I have a sim900 A6 plate like this
The seller says “interface logic voltage” = 3.3V
I will feed it separately with a 5V 2A charger
I wish to connect it to an Arduino Uno (5V).
I have various doubts:
- Is this board 5V tolerant?
- has two serial port:
- TTL serial port (U_TXD U_RXD)
- RS232 port ( R232_RX R232_TX)
Arduino connects to the first one?
What is R232 used for?
Thanks for your help
P.S. I do not know exactly how I should mention this module: is “sim900 A6” correct? Or should I say “sim900A”?