Hi guys, I am trying to send an SMS with an arduino uno and sim800l.
Pins
SIM800l - Arduino
VCC - 5v
RX- D11
TX- D10
GND - GND
I did not have antenna previously, so i bought one separately- they told me that it would be compatible with SIM800L and it fits in well as well.
The problem is that when I try to execute some commands and send SMS I simply get ERROR.
For example: AT+CMGF=1 --> ERROR
AT+CSCS? -->ERROR
AT+CMGF=? --> ERROR
When I type in AT it gives OK and I can also unlock my SIM card with PIN code, but no more.
What can be the reason of that I get ERROR of the 90% commands?
Connection problem? SIM failure? Faulty module? Antenna?
I have really no idea guys, I hope you can help me...
Thanks in advance 