I am trying to use an Arduino Power Supply Module to provide enough power to allow at least 5V and 10 mA through to an external supply. I was wondering if, using level converters/shifters, if I could connect my Pi to the module. I was having some trouble. It is my understanding that if I connect the Pi ground to any ground on the module I should be fine. The idea was that the module supplies 3.3V+G on one side of a level converter, and 5V+G on the other side, while the Pi supplies the input pins. I wanted a simple circuit that would just have a GPIO pin supply output from the Pi to a low voltage side, then the high voltage side will go to an LED, then resistor to ground.
An equivalent version of the module: https://m.media-amazon.com/images/I/71ecltR6HdL.\_AC_SL1300_.jpg
The circuit has the Pi, the Arduino Power Supply Module, and a simple design of what I wanted to build. The idea was that the Arduino Power Supply module powers both sides of a level converter. The level converter is simply a transistor and some resistors that will output voltage on 1 side if there is voltage on the other side. In this case, 3.3V from Pi allows the 5V from the power supply to go to the LED.
The Arduino Power Supply Module just allows you to have 3.3V and 5V outputs, up to (from what I could find) 700 mA based on the power supply used to power it, rather than the normal 50 mA you would get from a Pi's 3.3V line.