When I hook up my LCD to the arduino it just lights a blue colour but nothing that is displayed.

All connections are made according to the code below, could the problem be in the software or the hardware? Upon adjusting the pot,the brightness changes gradually but nothing that is displayed.

I have tried it on 5V pin and 3.3V pin but no observable difference except the dimming.

What could be the case here?

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closed as unclear what you're asking by per1234, VE7JRO, Juraj, sempaiscuba, Majenko Jan 11 at 17:22

Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

  • 1
    Please, post code and schematic. What LCD are you using? Specify the model. Without this information it's impossible to help you. – leoc7 Jan 11 at 8:38
  • The pot shouldn't change the brightness. It should change the contrast. When the LCD is first powered on there should be a blank line and a line filled with white squares. – Gerben Jan 11 at 15:41

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