I have been trying the whole day to connect my Arduino Mega2560 to the GPRS shield. Partly it works since I was able to make calls with the code provided in the wiki (seeedstudio.com/wiki/index.p … d_PWM_pins - by replacing NewSoftSerial with SoftwareSerial).
The problem is i am not able to communicate with the shield at all! I’ve read all the related posts in this forum but none of the solutions proposed worked (the only point I didn’t try is upgrading the firmware of the SIM900).
Any suggestions on how to proceed?
Thanks in advance!