I have a Raspberry Pi 2B and a SM900 module and I want to make a UART connect with jumpers using raspberry GPIO and the shield pins.
My problem is how could I make it? How to power up the SM900? I have a desk external energy supply, but the shield doesn't clearly identify the pins. I read that if a wrong connection is make, it damages the shield and I don't have another one to use.
My Pi uses Raspbian Jessie and I want to use Python, because in future I make a REST service with Python too.
