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[DPRG] LCD Displays and Atmels

Subject: [DPRG] LCD Displays and Atmels
From: Dean Hall dwhall256 at gmail.com
Date: Mon Oct 22 07:14:45 CDT 2007

Scott, need more info.

Vary your eye's angle to the LCD from 0-180 and see if a ghost of a  
character is there.  Some LCDs have a contrast pin that needs a bias  
voltage.  A potentiometer helps find the right voltage for your  
display.  Vcc or GND often works as the bias voltage for the LCDs  
I've used.

Is your microcontroller running at +5V?  If you're running at a lower  
voltage, you might have trouble driving the LCD's inputs.

Which Atmel are you using?  An AVR, ATmega, an 8051 equivalent or  
maybe an ARM7 or ARM9?  Atmel makes a lot of types.

What software are you running on the Atmel?  Are you using a pre-made  
library or fully self-written code?

If you can control the time delay between pin-changes (on ALL pins:  
data, E, etc), try increasing it so there's a bigger margin.


On Oct 22, 2007, at 04:10 , scott at lighthouse21.com wrote:

> Hello all,
>      I'm trying to use an LCD 1022 that I picked up from Tanners
> yesterday.  I've gotten it to initialize (turns on both lines of the
> LCD instead of just the 1 line) but I can't get any characters to
> appear on it.  Any ideas as to what to look at and/or check?
>      Thanks!
>      Scott
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