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16 x 2 LCD, screen lighting up but all I can display is black boxes

arduino shield lcd 16x2 black boxes

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#1 Aaron

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Posted 30 January 2016 - 07:28 AM

Hello, I just got this shield yesterday. I soldered the connectors on, I think I did it correctly (though it wasn't beautiful).
I put it on my Arduino and plugged it in. I ran the blink program and that works. I have no reason to believe there is anything wrong with the Arduino itself. There is a red LED that lights up on the shield when my Arduino is plugged in. The Screen also lights up. The screen displays several black boxes.

The issue I am having is that when I run the hello world program from here http://linksprite.co...ino_Sample_Code
Nothing happens.

The black boxes don't change. I press the reset button, nothing happens. I hold the reset button, nothing happens.

I've attached a picture.

Any ideas for things I could test here?

 

Thanks,
Aaron
 

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#2 igorpec

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Posted 30 January 2016 - 07:35 AM

Get a screwdriver and turn that blue potentiometer around a bit.


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#3 Aaron

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Posted 31 January 2016 - 12:27 AM

Thanks igorpec! A little twist and suddenly it's working


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Also tagged with one or more of these keywords: arduino, shield, lcd, 16x2, black boxes

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