LCM1602C LCD + Arduino Uno R3

Other Hardware Displays
1

Hi,

I'm trying to display Hello World in my LCD 1602C using UNO R3. Not sure what's wrong but it only lits up and no text get displayed.

Picture here.
https://drive.google.com/folderview?id=0B7MoCbovR_KbfkFPVWdGS2FScVN6Ykp3c01NZWdNNDJ1RDRkZEdseExXTkN0NWpqaWEzVDg&usp=sharing

Please help.

2

Those are nicely lit and well focused photos BUT we can't unambiguously follow the data wires.

  • You are using the same color wire for four adjacent pins.
  • Two of the wires are twisted together.
  • We can't see where they go at the Arduino end.
    The real problem is that you haven't connected the contrast potentiometer to LCD pin 3. With that pin floating your display will always be blank.

If you don't have a potentiometer or a supply of resistors then try connecting LCD pin 3 to GND. The contrast will not be ideal but it may be acceptable.

Don

3

With regard to "a supply of resistors", just try single values of up to 1k8 between pin 3 and ground.

4

Thank you so much. After connecting Pin 3 with GND it worked.

5

So it should, but try it with a 220, 330, 470 and 1k ohm resistor if you have them, to see which is best.

6

I'm also trying to display Hello World with my LCD.
I used it once and it was working.
It's not a contrast problem, I have a potentiometer on pin 3.
I think the sketch is correct because it's the one from the IDE.
Can you see something wrong ?

IMG_20150427_120558.jpg
IMG_20150427_120558.jpg1536×2048 775 KB

7

Display appears faulty. Did you by any chance drop it? Was it working fully originally?

Photograph does not show power connections.

8

So it should, but try it with a 220, 330, 470 and 1k ohm resistor if you have them, to see which is best

.

I suspect that he would get one of these from his "supply of resistors".

Don

9

It was fully working when I used it for project 11 of the starter kit and I don't think I have dropped it.

10

I was going to comment on the thread hijacking but I see that there is some commonality. The photographs for both setups show four sets of twisted red wires being used for the LCD data lines. It is impossible to verify those connections

Not only do we not know the source of the power (if any) but we can't see where LCD pin 5 (R/W) is connected.

Don

11

Pull it all apart and re-wire it.

12

Is this more clear?

IMG_20150427_164756.jpg
IMG_20150427_164756.jpg1536×2048 783 KB

13

It's nice and clear but would be better if taken from further away to reduce the parallax.

Your backlight will work better if you use a much smaller resistor.

What happens when you vary the potentiometer.

Don

14

I know the backlight works better with a smaller with a smaller resistor and I usually put a 220 Ohm resistor but photos are better with this one.
When I vary the potentiometer, the display disappear. My screen is completely blue.

15

It looks like you may have a problem with the display itself. What happens when you flex the LCD module or apply pressure on the black bezel around the display glass?

Don

16

Maybe I misunderstood you, but nothing special happens when I apply pressure on the edge of the glass