i have the same problem but i fixed it, just use softwate serial and do not forget to type SMS service number before typing target number.. No Sim900 keep baud rate fix and does not change.
Search found 2 matches
- Sat Apr 25, 2015 5:27 pm
- Forum: Open Hardware
- Topic: Arduino GPRS Shield SIM900 not working by software
- Replies: 11
- Views: 81281
Re: Arduino GPRS Shield SIM900 not working by software
- Fri Apr 24, 2015 7:07 pm
- Forum: Open Hardware
- Topic: Arduino GPRS Shield SIM900 not working by software
- Replies: 11
- Views: 81281
Re: Arduino GPRS Shield SIM900 not working by software
i have the same problem and i fixed it :D :idea: :
the problem is the GPRS did not know the SMS service center number, to fixed it use command AT+CSCA="+964750001140" (change number with your mobile service provider), be aware this commad should type in between command AT+CMGF=1 and AT+CMGS="target ...
the problem is the GPRS did not know the SMS service center number, to fixed it use command AT+CSCA="+964750001140" (change number with your mobile service provider), be aware this commad should type in between command AT+CMGF=1 and AT+CMGS="target ...