Hi everyone. Please forgive my noobness to Arduino and electronics in general. So, I have made my wife a heartshaped box for our anniversary, and I've installed the LCD 1602 on the cover. I've managed to program it fine, and wire it all up. It works beautifully from the computer. My problem is that I need to power it on battery, so it can be portable for her to take(probably to work.) When I apply battery power to the LCD, it works fine, but the text is dark and I cannot brighten it with the potentiometer. I've tried a 9v, two AA's, and 4 AA's. Can anyone offer some suggestions to brighten up these letters?
Thanks in advance