 4:58 am

My SIM card is from the network operator DIGITEL GSM operates in the 900MHz band, the signal level is:
AT + CSQ
+ CSQ 12.5

If my Shield GSM SIM900 is quadband, because it can not register my mobile network operator DIGITEL??

Post by **techsupport** » Fri May 10, 2013 11:21 am

Hi, friend
The signal of SIM900 is ok. But it is a big trouble that your SIM card is from the network operator DIGITEL GSM operates .I haven't too much information about the
DIGITEL GSM. I just find the http://arduino.cc/en/Main/ArduinoGSMShield It is important about the Notes on the Telefonica/Bluevia SIM included with the shield
I find VENEZUELA in these countries.

Yours sincerely
techsupport

alstonamos · Post by **alstonamos** » Mon Apr 11, 2016 1:18 pm

how to register the gsm network operators?? ( DIGITEL)

Geeetech

Problems of communication Arduino UNO R3 + GSM Shield SIM900

Problems of communication Arduino UNO R3 + GSM Shield SIM900

Re: Problems of communication Arduino UNO R3 + GSM Shield SI

Re: Problems of communication Arduino UNO R3 + GSM Shield SI

Re: Problems of communication Arduino UNO R3 + GSM Shield SI

Re: Problems of communication Arduino UNO R3 + GSM Shield SI

Re: Problems of communication Arduino UNO R3 + GSM Shield SI

Re: Problems of communication Arduino UNO R3 + GSM Shield SI

Re: Problems of communication Arduino UNO R3 + GSM Shield SI

Re: Problems of communication Arduino UNO R3 + GSM Shield SI