Quote:
Originally Posted by Nevyn
too much stray inductance or something similar, IIRC.
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Seriously? :/
Get a 3-lead 10K-ohm potentiometer. The little trimmer types should work fine. Wire one end to 5V power, the other to ground and connect the wiper to the contrast pin of the display. If you're not sure which leads are the "ends" and which is the wiper, measure the resistance between two of the leads with a multimeter. If the resistance changes when you adjust the pot, you've got an end and the wiper. Try different combinations until you find one that doesn't change (it should read about 10K-ohms).
Once you have the pot hooked up, start up the MPGuino so it's displaying some text and adjust the potentiometer to your desired contrast level.