.hello everyone. . i have a sample code of how to interface sim900a with arduino and it works properly. but how can i set a code that when a certain condition is met the gsm will send sms automatically. heres the sample code
sim900amini.ino (2.19 KB)
This is the best I can do with the limited info in your post.
Add this to your loop function:
if (Condition is met){ SendMessage(); }
Remove "Condition is met" and place your condition there, for example, "VariableX == 24"