Hello, I'm trying to make phone calls using a sim900 shield with an uno. It worked before but suddenly its not working now. The board powers on and I see a red light which remains solid without blinking. And I cannot connect through it with a call
On the serial monitor
DB:NO RESP
DB:NO RESP
DB:NO RESP
Trying to force the baud-rate to 9600
ERROR: SIM900 doesn't answer. Check power and serial pins in GSM.cpp
Here is the code I am using.
How can I start testing the sim900/uno to get to the bottom of what is wrong?
BTW I uploaded a blank sketch and typed AT into the Serial Monitor and saw nothing at a 4800 baud rate.