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Author Topic: Unrelenting LCD issue  (Read 540 times)
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I have a RGB LCD (16x2) hooked up to an Arduino Atmega 1280.  I can't get the LCD to display anything but solid blocks all the way.  The LCD is wired exactly like this (http://arduino.cc/en/Tutorial/LiquidCrystal).  The code I am running is the "Hello World" example, unaltered.  I have the arduino IDE (Version 1.0.3).  A 10k potentiometer is hooked up so the middle wire is running to the third pin on the LCD.  I am not sure on how to activate the backlight in multiple colors (the 15th pin is on +5V and the last three go to GND).  Much more importantly, the LCD isn't displaying data.  I thought the LCD was bad at first and got a different one.  But the same issue is occurring.  I've scanned many posts dealing with LCDs and none have solved the issue.
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After looking a couple posts down, I'm not sure if he backlight was on.  I plugged the three last pins to ground. Is that what should happen? Or hold they go to various digital pins?
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Leighton Buzzard, UK
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suggest
a) post your wiring diagram
b) read data sheet
c) compare a) with b)
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Good news! I figured it out.  I have more questions now though, but I'm going to do some research and try to figure it out before posting.
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would be good to hear what the problem and fix were
might save someone else the pain ...
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there are only 10 types of people
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