I recently bought an LCD hoping to interface it to my ARD. It is this one: http://www.sparkfun.com/commerce/product_info.php?products_id=255.
I think it might even be the same exact lcd as the one in the tutoral ( http://www.arduino.cc/en/Tutorial/LCDLibrary ) but that does not matter. The lcd driver is the same.
I downloaded the LCD library and wired up the display as indicated by the tutorial (which, based on the pinouts on my lcd, is an odd way of wiring the pins). When I upload the basic program, all I get on the lcd is a row of squares. The top row is solid with every character pixel lit and the bottom row is blank. I played with the contrast pot (50k) and it works to adjust the contrast but I cannot get anything to appear on the LCD.
Looking over the datasheet linked by the vendor I wrote some of my own code and did my best to verify it but still get the same output on the display....squares.
Can anybody point me in a direction? I can post the code I wrote if needed, but I do not think that is the problem.