HD44780 16x2 LCD won't work with my Uno
Moderators: adafruit_support_bill, adafruit

HD44780 16x2 LCD won't work with my Uno

by sharonf on Thu Mar 28, 2013 1:44 pm

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

Sharon
sharonf
 
Posts: 5
Joined: Thu Mar 28, 2013 12:51 pm

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

by adafruit_support_mike on Thu Mar 28, 2013 3:56 pm

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. ;-)
When you void a product warranty, you give up your right to sue the manufacturer if something goes wrong and accept full responsibility for whatever happens next. And then you truly own the product.
User avatar
adafruit_support_mike
 
Posts: 10768
Joined: Thu Feb 11, 2010 2:51 pm

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

by sharonf on Thu Mar 28, 2013 4:15 pm

mstone@yawp.com 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?
Attachments
20130328_194112.jpg
20130328_194112.jpg (385.95 KiB) Viewed 504 times
sharonf
 
Posts: 5
Joined: Thu Mar 28, 2013 12:51 pm

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

by adafruit_support_bill on Thu Mar 28, 2013 4:25 pm

Where did you purchase that display? It doesn't look like one of ours.
User avatar
adafruit_support_bill
 
Posts: 31711
Joined: Sat Feb 07, 2009 10:11 am

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

by sharonf on Thu Mar 28, 2013 4:37 pm

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
sharonf
 
Posts: 5
Joined: Thu Mar 28, 2013 12:51 pm

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

by adafruit_support_bill on Thu Mar 28, 2013 4:48 pm

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?
User avatar
adafruit_support_bill
 
Posts: 31711
Joined: Sat Feb 07, 2009 10:11 am

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

by sharonf on Thu Mar 28, 2013 4:51 pm

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

What do you mean by adjusting it all the way?
Attachments
20130328_224440.jpg
20130328_224440.jpg (431.67 KiB) Viewed 500 times
sharonf
 
Posts: 5
Joined: Thu Mar 28, 2013 12:51 pm

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

by sharonf on Thu Mar 28, 2013 4:54 pm

Hi,

I tried twisting the trimmer for a while in one direction and got one line to show pixels. Thanks!
sharonf
 
Posts: 5
Joined: Thu Mar 28, 2013 12:51 pm