I recently bought a SIM800L module, and am having a REALLY HARD time getting it to work. The connections to the module are as follows:
Vcc = LM2596 Buck module with source 12vDC 2Amps and output 4.0v DC.
TX = Arduino RX
RX = Arduino TX (Through a voltage divider where Output = 2.8v)
Now the SIM800L TX pin keeps on transmitting garbage values even the power supply is not connected to the SIM800 Module. When the power supply is connected, it starts to transmit even more garbage values (ASCII, Reverse Question Marks, Spades, etc).
I’ve tried all the baud rates from 9600-115200. How can I fix this?