I just bought a new Arduino UNO controller and a new SIM 900 GSM shield.
My problem is, I can’t communicate with the SIM 900 via the UNO controller.
I followed this tutorial for wiring. i’m using the Software Serial jumpers and common grounds includes the TX-RX pins as I can read in the tutorial.
The shield successfully connected to the network (The Netlight LED flasing every 3 seconds).
I tried with an USB to TTL converter but nothing response from SIM900. The commands that I use are AT commands like “AT” which will responses “OK” but nothing happens. I’ve tried lots of baud rates and “Both NL & CR” option selected on the IDE Terminal.
I tried this tutorial but the results is the same as I told :/. No response from the shield.
The shield is dead or I need a firmware upgrade?
Thanks in advance!