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[Reply #15 on:]

Well, I wired it up just like Adafruit describes, and changed the code as shown, but same result. Just to make sure the board was working, I added into the loop() code

Code:

if (Serial.available() > 0)
  {
    byte inByte = Serial.read();
    
    if (inByte == '+')
    {
      digitalWrite(2, 1);
    }
    else if (inByte == '-')
    {
      digitalWrite(2, 0);
    }
  }

...with an LED on pin 2. Now everytime I send it + it turns on, - it goes off. So I know the board is working, and the sketch is being uploaded, but the LCD doesn't do anything. Even when I reset the board, the LCD doesn't even flash on/off, just the same 1 row of blank boxes.

Not sure what to do at this point. I'm gonna try touching up the soldering just to make sure. Thanks for everyone's help so far, BTW
.............................................................
mossen

[Reply #16 on:]

Alright, that was it......I guess there was a cold joint in there because when I stuck the LCD back into the breadboard after re-melting all the solder joints, it worked! I haven't soldered anything in about 10 years so reflecting on this problem, I should have just check the joints first. Anyway, its fixed now and I appreciate your help.

Thanks everyone, for helping me troubleshoot this!

Mossen