I have a newhaven display character LCD module that I am trying to get working with the basic hello world example.
The user manual can be found here:
It seems like it has a pretty standard LCD controller in it:
However, nothing shows up when I run the hello world example. I've double checked all of the connections, they're all getting voltage. The only change I have made was to plug the supply voltage into the 3.3 V line rather than the 5 V line.
I was just wondering if anyone else had encountered problems with this module, or if anything sticks out that is different with the controller.
While you do have the supply plugged into the 3.3v source, the logic level supplied to the control ports also has to be 3.3v. You'll need one of these: 74LVC245. Plug that number into your favorite supplier's site. I like DigiKey since they offer USPS for shipping.
The 74LVC245 will lower the logic voltage level from whatever board your driving the display with. (You'll want to mention that up front next time. Hopefully you'll get better responses.) The chip is bi-directional, but you can force it to operate in one direction by tying one of the pins high or low - it's in the data sheet. I'm use them with success.
For better description of how to use the 74LVC245, go to the Adafruit site - pretty good write up.