I’m using Mega2560 R3 and Seeedstudio GPRS SIM900 V1.2, but I don’t how can I do the communication with arduino. I tried to use the code from wiki, but nothing happen at serial monitor from arduino. I used the library from code.google.com/p/gsm-shield-ard … loads/list (BETA_GSM_GPRS_GPS_IDE100_v302.zip) and the communication wasn’t ok, the serial monitor print:
GSM Shield testing.
DB:NO RESP
DB:NO RESP
DB:NO RESP
ERROR: SIM900 doesn’t answer. Check power and serial pins in GSM.cpp