Electronics › Electronics › Problem with GSM SIM900 module
- This topic has 14 replies, 11 voices, and was last updated 6 years, 2 months ago by
Hari Prasaath K.
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July 12, 2012 at 11:57 pm #1876
Vishal
ParticipantDear Friends,
I am designing GSM based switching circuit, as I am new to this topic so before going to interface GSM module with Microcontroller I am testing with Hyper Terminal.
When I swithced ON the circuit it shows messages like ready with default setting, as below –
RDY+CFUN: 1+CPIN: READYbut this message is appearing frequently/ continuesly so I am not able to type and do other action with GSM module e.g. send messages.I can test only “AT” command and it result “OK” means GSM modem an SIM card is working fine.AATTOKOnly issue is ready messages are appering again and agian. so when I type some commands like AT+CMGF=1 suddenly above ready messages are comes in between which leads to interrupt the commands. I think GSM module is restarting.Some times “Call Ready” also appears along with above ready messages.RDY+CFUN: 1+CPIN: READYCall ReadyKindly help me out in this regards. I am in urgent need.Thanks in advanced.Regards,VishalJuly 17, 2012 at 1:46 pm #8280Amrith
ParticipantThe problem you are facing is confusing. If there is any reset switch on the module, try reseting it. Take care that, no wire is touching any of the gsm module pins.
If your problem is solved with any other solution please share, so that every one here will gain.
July 17, 2012 at 4:19 pm #8285Vishal
ParticipantDear Friends,
Above RESTART issue has been resolved.
Actually it was power supply issue, due to insufficient input current GSM module was restarting. Initially I was using regulated supply by 7805 and Zener diode, but afterwords I replaced with variable supply by LM317 and its working fine now.
Regard’s
Vishal
July 18, 2012 at 7:27 am #8286Amrith
ParticipantHey Vishal,
Appreciate!!!
Thank you for sharing.
March 5, 2013 at 8:31 pm #9252hazrat ali
Participantdear sir!
i have problem that how to switch on and off the sim900 module using send sms….i want to switch on and off the GSM MODULE by using sms when i wanted …..my project is to get data from MCU(atmega16/32) when i wanted and then switched it off or at on sleeping mood…..if anyone know about it ….plz plz reply me….
thanks
March 5, 2013 at 8:39 pm #9253hazrat ali
Participantdear friend(vishal)!
you should wait for awhile ….until CALL READY comes on hyperteminal ….then check out your commands…..also check your power supply either i give correct voltage and current to your module…
March 6, 2013 at 7:04 am #9260umar farrok
Participantin your program itself you can do it use relay to trip on only the condition is satisfies other than that the relay trip the supply off for the gsm modem try it
March 6, 2013 at 12:00 pm #9267hazrat ali
Participanti don’t want to use relly….
i want to control it by sending cammands….is this possible? can i do it with help of +CPOF,+CFUN
cammand…reply me …thanks
January 8, 2016 at 7:45 pm #13627vatsal shah
Participanthello,
i am getting msg of cpin ready and not ready..call ready msg is not getting on hyperterminal.what should i do?
January 26, 2016 at 11:04 am #13659Krushnakant Salunkhe
Participantvishal , i m facing same problem what should i do? What is power requirement for sim 900a ? I m giving power to modem by 5v adapter 1A current. Is it sufficient?? Plz reply fast
March 5, 2016 at 1:14 pm #13756Chaitanya
ParticipantHello Guys Need Ur Help .My Problem is Only AT Command is working
ATOKAT+CPIN?ERRORThis was the Problem Please Help(Need Fast Reply) THANKS IN ADVANCESeptember 1, 2016 at 4:43 pm #14126S.Sriramkumar
Participanti have a gsm 900a module…the modem is working properly because while i call the mobile which is used in the modem…i could hear a ring back sound….while i try to call it throuh the arduino….the at commands are sending…but the modem doesn't make the call…
December 3, 2016 at 7:53 pm #14255rifat499
Participantthe modem is operating properly as though I call the transportable whatever is us…
January 23, 2017 at 1:13 pm #14359Anonymous
Guesthow to fix thier problem in gsm only power led on but not status led and sim notification led is not on
January 23, 2017 at 4:37 pm #14362Hari Prasaath K
ParticipantPooventhan..
1. Have you changed the sim card and tried..
2. Check with any problem in the antenna.
3. Check with any problem in the sim card holder..
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