Have checked the cables over and over again and I find it correct.
The LCD starts and the backlight shows, but not the letters.Sometimes the white boxes flashes a millisec or so, then disappears.
I got the 10K potentiometer. And I have tried with and without it, same result.I also cant change the contrast with the potentiometer coupled on.
Ive checked the outputvoltage on it,and it works!
We really can't give more help without more information.
I've tested you sketch on my lcd+keypad shield and it worked perfectly.
Here is the video...
Here is a clearly pic of how I wired everything...
I think the potentiometer works because it gives diffrent voltage to the LCD. It also changes the contrast a liiiiiitle liiiitle bit.
QuoteHere is a clearly pic of how I wired everything...Look in the lower left box in the 'Description of Terminals' and you will see that the backlight must be supplied with no more than 4.5 Volts.This means that you must use a series resistor to drop the voltage and at the same time limit the current through tbe LED backlight.Don
To wire your LED screen to your Arduino, connect the following pins
I've recently tested to connect the backlight to the 3v pin on the arduino instead.
Could I have destoyed the backlight when I wired it to the +5V?
Unfortunately trying to get the Arduino team to change anything is worse than pulling teeth. But clearly this needs to get updated.
It appears that github is now being used for issues but I wen't ahead and put it on the google code page as well.