hello guys... please I need an assistance.. am new to programming and I have an arduino uno board. I have problems with interfacing the board with GSM (sim900a) module which I wanted to use in controlling lighting I also don't know how to go about the coding. the GSM module has 2 sets of pins (6 pins in a group 3vt 3vr 5vt 5vr and 2-gnd) also ( tx rx and gnd as another set)
