Hi.
I have a problem with sim900. I buy in this shop online SIM900 GSM/GPRS Module - DFRobot
I try to connect to arduino Uno board. but the module not response.
I have a question.
- I use J2 (5V, GND, TX, RX, and PowerUp pin) connect to Arduino Uno board. (5V, 0,1,9 Pin). I cant find why the a module not work.
- What library can I used.
Thanks for helps