LCD not quite working

Development Boards Arduino
1

Hi,

I"ve got this basic LCD https://www.sparkfun.com/products/255

I have followed this tutorial https://learn.adafruit.com/adafruit-ard … ard-layout

The backlight switches on, but the contrast does not change when I turn the pot, nor are any characters displayed.

How do I troubleshoot this issue?

2

BTW, I also tried this particular tutorial

https://learn.sparkfun.com/tutorials/si … ing-an-lcd

and after updating the sketch, the end result is exactly the same: backlight on, no text, no response to pot adjustment. Is the LCD dead? :?

3

Is this test legit? http://www.microcontroller4beginners.co … rking.html

If so, then the LCD is malfunctioning because both top and bottom row are showing up and adjusting the pot also doesn’t change that :frowning:

4

I am guessing that you have it connected to an Arduino? What Arduino? At what voltage? Is there anything else connected to the Arduino?

5

codlink:
I am guessing that you have it connected to an Arduino? What Arduino? At what voltage? Is there anything else connected to the Arduino?

I have it connected to the 5V pin of an Arduino compatible DFRduino Uno. Nothing else is connected.