I have an arduino mega 2560 running on Arduino 1.0.3. The icomsat sim900 is not communicating with the board.
I have an mdb shield on ports 18 and 19 of the mega making jumping to it an issue.
According to the mega manual, I could use port 10 and 11 for the software serial. It still won't see the sim900.
Has anyone made the sim900 work with the mega 2560 without jumping wires to 18 and 19?
Kindly guide me.
Unfortunately, I made it work only with jumping wires on ports 18 and 19. Yet, I still have another problem: I am at a loss to receive SMS. If I connect the SIM to a mobile phone, the SMS's are received. If I connect it to the shield, no SMS's arrive ..... :-(