QuoteI've recently tested to connect the backlight to the 3v pin on the arduino instead.Regardless of how you power an LED you still need some way to limit the current and this almost always involves the use of a resistor. Depending upon the LED configuration in the backlight circuit the 3 V supply may not provide enough voltage and/or current to work properly.You should power the backlight from a 5 Volt supply using a resistor in between the supply and one of the backlight pins. Unfortunately your data sheet does not supply enough information to determine the required resistance so you will have to experiment. I would start out with about 150 ohms and see if the voltage across the LED is then within specifications and if the backlight is sufficiently bright.QuoteCould I have destoyed the backlight when I wired it to the +5V?You didn't help it or the Arduino power supply at all, but you probably didn't destroy either of them (yet) either. Don
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?
... because the gudie I followed was for just the same lcd.
Is it true that the first pin to the left is my number 15 and next is 16?
Anyway, when I wired only the VSS and the VDD from the LCD to my arduino (just making sure the LCD worked) it didnt come alive, not a sign, so, I suppose it must be broken.
it didnt come alive
Ok, I got the contrast working now, I can se the bars.. But to get the volts down to 4,2 on my pin 15, I needed a 560K resistor... And when I got that volt it didnt light up.So I think my backlight must have been broken.
same as my setup
he has the same problem as me, and i have noted the stern instructions that all the wires should be soldered to the LCD ,but having looked at the videos on youtube regarding connecting UNO to LCD ,none of them are soldered ,just having wires plugged in to a breadboard and they are all working just fine !