I've got the following module of SIM900a.
My connections are:
VCC -> External 5 Volt 1.5 Amp Supply GND -> Common GND TX -> Arduino RX (Pin 0) RX -> Arduino TX (Pin 1)
I hear a ring when I call on the sim card that has inserted there. So it can register to a network successfully. I've uploaded a blank code in Arduino Uno to test
AT Commands. But I'm not getting any response when I type
AT on Serial Monitor. What am I doing wrong here?