Re: [avr-chat] LCD corruption

[Royce Pereira]

Hello,
On Wed, 28 Sep 2005 01:46:11 +0530, Alan Kilian <address@hidden>
wrote:

> On Tue, 2005-09-27 at 22:29 +0530, Royce Pereira wrote:
> > ... the LCD gets corrupted when the valves switch on.
>
>     Royce,
>
>         I've seen a similar thing on a MiniRobominds board, and fixed it
>         by adding a "pull-to-inactive" resistor on the "E" line right at
>         the LCD. (I can't remember if it was a pullup or a pulldown).

I connected a 5k1 from E to gnd. There seems to be an improvement- no  
garbage, but the display shifts right or left randomly once in a while.  
Also funny characters briefly appear on the LCD.

I'm using my LCD in 4 bit mode- is this mode more susceptible to noise?

I think I'll try adding 10n (or less) capacitors from each of the LCD pins  
to gnd. Any comments on this would be helpful..

Thanks,
--Royce.

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