Hi. I have been working with an LCD and using the diagram and code from the link below. I edited the code and made it work for my computer and adding the LiquidCrystal.h library and program is compiling and uploading to my Uno. But as I turn the potentiometer from one far side to the other, not a single thing happens. Is it because I had not soldered the pin headers to the LCD even though I am making metal to metal contact with the two? Or do I have to move the potentiometer differently. THANK YOU!!