Blesvin
Newbie level 6
I am connecting GSM module SIM900A with PIC microcontroller and show their response on LCD. When I send AT commands to GSM module, it does not show any response messages. I made a call to my phone through GSM module using ATD command and hang up through ATH command. But in this case also it does not show any response messages. When I made a call to GSM module, I can hear the ring but LCD does not show anything. When I use another GSM module, it works properly. What is the reason? Please help me.