Interfacing Arduino with SIM800L - Serial Problem

Projects Networking, Protocols, and Devices
1

Hi

I am very new to Arduino and I am trying to connect to my SIM800L by following the below tutorial.

I have done everything exactly as per the instructions.

When I run the skript the serial prints the line "Testing GSM SIM800L" fine.
My problem is I am unable to get any response from the SIM800L when I send the "AT" command. Sometimes I get one or two triangles that's it.

The SIM800L is powered and the led is flashing one every second.

2

That tutorial doesn't look complete. Where did you find the "Test Code" mentioned in the text? Without code on the Arduino the example won't work.