I have a SIM800L module (green board). I used this to test my module.
In that page, it use a SIM800L red board with a 3.7v LiPo battery. But I directly connected 5v from the Uno to the module.
- GND >>> GND
- RX 10 >>> TX
- TX 11 >>> RX
- 5v >>> Vin
I see "Message Sent Successfully!" message in COM window but nothing happened.
I can not find the problem.
The SIM800L module (green board) specification is here.
The SIM800L module (red-green-blue boards) is here.