Why try to discredit a circuit design by asking "what happens if you don't provide sufficient input voltage"?
The mistake I made
I saw your post about the way you hooked up the Optrex DMC20261 display. I have one of these and cannot make it work like all of my other displays. Could you post on how you hooked it up, what library you use, and what voltage level it needs? I can only get a backlit screen. No characters show up no matter where I turn the 1K pot. I am using the standard LiquidCrystal arduino library. I don't have this problem with my 16x2 or my 20x4 displays. I'm stumped.Thanks,Steve
QuoteWhy try to discredit a circuit design by asking "what happens if you don't provide sufficient input voltage"?Trust me when I say that no one here is important enough for me to discredit, you included. I was simply pointing our your design's limitations so that more people can use it successfully.QuoteThe mistake I madeis to think that you can design a circuit without limitations.The most successful designs are those that made the best compromises for their respective applications.
Your drawing show you grounding the center pin of the 7805. I don't think that is the proper way to wire up a 7805 as a constant current source. http://talkingelectronics.com/projects/30%20LED%20Projects/images/ConstantCurrent-2.gifLefty
Krupski,Thanks for that info. I was able to quickly verify that the display is not dead by using a 9V battery in reverse through a 10K pot. Now I cannot get any activity so I am still not out of the woods. I am using the LuquidCrystal library. Is there a special Optrex library with different parameters?Thanks for your help.