Hello! I am writing a follow up on this project. I did after all hook up my UNO and voila! the LCD display works! So it is indeed a big factor that it MUST be a 5V controller for this Display.
But from your earlier photo, you do have an UNO.
So while the UNO can't be used in the final project/product it could be used to verify if the LCD is working or not.
It would only take a few minutes to hook up the uno to the LCD and run the
"hellworld" LiquidCrystal library example sketch.
This would verify that the LCD is working.
I know this sounds strange but if I got caught using anything other than what I was given I would have gotten in trouble (alot of trouble).... I did this one the sly.
I did some research and found the NHD-C0220AA-FSW-FTW which is 3.3V and bought it. I hooked that one up to my original circuit (using the Pro-Mini) and voila again! It works like a charm on the 3.3V pro-mini.
Now, I have the display initialized (yay) and I am indeed writing an 'N' (see my code on page 1). I now have to write some more code and/or experiment with the code that is in the LiquidCrystal library.
Thank you all so much for all your help on this! I love this forum!