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:
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HD44780 16x2 LCD won't work with my Uno
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Please be positive and constructive with your questions and comments.
- adafruit_support_mike
- Posts: 67454
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Re: HD44780 16x2 LCD won't work with my Uno
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.
Don't worry about messy.. anyone with a tidy experimental circuit is either doing it for the fifth time or lying.
- sharonf
- Posts: 7
- Joined: Thu Mar 28, 2013 12:51 pm
Re: HD44780 16x2 LCD won't work with my Uno
hmmm.. can you see it now?[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.
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- adafruit_support_bill
- Posts: 88093
- Joined: Sat Feb 07, 2009 10:11 am
Re: HD44780 16x2 LCD won't work with my Uno
Where did you purchase that display? It doesn't look like one of ours.
- sharonf
- Posts: 7
- Joined: Thu Mar 28, 2013 12:51 pm
Re: HD44780 16x2 LCD won't work with my Uno
I bought the uno from you guysadafruit_support wrote:Where did you purchase that display? It doesn't look like one of ours.
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
- adafruit_support_bill
- Posts: 88093
- Joined: Sat Feb 07, 2009 10:11 am
Re: HD44780 16x2 LCD won't work with my Uno
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?
Your wiring looks correct. That pot looks like a multi-turn type. Have you tried adjusting it over the full range?
- sharonf
- Posts: 7
- Joined: Thu Mar 28, 2013 12:51 pm
Re: HD44780 16x2 LCD won't work with my Uno
And.. a picture of the lcd circuit
pretty much the same I figure
What do you mean by adjusting it all the way?
pretty much the same I figure
What do you mean by adjusting it all the way?
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- sharonf
- Posts: 7
- Joined: Thu Mar 28, 2013 12:51 pm
Re: HD44780 16x2 LCD won't work with my Uno
Hi,
I tried twisting the trimmer for a while in one direction and got one line to show pixels. Thanks!
I tried twisting the trimmer for a while in one direction and got one line to show pixels. Thanks!
Please be positive and constructive with your questions and comments.