HD44780 16x2 LCD won't work with my Uno

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sharonf
 
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HD44780 16x2 LCD won't work with my Uno

Post by sharonf »

Hi guys,

I have this HD44780 16x2 LCD and my arduino uno, im following this guide trying to wire it up with a 10k potentiometer:

http://learn.adafruit.com/character-lcd ... racter-lcd

I get the lcd backlight on but the resistor does nothing, i tried changing it with other 1K and 100K resistors and still no effect.

Help please?

Picture of the setup, sorry if its a bit messy:
Image

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adafruit_support_mike
 
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Re: HD44780 16x2 LCD won't work with my Uno

Post by adafruit_support_mike »

I'm afraid I can't load the image at the link you posted. You can put a copy on our servers with the 'Upload attachment' tab just below the editing box when you post a reply. 800x600 is usually a good size, and we like to be able to see the wiring connections for ease of troubleshooting.

Don't worry about messy.. anyone with a tidy experimental circuit is either doing it for the fifth time or lying. ;-)

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sharonf
 
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Re: HD44780 16x2 LCD won't work with my Uno

Post by sharonf »

[email protected] wrote:I'm afraid I can't load the image at the link you posted. You can put a copy on our servers with the 'Upload attachment' tab just below the editing box when you post a reply. 800x600 is usually a good size, and we like to be able to see the wiring connections for ease of troubleshooting.

Don't worry about messy.. anyone with a tidy experimental circuit is either doing it for the fifth time or lying. ;-)
hmmm.. can you see it now?
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adafruit_support_bill
 
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Re: HD44780 16x2 LCD won't work with my Uno

Post by adafruit_support_bill »

Where did you purchase that display? It doesn't look like one of ours.

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sharonf
 
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Re: HD44780 16x2 LCD won't work with my Uno

Post by sharonf »

adafruit_support wrote:Where did you purchase that display? It doesn't look like one of ours.
I bought the uno from you guys

the lcd i got from a friend who quit on electronics, along with some trimmers
but its really the same as your Standard LCD 16x2

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adafruit_support_bill
 
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Re: HD44780 16x2 LCD won't work with my Uno

Post by adafruit_support_bill »

Most are pretty compatible, but there are a few odd ones out there - including some that are designed for 3.3v.

Your wiring looks correct. That pot looks like a multi-turn type. Have you tried adjusting it over the full range?

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sharonf
 
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Re: HD44780 16x2 LCD won't work with my Uno

Post by sharonf »

And.. a picture of the lcd circuit
pretty much the same I figure

What do you mean by adjusting it all the way?
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sharonf
 
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Re: HD44780 16x2 LCD won't work with my Uno

Post by sharonf »

Hi,

I tried twisting the trimmer for a while in one direction and got one line to show pixels. Thanks!

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