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#42
16*2 lcd not working arduino leonardo
i just bought a arduino leonardo,i just tried to run hello word sketch on it but i was not able to see any thing on the lcd. all connection was done properly .
pin used on arduino- 12,11,5,4,3,2
lcd- winstar
pls help if anyone has any idea.
Replies to This Discussion
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Permalink Reply by selvakumar on -
i am also have the same trouble...
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Permalink Reply by Jonathan Dean on -
Have you got your contrast pot hooked up? If it's hooked up correctly, you should see an effect when you turn it even if nothing is displayed. If that's working, try resetting the Arduino a time or two. If it still doesn't work, I'd suggest redoing rather than just checking your wiring. Make sure you hook up all the grounds, and make sure they have a good connection. Also, it wouldn't hurt to post a picture, schematic, or listing of your pin connections (for example, are you sure pin 11 on the Arduino is hooked to the enable pin on your LCD?).
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Permalink Reply by abhishek yadav on
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Permalink Reply by abhishek yadav on
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i tried what u suggest but i did not work , so i uploaded the image. if u find any mistake in wiring pls make me know.
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Permalink Reply by Jonathan Dean on
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Well, it looks like all of the pins go to the right places. Does the screen light up when you power it on? Do you see one line blacked out and the other not? What happens when you sweep the pot from one extreme to the other? Sometimes on my breadboard I have to wiggle the wires some to get a good connection, especially the grounds.
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Permalink Reply by abhishek yadav on
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only the back light LED glow.there is no other change in display when i sweep the port.
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Permalink Reply by Jonathan Dean on
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I just tried my LCD to see what happens. If the LCD and backlight are powered, the contrast pot doesn't do anything and the display is just blank (exactly what yours is doing). I suppose that means that the Arduino isn't communicating with it properly. Can you post your setup code? Maybe try wiring it to different pins just to see what happens (it could be that, say, the ENABLE and RS are swapped). Are the pins marked on the LCD board?
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Permalink Reply by Christine C on
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Please consider this:
http://www.johngineer.com/blog/?p=1224
[quote]For example, the lower 8 digital pins are no longer all a single port, and many of the pins, with the exception of the RX and TX lines, are moved around. Some of the PWM lines are in the same place, but are now connected to different ports and OC registers than they were before.[/quote]
which means many of the libraries will probably have to be rewritten.
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