New LCD not working

[dkoz314]

Hi All,

I just purchased a Standard LCD 20x4, hooked it up, ran the "Hello World" example, but my world was not greeted.

The back light works and the contrast control works. I have double and triple checked my connections and everything is in place, but I get no display. Is there a easy way to check if the LCD's logic is working? I hope I don't have a defective board.

Thanks in advance!
dkoz314

[adafruit_support_bill]

The back light works and the contrast control works.

I assume that means you are getting the white rectangles on the display. Post a photo that clearly shows your wiring.

[zener]

Best bet is post a good picture of your system with the wires/connections clearly visible. It is very unlikely the display is bad. Also, try adjusting your contrast, even though you said it is fine. I had a problem once where the contrast adjustment would change depending on what I wrote to it.

[dkoz314]

Here are the images of my test setup attempting to run the "Hello World!" LCD example code.

First the wiring:


LCD with contrast high:

[dkoz314]

Yes! Got it working! I had a typo when I copied the pin assignments into the LiquidCrystal() initialization call.

[adafruit_support_bill]

Excellent! Thanks for the follow-up.